阅读说明：本技术 一种碳/碳摩擦材料再制造方法 (Remanufacturing method of carbon/carbon friction material ) 是由 罗瑞盈 罗浩 于 2021-09-29 设计创作，主要内容包括：本发明提供一种碳/碳摩擦材料再制造方法,包括以下步骤：损伤分析：采用目视和/或探测设备确定损伤区域大小及位置；损伤区域处理：采用铣削去除损伤区域后依次采用丙酮和无水乙醇清洗并烘干；补片加工：采用切削结合铣削加工补片；粘接剂的配置：粘接剂由硼改性酚醛树脂酒精溶液,低熔点玻璃粉,铝粉,硅粉,碳化钛粉和炭纤维混合而成；胶结：将粘接剂均匀涂覆在待修复区域和补片表面；固化：采用热压机在大气环境下加热固化；碳化：将固化后的材料在高温真空炉中加热碳化；采用防氧化涂层对已修复部位及其所在的碳/碳摩擦材料的非摩擦面进行防氧化处理；检验检测：对再制造后的目标零件进行检验。(The invention provides a remanufacturing method of a carbon/carbon friction material, which comprises the following steps: and (3) analyzing damage: determining the size and position of the damaged area by adopting visual and/or detection equipment; and (3) treating a damaged area: removing the damaged area by milling, sequentially cleaning with acetone and absolute ethyl alcohol, and drying; patch processing: machining a patch by cutting and milling; adhesive preparation: the adhesive is formed by mixing boron modified phenolic resin alcoholic solution, low-melting-point glass powder, aluminum powder, silicon powder, titanium carbide powder and carbon fiber; and (3) cementing: uniformly coating the adhesive on the area to be repaired and the surface of the patch; and (3) curing: heating and curing in an atmospheric environment by adopting a hot press; carbonizing: heating and carbonizing the cured material in a high-temperature vacuum furnace; carrying out anti-oxidation treatment on the repaired part and the non-friction surface of the carbon/carbon friction material on which the repaired part is positioned by adopting an anti-oxidation coating; and (3) checking and detecting: and inspecting the remanufactured target part.)

1. A method of remanufacturing a carbon/carbon friction material, comprising: the method comprises the following steps of damage analysis, damaged area treatment, patch processing, adhesive preparation, cementing, curing, carbonization and anti-oxidation treatment, and comprises the following steps:

(1) damage analysis

Directly adopting visual and/or detection equipment to comprehensively check, analyze and judge the damage size and position of the carbon/carbon friction material to be repaired to obtain a damaged area;

(2) treatment of damaged areas

Removing the surface of the damaged area checked in the step (1) by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and absolute ethyl alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃;

(3) patch processing

Machining a carbon/carbon friction material patch with the same size as the area to be repaired by adopting a cutting and milling machining mode;

(4) arrangement of the adhesive

At room temperature, sequentially putting 25-30wt.% of low-melting-point glass powder, 10-15wt.% of aluminum powder, 10-15wt.% of silicon powder, 20-25wt.% of titanium carbide powder and 0.4-0.7 wt.% of short carbon fibers into a ball mill for ball milling for 2 hours to prepare a solid mixture, then stirring and mixing boron modified phenolic resin and absolute ethyl alcohol to prepare a boron modified phenolic resin alcohol solution with the viscosity of 65-100cps, and finally simultaneously adding the 25-30wt.% boron modified phenolic resin alcohol solution and the solid mixture into a beaker for mechanical stirring for 1 hour to complete the preparation of the adhesive;

(5) cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the carbon/carbon friction material patch obtained in the step (3) by using a scraper; attaching the carbon/carbon friction material patch to the area to be repaired, putting the carbon/carbon friction material patch into a hot press, controlling the thickness of a glue layer to be 0.08-0.30 um by controlling the pressure applied on the material by the hot press, and finally naturally drying for 20 hours to obtain a semi-finished cementing product;

(6) curing

Heating the cemented semi-finished product to 160 ℃ by adopting a hot press under an atmospheric environment according to a curing heating curve to cure the cemented semi-finished product to obtain a cured semi-finished product;

(7) carbonizing

Putting the cured semi-finished product into a high-temperature vacuum furnace, heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa, and preserving heat for 30 minutes to obtain a carbonized semi-finished product;

(8) and coating an anti-oxidation coating on the carbonized semi-finished product to finish remanufacturing of the C/C friction material.

2. A method of remanufacturing a carbon/carbon friction material according to claim 1, wherein: in the step (2), the ultrasonic power of ultrasonic cleaning of the acetone and the alcohol is 160-200W, and the ultrasonic time is 2 hours respectively.

3. A method of remanufacturing a carbon/carbon friction material according to claim 1, wherein: and (3) reserving a glue layer thickness allowance of 0.08-0.30 um on the surface of the patch attached to the area to be repaired.

4. A method of remanufacturing a carbon/carbon friction material according to any one of claims 1, 2 and 3, wherein: in the step (4), the mesh number of the low-melting-point glass powder is 1500-3000 meshes, and the melting point is 700-; the granularity of the aluminum powder is 200-325 meshes; the granularity of the silicon powder is 200-325 meshes; the granularity of the titanium carbide powder is 200-325 meshes; the length of the short fiber is 6-10 mm; the purity of the absolute ethyl alcohol is analytically pure;

in the step (4), the ball milling parameters are set as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times;

the mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

5. A method of remanufacturing a carbon/carbon friction material according to claim 4, wherein: in the step (6), the curing and heating process comprises the following steps:

a first temperature rise stage at 25-80 ℃ for 60 minutes;

the second heat preservation stage, at 80 ℃, for 60 minutes;

the third temperature rise stage, at 80-120 ℃, for 30 minutes;

a fourth heat preservation stage at 120 ℃ for 240 minutes;

a fifth temperature rise stage at 120-160 ℃ for 30 minutes;

a sixth heat preservation stage at 160 ℃ for 270 minutes;

a seventh cooling stage, wherein the temperature is freely reduced at 160-25 ℃;

and (4) continuously applying pressure to the hot press during the curing period of the step (6).

6. A method of remanufacturing a carbon/carbon friction material according to any one of claims 1, 2, 3 and 5, wherein: in the step (7), the carbonization process comprises the following steps:

a first temperature rise stage at 25-400 ℃ for 240 minutes;

a second temperature rise stage, wherein the temperature is 400-700 ℃ and the time is 120 minutes;

a third temperature rise stage, wherein the temperature is 700-1000 ℃ and 100 minutes;

a fourth heat preservation stage, at 1000 ℃ for 30 minutes;

and in the fifth cooling stage, the temperature is freely reduced at 1000-25 ℃.

7. A method of remanufacturing a carbon/carbon friction material according to claim 6, wherein: in the step (8), the coating part of the anti-oxidation coating is the repaired part of the carbon/carbon friction material to be repaired and the non-friction surface of the carbon/carbon friction material corresponding to the repaired part.

8. A method of remanufacturing a carbon/carbon friction material according to claim 1 or 7, wherein: after the step (8), the step (9) of detection is required;

and (9) detecting and detecting the shear strength at room temperature, the heat resistance and the thermal shock resistance.

9. A preparation method of a bonding agent for a carbon/carbon friction material remanufacturing method is characterized by comprising the following steps: the method comprises the following steps:

at room temperature, firstly putting 25-30wt.% of low-melting-point glass powder, 10-15wt.% of aluminum powder, 10-15wt.% of silicon powder, 20-25wt.% of titanium carbide powder and 0.4-0.7 wt.% of chopped carbon fiber into a ball mill for ball milling for 2 hours to prepare a solid mixture;

then stirring and mixing the boron modified phenolic resin and absolute ethyl alcohol to prepare a boron modified phenolic resin alcohol solution with the viscosity of 65-100cps, and finally adding 25-30wt.% of the boron modified phenolic resin alcohol solution and the solid mixture into a beaker to mechanically stir for 1 hour to complete the preparation of the adhesive;

wherein the low melting point glass powder has a mesh number of 1500-3000 meshes and a melting point of 700-750 ℃; the granularity of the aluminum powder is 200-325 meshes; the granularity of the silicon powder is 200-325 meshes; the granularity of the titanium carbide powder is 200-325 meshes; the length of the short fiber is 6-10 mm; the purity of the absolute ethyl alcohol is analytically pure;

the ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times;

the mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

10. An adhesive prepared by the process of making an adhesive of claim 9.

Technical Field

The invention provides a remanufacturing method of a carbon/carbon friction material, belonging to the technical field of carbon/carbon composite materials.

Background

The carbon/carbon composite material has the advantages of low density, large heat capacity, stable high-temperature performance and the like, is an advanced friction material, and is widely applied to brake systems of airplanes, engineering racing cars and the like. Meanwhile, the carbon/carbon composite material is a material with high cost, high technical content and high added value. Therefore, the new material which cannot be used due to the damages such as surface fuzzing, scratches, pits, chipping and the like or the old material which reaches the service life is remanufactured, so that the performance and the service life of the new material are the same as those of the new material, and the use cost of the carbon/carbon friction material can be greatly reduced. The key point for realizing remanufacture of the carbon/carbon friction material is repairing of a damaged area, and because the carbon/carbon material cannot be welded, one of the existing methods for repairing the carbon/carbon friction material is to fix and repair bolts made of refractory metal or carbon/carbon composite material, but the method has complex process, easily generates stress concentration, increases the structural weight and causes the reduction of reliability and effective load. The adhesive bonding is used as a technology for connecting the surfaces of homogeneous or heterogeneous objects together, has the characteristics of continuous stress distribution, light weight and the like, and is a very effective carbon/carbon material repairing method.

The binders for carbon/carbon materials developed so far are mainly classified into organic and inorganic ones. The organic adhesive forms a carbon bonding layer or a silicon bonding layer after high-temperature heat treatment, has higher bonding strength at room temperature, but has certain limitation, low fracture toughness and poor thermal shock resistance due to the single-phase structure. The inorganic adhesive can react with a C/C matrix to form a carbide bonding layer with high bonding strength, and the carbide bonding layer has excellent temperature resistance, but the thermal expansion coefficient and the elastic modulus between the ceramic layer and the C/C composite material are greatly mismatched, so that residual stress can be generated in the cooling process of the preparation temperature, and the bonding strength is reduced. Therefore, the core of realizing remanufacturing technology of carbon/carbon friction materials is the development of an adhesive having excellent repair performance.

Disclosure of Invention

The invention aims to solve the defects of the prior art, and provides a method for remanufacturing a carbon/carbon friction material, wherein the carbon/carbon friction material remanufactured by the method can achieve the same performance and service life as a new material, has high shear strength within the range of room temperature to 1500 ℃, and still has high shear strength after 50 times of thermal cycle at 1300 ℃.

The invention also aims to provide a preparation method of the adhesive for the remanufacturing method of the carbon/carbon friction material.

The invention also aims to provide the adhesive prepared by the adhesive preparation method.

A remanufacturing method of a carbon/carbon friction material comprises the steps of damage analysis, damaged area treatment, patch processing, adhesive preparation, cementation, curing, carbonization and anti-oxidation treatment, and comprises the following steps:

(1) damage analysis

Directly adopting visual and/or detection equipment to comprehensively check, analyze and judge the damage size and position of the carbon/carbon friction material to be repaired to obtain a damaged area;

(2) treatment of damaged areas

Removing the surface of the damaged area checked in the step (1) by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and absolute ethyl alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃;

(3) patch processing

Machining a carbon/carbon friction material patch with the same size as the area to be repaired by adopting a cutting and milling machining mode;

(4) arrangement of the adhesive

At room temperature, sequentially putting 25-30wt.% of low-melting-point glass powder, 10-15wt.% of aluminum powder, 10-15wt.% of silicon powder, 20-25wt.% of titanium carbide powder and 0.4-0.7 wt.% of short carbon fibers into a ball mill for ball milling for 2 hours to prepare a solid mixture, then stirring and mixing boron modified phenolic resin and absolute ethyl alcohol to prepare a boron modified phenolic resin alcohol solution with the viscosity of 65-100cps, and finally simultaneously adding the 25-30wt.% boron modified phenolic resin alcohol solution and the solid mixture into a beaker for mechanical stirring for 1 hour to complete the preparation of the adhesive;

(5) cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the carbon/carbon friction material patch obtained in the step (3) by using a scraper; attaching the carbon/carbon friction material patch to the area to be repaired, putting the carbon/carbon friction material patch into a hot press, controlling the thickness of a glue layer to be 0.08-0.30 um by controlling the pressure applied by the hot press on the carbon/carbon friction material to be repaired, which is bonded with the carbon/carbon friction material patch, and finally naturally drying for 20 hours to obtain a semi-finished cementing product;

(6) curing

Heating the cemented semi-finished product to 160 ℃ by adopting a hot press under an atmospheric environment according to a curing heating curve to cure the cemented semi-finished product to obtain a cured semi-finished product;

(7) carbonizing

Putting the cured semi-finished product into a high-temperature vacuum furnace, heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa, and preserving heat for 30 minutes to obtain a carbonized semi-finished product;

(8) and coating an anti-oxidation coating on the carbonized semi-finished product to finish remanufacturing of the C/C friction material.

In the step (2), the ultrasonic power of ultrasonic cleaning of the acetone and the alcohol is 160-200W, and the ultrasonic time is 2 hours respectively.

And (3) reserving a glue layer thickness allowance of 0.08-0.30 um on the surface of the patch attached to the area to be repaired.

In the step (4), the mesh number of the low-melting-point glass powder is 1500-3000 meshes, and the melting point is 700-; the granularity of the aluminum powder is 200-325 meshes; the granularity of the silicon powder is 200-325 meshes; the granularity of the titanium carbide powder is 200-325 meshes; the length of the short fiber is 6-10 mm; the purity of the absolute ethyl alcohol is analytically pure;

in the step (4), the ball milling parameters are set as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times;

the mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

In the step (6), the curing and heating process comprises the following steps:

a first temperature rise stage at 25-80 ℃ for 60 minutes;

the second heat preservation stage, at 80 ℃, for 60 minutes;

the third temperature rise stage, at 80-120 ℃, for 30 minutes;

a fourth heat preservation stage at 120 ℃ for 240 minutes;

a fifth temperature rise stage at 120-160 ℃ for 30 minutes;

a sixth heat preservation stage at 160 ℃ for 270 minutes;

a seventh cooling stage, wherein the temperature is freely reduced at 160-25 ℃;

and (4) continuously applying pressure to the hot press during the curing period of the step (6).

In the step (7), the carbonization process comprises the following steps:

a first temperature rise stage at 25-400 ℃ for 240 minutes;

a second temperature rise stage, at 400-700 ℃ for 120 minutes;

a third temperature rise stage, 700-1000 ℃, 100 minutes;

a fourth heat preservation stage, at 1000 ℃ for 30 minutes;

and in the fifth cooling stage, the temperature is freely reduced at 1000-25 ℃.

In the step (8), the coating part of the anti-oxidation coating is the repaired part of the carbon/carbon friction material to be repaired and the non-friction surface of the carbon/carbon friction material corresponding to the repaired part.

After the step (8), the step (9) of detection is required;

and (9) detecting and detecting the shear strength at room temperature, the heat resistance and the thermal shock resistance.

A preparation method of a binder for a remanufacturing method of a carbon/carbon friction material comprises the following steps:

at room temperature, firstly putting 25-30wt.% of low-melting-point glass powder, 10-15wt.% of aluminum powder, 10-15wt.% of silicon powder, 20-25wt.% of titanium carbide powder and 0.4-0.7 wt.% of chopped carbon fiber into a ball mill for ball milling for 2 hours to prepare a solid mixture;

then stirring and mixing the boron modified phenolic resin and absolute ethyl alcohol to prepare a boron modified phenolic resin alcohol solution with the viscosity of 65-100cps, and finally adding 25-30wt.% of the boron modified phenolic resin alcohol solution and the solid mixture into a beaker to mechanically stir for 1 hour to complete the preparation of the adhesive;

wherein the low melting point glass powder has a mesh number of 1500-3000 meshes and a melting point of 700-750 ℃; the granularity of the aluminum powder is 200-325 meshes; the granularity of the silicon powder is 200-325 meshes; the granularity of the titanium carbide powder is 200-325 meshes; the length of the short fiber is 6-10 mm; the purity of the absolute ethyl alcohol is analytically pure;

the ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times;

the mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

An adhesive prepared by the method of preparing an adhesive according to the above method.

The invention has the advantages and positive effects that: the preparation cost is low, the remanufactured carbon/carbon friction material can achieve the same performance and service life (the service temperature is room temperature-1100 ℃) as the new material, and the remanufactured carbon/carbon friction material has high shear strength within the range of room temperature to 1500 ℃, and still has high shear strength after 50 times of thermal cycle at 1300 ℃.

Drawings

FIG. 1 is a flow chart of the remanufacturing of a carbon/carbon friction material of the present invention;

FIG. 2 is a flow chart of the adhesive preparation of the present invention;

FIG. 3 is a graph of a curing process of the present invention;

FIG. 4 is a graph of a carbonization process of the present invention;

FIG. 5 is a sample end SEM of a repaired carbon/carbon friction material;

fig. 6 is a microscopic SEM image of the adhesive of the present invention after partial magnification.

Detailed Description

In fig. 1, the present invention provides an advanced carbon/carbon friction material remanufacturing technology, which comprises eight parts: the method comprises the following steps of damage analysis, damaged area treatment, adhesive preparation, cementing, curing, carbonization, anti-oxidation treatment and inspection detection, and specifically comprises the following steps:

(1) damage analysis

Whether the material contour is complete and the edges and corners are clear is directly checked visually, and the damage size and the damage position of the carbon/carbon friction material c to be repaired can be analyzed and judged by combining detection equipment such as X rays or using the detection equipment alone to carry out comprehensive inspection to obtain a damage area.

(2) Treatment of damaged areas

Firstly, removing the surface of a damaged area by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃. Wherein the ultrasonic power is 160-200W, and the ultrasonic time is 2 hours respectively.

(3) Patch processing

Processing a carbon/carbon friction material patch a with the same size as the area to be repaired by adopting a cutting and milling processing mode, and reserving a glue layer thickness allowance of 0.08-0.30 um on the surface of the patch attached to the area to be repaired;

(4) arrangement of the adhesive

(5) Cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the patch obtained in the step (3) by using a scraper, attaching the carbon/carbon friction material patch a to the area to be repaired, putting the attached carbon/carbon friction material patch a into a hot press, controlling the total thickness of the material after the carbon/carbon friction material patch a is attached by controlling the pressure of the hot press, further controlling the thickness of the adhesive layer b to be between 0.08 and 0.30um, and finally naturally drying for 20 hours to obtain a semi-finished adhesive product; the control of the thickness of the adhesive layer at 0.08-0.30 um is the optimized result, the bonding strength is highest at the moment, the thickness of the adhesive layer is too thin when the thickness of the adhesive layer is less than 0.08um, the bonding effect cannot be fully exerted, and the defects of cracks, holes and the like which reduce the bonding strength are easy to appear in the adhesive layer when the thickness of the adhesive layer is more than 0.30 um.

(6) Curing

And (3) heating to 160 ℃ according to a curing heating curve under an atmospheric environment by adopting a hot press to cure the material, continuously applying pressure during curing, and keeping the thickness of the bonding layer unchanged.

(7) Carbonizing

And (3) putting the cured material into a high-temperature vacuum furnace, and heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa and preserving the heat for 30 minutes.

(8) And (3) carrying out anti-oxidation treatment on the repaired part and the non-friction surface of the carbon/carbon friction material on which the repaired part is positioned by adopting an anti-oxidation coating to complete remanufacturing of the C/C friction material.

(9) Test detection

And (5) inspecting the remanufactured target part to see whether the technical requirements are met.

In fig. 2, the configuration process of the adhesive specifically includes: at room temperature, firstly, 25-30wt.% of low-melting-point glass powder, 10-15wt.% of aluminum powder, 10-15wt.% of silicon powder, 20-25wt.% of titanium carbide powder and 0.4-0.7 wt.% of short carbon fibers are put into a ball mill to be ball-milled for 2 hours to prepare a solid mixture, then boron modified phenolic resin and absolute ethyl alcohol are stirred and mixed to prepare boron modified phenolic resin absolute ethyl alcohol solution with the viscosity of 65-100cps, and finally, 25-30wt.% of boron modified phenolic resin absolute ethyl alcohol solution and the solid mixture are simultaneously added into a beaker to be mechanically stirred for 1 hour, so that the preparation of the adhesive is completed. Wherein the low melting point glass powder has a mesh number of 1500-3000 meshes and a melting point of 700-750 ℃; the granularity of the aluminum powder is 200-325 meshes; the granularity of the silicon powder is 200-325 meshes; the granularity of the titanium carbide powder is 200-325 meshes; the length of the short fiber is 6-10 mm; the purity of the absolute ethanol is analytically pure.

The ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times. The mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

In fig. 3, the curing and temperature raising process includes:

a first temperature rise stage at 25-80 ℃ for 60 minutes;

the second heat preservation stage, at 80 ℃, for 60 minutes;

the third temperature rise stage, at 80-120 ℃, for 30 minutes;

a fourth heat preservation stage at 120 ℃ for 240 minutes;

a fifth temperature rise stage at 120-160 ℃ for 30 minutes;

a sixth heat preservation stage at 160 ℃ for 270 minutes;

and (3) in a seventh cooling stage, wherein the temperature is between 160 and 25 ℃, the temperature is freely reduced, and the hot press needs to continuously apply pressure during the curing period in the step (6).

In fig. 4, the carbonization process comprises:

a first temperature rise stage at 25-400 ℃ for 240 minutes;

a second temperature rise stage, at 400-700 ℃ for 120 minutes;

a third temperature rise stage, 700-1000 ℃, 100 minutes;

a fourth heat preservation stage, at 1000 ℃ for 30 minutes;

and in the fifth cooling stage, the temperature is freely reduced at 1000-25 ℃.

And (9) detecting and detecting the shear strength at room temperature, the heat resistance and the thermal shock resistance.

Room temperature shear strength: the test method is characterized in that the test method is obtained by adopting a short beam method on a universal electronic testing machine;

and (3) detecting heat resistance: putting the remanufactured carbon/carbon friction material into a tube furnace, preserving heat for 50 hours at test temperature points (300 ℃, 500 ℃, 700 ℃, 900 ℃ and 1100 ℃ respectively) under the argon protective atmosphere, and then cooling the material to room temperature for testing the layer shear performance;

thermal shock resistance: freely heating the tube furnace to a testing temperature point (900 ℃, 1000 ℃ and 1100 ℃), then placing the remanufactured carbon/carbon friction material into the furnace for heat preservation for 10 minutes, then cooling the remanufactured carbon/carbon friction material to room temperature, sequentially circulating for 100 times, 100 times and 100 times at different temperatures, and finally carrying out a layer shear performance test. Table 1 shows the results of the performance test of the remanufactured carbon/carbon friction material, and it can be known from the table that the remanufactured carbon/carbon friction material can achieve the same performance and service life as the new material.

FIG. 5 is a sample end SEM of a repaired carbon/carbon friction material; in the figure, a is a carbon/carbon friction material patch, b is a glue layer, and c is a carbon/carbon friction material to be repaired.

Fig. 6 is a microscopic SEM image of the adhesive of the present invention after partial magnification.

The present invention will be further described with reference to the following examples.

Example 1

(1) Damage analysis

And (3) directly adopting visual and detection equipment to comprehensively check the carbon/carbon friction material to be repaired, and analyzing and judging the damage size and position of the carbon/carbon friction material.

(2) Treatment of damaged areas

Firstly, removing the surface of a damaged area by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃. Wherein the ultrasonic power is 160W, and the ultrasonic time is 2 hours.

(3) Patch processing

Processing a carbon/carbon friction material patch with the same size as the area to be repaired by adopting a cutting and milling processing mode, and reserving a glue layer thickness allowance of 0.08um on the surface of the patch attached to the area to be repaired;

(4) arrangement of the adhesive

At room temperature, firstly, 25wt.% of low-melting-point glass powder, 10 wt.% of aluminum powder, 15wt.% of silicon powder, 20 wt.% of titanium carbide powder and 0.5 wt.% of short carbon fibers are put into a ball mill to be ball-milled for 2 hours to prepare a solid mixture, then boron modified phenolic resin is stirred and mixed with a proper amount of absolute ethyl alcohol to prepare a boron modified phenolic resin alcohol solution with the viscosity of 65cps, and finally 29.5 wt.% of the boron modified phenolic resin alcohol solution is added into a beaker together with the solid mixture to be mechanically stirred for 1 hour, so that the preparation of the adhesive is completed. Wherein the mesh number of the low-melting-point glass powder is 1500 meshes, and the melting point is 700-750 ℃; the granularity of the aluminum powder is 325 meshes; the granularity of the silicon powder is 325 meshes; the granularity of the titanium carbide powder is 325 meshes; the length of the chopped fiber is 6 mm; the purity of the absolute ethanol is analytically pure.

The ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times.

The mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

(5) Cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the carbon/carbon friction material patch obtained in the step (3) by using a scraper; and (3) attaching the carbon/carbon friction material patch with the area to be repaired, putting the carbon/carbon friction material patch into a hot press, controlling the thickness of the adhesive layer to be 0.08um by controlling the pressure of the hot press, and finally naturally drying for 20 hours.

(6) Curing

And (3) heating to 160 ℃ according to a curing heating curve under an atmospheric environment by adopting a hot press to cure the material, continuously applying pressure during curing, and keeping the thickness of the bonding layer unchanged.

(7) Carbonizing

And (3) putting the cured material into a high-temperature vacuum furnace, and heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa and preserving the heat for 30 minutes.

(8) And carrying out anti-oxidation treatment on the repaired part and the non-friction surface of the carbon/carbon friction material on which the repaired part is positioned by adopting an anti-oxidation coating.

(9) Test detection

And (5) inspecting the remanufactured target part to see whether the technical requirements are met.

Example 2

(1) Damage analysis

And directly and visually carrying out comprehensive inspection on the carbon/carbon friction material to be repaired, and analyzing and judging the damage size and position of the carbon/carbon friction material.

(2) Treatment of damaged areas

Firstly, removing the surface of a damaged area by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃. Wherein the ultrasonic power is 160W, and the ultrasonic time is 2 hours.

(3) Patch processing

Processing a carbon/carbon friction material patch with the same size as the area to be repaired by adopting a cutting and milling processing mode, and reserving a glue layer thickness allowance of 0.19um on the surface of the patch attached to the area to be repaired;

(4) arrangement of the adhesive

At room temperature, firstly, 25wt.% of low-melting-point glass powder, 15wt.% of aluminum powder, 10 wt.% of silicon powder, 20 wt.% of titanium carbide powder and 0.7 wt.% of short carbon fibers are put into a ball mill to be ball-milled for 2 hours to prepare a solid mixture, then boron modified phenolic resin and a proper amount of absolute ethyl alcohol are stirred and mixed to prepare boron modified phenolic resin alcohol solution with the viscosity of 70cps, and finally 29.3 wt.% of boron modified phenolic resin alcohol solution is added into a beaker to be mechanically stirred for 1 hour while the solid mixture is mixed, so that the preparation of the adhesive is completed. Wherein the mesh number of the low-melting-point glass powder is 1500 meshes, and the melting point is 700-750 ℃; the granularity of the aluminum powder is 325 meshes; the granularity of the silicon powder is 325 meshes; the granularity of the titanium carbide powder is 325 meshes; the length of the chopped fiber is 6 mm; the purity of the absolute ethanol is analytically pure.

The ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times.

The mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

(5) Cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the carbon/carbon friction material patch obtained in the step (3) by using a scraper; and (3) attaching the carbon/carbon friction material patch with the area to be repaired, putting the carbon/carbon friction material patch into a hot press, controlling the thickness of the adhesive layer to be 0.19um by controlling the pressure of the hot press, and finally naturally drying for 20 hours.

(6) Curing

And (3) heating to 160 ℃ according to a curing heating curve under an atmospheric environment by adopting a hot press to cure the material, continuously applying pressure during curing, and keeping the thickness of the bonding layer unchanged.

(7) Carbonizing

And (3) putting the cured material into a high-temperature vacuum furnace, and heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa and preserving the heat for 30 minutes.

(8) And carrying out anti-oxidation treatment on the repaired part and the non-friction surface of the carbon/carbon friction material on which the repaired part is positioned by adopting an anti-oxidation coating.

(9) Test detection

And (5) inspecting the remanufactured target part to see whether the technical requirements are met.

Example 3

(1) Damage analysis

And (3) directly adopting detection equipment to comprehensively check the carbon/carbon friction material to be repaired, and analyzing and judging the damage size and position of the carbon/carbon friction material.

(2) Treatment of damaged areas

Firstly, removing the surface of a damaged area by adopting a milling machining mode to obtain an area to be repaired, then ultrasonically cleaning the surface of the area to be repaired by adopting acetone and alcohol in sequence, drying, and finally drying for 2 hours in an atmospheric environment at 120 ℃. Wherein the ultrasonic power is 160W, and the ultrasonic time is 2 hours.

(3) Patch processing

Processing a carbon/carbon friction material patch with the same size as the area to be repaired by adopting a cutting and milling processing mode, and reserving a glue layer thickness allowance of 0.30um on the surface of the patch attached to the area to be repaired;

(4) arrangement of the adhesive

At room temperature, firstly, 30wt.% of low-melting-point glass powder, 10 wt.% of aluminum powder, 10 wt.% of silicon powder, 20 wt.% of titanium carbide powder and 0.5 wt.% of short carbon fibers are put into a ball mill to be ball-milled for 2 hours to prepare a solid mixture, then boron modified phenolic resin and a proper amount of absolute ethyl alcohol are stirred and mixed to prepare boron modified phenolic resin alcohol solution with the viscosity of 100cps, and finally 29.5 wt.% of boron modified phenolic resin alcohol solution is added into a beaker to be mechanically stirred for 1 hour while the solid mixture is mixed, so that the preparation of the adhesive is completed. Wherein the mesh number of the low-melting-point glass powder is 1500 meshes, and the melting point is 700-750 ℃; the granularity of the aluminum powder is 325 meshes; the granularity of the silicon powder is 325 meshes; the granularity of the titanium carbide powder is 325 meshes; the length of the chopped fiber is 7 mm; the purity of the absolute ethanol is analytically pure.

The ball milling parameters are as follows: the ball material ratio is 3: 1; the number ratio of large, medium and small grinding balls is 1:3: 6; the rotating speed is 200 r/min, the ball milling direction is changed once every 30min of ball milling, and the whole process is circulated for 4 times.

The mechanical stirring parameters are set as follows: the rotation speed is 200 rpm.

(5) Cementing

Uniformly coating the adhesive prepared in the step (4) on the surface of the area to be repaired obtained in the step (2) and the surface of the carbon/carbon friction material patch obtained in the step (3) by using a scraper; and (3) attaching the carbon/carbon friction material patch with the area to be repaired, putting the carbon/carbon friction material patch into a hot press, controlling the thickness of the adhesive layer to be 0.30um by controlling the pressure of the hot press, and finally naturally drying for 20 hours.

(6) Curing

And (3) heating to 160 ℃ according to a curing heating curve under an atmospheric environment by adopting a hot press to cure the material, continuously applying pressure during curing, and keeping the thickness of the bonding layer unchanged.

(7) Carbonizing

And (3) putting the cured material into a high-temperature vacuum furnace, and heating to 1000 ℃ according to a carbonization curve under a vacuum environment of-0.1 MPa and preserving the heat for 30 minutes.

(8) And carrying out anti-oxidation treatment on the repaired part and the non-friction surface of the carbon/carbon friction material on which the repaired part is positioned by adopting an anti-oxidation coating.

(9) Test detection

And (5) inspecting the remanufactured target part to see whether the technical requirements are met.