阅读说明：本技术 一种碳碳预制体及其制备方法 (Carbon-carbon preform and preparation method thereof ) 是由 孙正涛 李海成 周国平 于 2019-09-12 设计创作，主要内容包括：本发明实提供了一种碳碳预制体及其制备方法,包括：基于缓冲层,将第一碳布层、连续纤维层和第一网胎层之间固定连接,得到间断层；基于间断层,将多层第二碳布层和多层第二网胎层之间固定连接,得到连续层；将多层间断层和多层连续层固定在缓冲层的表面；去除缓冲层,得到碳碳预制体；其中,第一碳布层与缓冲层接触,一层连续层设置在相邻两层间断层之间,且连续层中的第二碳布层与间断层中的第一网胎层接触。本发明中,通过将多层间断层和连续层交替设置在模具上的缓冲层上,从而制备得到碳碳预制体,减少了碳纤维布和碳纤维网胎的接头,提高了碳碳预制体的力学性能,同时,使连续层中的张紧力得到释放,进一步提高了碳碳预制体的力学性能。(The invention provides a carbon-carbon preform and a preparation method thereof, wherein the preparation method comprises the following steps: fixedly connecting the first carbon cloth layer, the continuous fiber layer and the first net tire layer based on the buffer layer to obtain an interrupted layer; fixedly connecting the plurality of second carbon cloth layers and the plurality of second net tire layers based on the discontinuous layers to obtain continuous layers; fixing the multiple discontinuous layers and the multiple continuous layers on the surface of the buffer layer; removing the buffer layer to obtain a carbon-carbon prefabricated body; wherein, first carbon cloth layer contacts with the buffer layer, and one deck continuous layer sets up between two adjacent discontinuous layers, and the second carbon cloth layer in the continuous layer contacts with the first net child layer in the discontinuous layer. According to the invention, the carbon-carbon preform is prepared by alternately arranging the plurality of discontinuous layers and the continuous layers on the buffer layer on the mold, so that the joints of the carbon fiber cloth and the carbon fiber net tire are reduced, the mechanical property of the carbon-carbon preform is improved, meanwhile, the tension in the continuous layers is released, and the mechanical property of the carbon-carbon preform is further improved.)

1. A method of making a carbon-carbon preform, the method comprising:

arranging a buffer layer on the surface of the mould;

fixedly connecting the first carbon cloth layer, the continuous fiber layer and the first net tire layer based on the buffer layer to obtain an interrupted layer; the continuous fiber layer is disposed between the first carbon cloth layer and the first web layer;

fixedly connecting the plurality of second carbon cloth layers and the plurality of second net tire layers based on the discontinuous layers to obtain continuous layers; in the continuous layer, one layer of the second carbon cloth layer is arranged between two adjacent second net tire layers;

fixing a plurality of said discontinuous layers and a plurality of said continuous layers to a surface of said cushioning layer;

removing the buffer layer to obtain the carbon-carbon prefabricated body;

wherein a first carbon cloth layer in the discontinuous layer is in contact with the buffer layer, one continuous layer is arranged between two adjacent discontinuous layers, and a second carbon cloth layer in the continuous layer is in contact with a first mesh layer in the discontinuous layer.

2. The method of claim 1, wherein the step of fixedly connecting the first carbon cloth layer, the continuous fiber layer, and the first web layer to form an interrupted layer based on the breaker layer comprises:

disposing the first carbon cloth layer on the buffer layer;

winding carbon fiber tows on the first carbon cloth layer at preset intervals to form the continuous fiber layer;

disposing the first web layer on the continuous fiber layer;

and (3) pricking in felting needles from the first net tire layer to the first carbon cloth layer at a preset needling depth, a preset needling density and a preset needling angle, so as to fixedly connect the first carbon cloth layer, the continuous fiber layer and the first net tire layer, and obtain the discontinuous layer.

3. The method of claim 2, wherein the step of fixedly connecting the plurality of second carbon cloth layers to the plurality of second tire layers based on the discontinuous layers to provide a continuous layer comprises:

disposing a plurality of said second carbon cloth layers and a plurality of said second web layers on a first web layer of said discontinuous layers;

and (3) the felting needles are penetrated from the second net tire layer to the second carbon cloth layer according to the preset needling depth, the preset needling density and the preset needling angle, so that a plurality of layers of the second carbon cloth layer and a plurality of layers of the second net tire layer are fixedly connected, and the continuous layer is obtained.

4. The method of claim 1, wherein when the surface of the mold comprises an arcuate configuration, prior to the step of securing the plurality of discontinuous layers and the plurality of continuous layers to the surface of the cushion layer, the method further comprises:

and in the plurality of discontinuous layers and the plurality of continuous layers, the second carbon cloth layer and the second net tire layer with preset sizes are arranged at the position corresponding to the arc-shaped structure at intervals.

5. The method of claim 1, wherein the continuous layer comprises 5 of the second carbon cloth layer and 5 of the second web layer.

6. The method according to claim 1, wherein the first carbon cloth layer and the second carbon cloth layer are plain cloth or non-woven cloth, and the areal density of the first carbon cloth layer and the second carbon cloth layer is 25 to 40 g/m.

7. The method of claim 1, wherein the first and second web layers have an areal density of 40 to 120 grams per square meter.

8. The method according to claim 2, wherein the width of the carbon fiber tows is 5 mm, and the preset pitch is 2-50 mm.

9. The method according to claim 3, wherein the predetermined needling depth is 9-15 mm, the predetermined needling density is 40-60 needles/cm, and the predetermined needling angle is 60-120 degrees.

10. A carbon-carbon preform, comprising:

a plurality of discontinuous layers and a plurality of continuous layers;

the discontinuous layers and the continuous layers are sequentially arranged at intervals, and one continuous layer is arranged between two adjacent discontinuous layers;

the discontinuous layer comprises a first carbon cloth layer, a continuous fiber layer and a first web layer, wherein the continuous fiber layer is arranged between the first carbon cloth layer and the first web layer;

the continuous layer comprises a plurality of second carbon cloth layers and a plurality of second net tire layers, and one second carbon cloth layer is arranged between two adjacent second net tire layers;

wherein a first mesh layer of the discontinuous layers is disposed on one side of the carbon preform and a second carbon cloth layer of the continuous layers is in contact with the first mesh layer of the discontinuous layers.

Technical Field

The invention relates to the technical field of composite material preform preparation, in particular to a carbon-carbon preform and a preparation method thereof.

Background

With continuous consumption of traditional energy and increasingly serious negative effects on the environment, the monocrystalline silicon wafer has wide market demand as a basic material for photovoltaic power generation, and when a monocrystalline silicon rod is pulled by adopting a monocrystalline furnace, a crucible side in the monocrystalline furnace needs to have certain mechanical properties and can bear high temperature, cold and hot circulation and a corrosion environment in the furnace.

At present, a carbon-carbon composite material with high strength, high thermal conductivity, low expansion coefficient and good thermal shock resistance is often adopted as a material for preparing a crucible edge, and the overall performance of the carbon-carbon composite material mainly depends on the performance of a carbon-carbon preform. The method for preparing the carbon-carbon prefabricated body by adopting the fiber needling method mainly comprises two modes, wherein one mode is continuous layering, namely, the carbon fiber cloth and the carbon fiber net tire are subjected to pre-needling to obtain composite cloth, the composite cloth is continuously wrapped and wound on a mould with a certain tension force, and continuous needling is carried out while the composite cloth is wound, so that multiple layers of composite cloth are connected together to obtain the carbon-carbon prefabricated body; the other type is discontinuous layering, the carbon fiber cloth and the carbon fiber net tire are directly paved on the surface of a mold without pre-needling, after the single-layer carbon fiber cloth and the carbon fiber net tire are connected in a needling mode, a layer of carbon fiber cloth and a layer of carbon fiber net tire are paved, two layers of carbon fiber cloth and the carbon fiber net tire are connected in an interlayer mode through needling, and after repeated paving and needling, the carbon-carbon prefabricated body is finally obtained.

However, in the prior art, the tensile force of the composite cloth cannot be released after the composite cloth is continuously needled, so that the carbon preform has the defects of ' dragon ridges ', ' bulges ', layering ' and the like, and the mechanical properties of the carbon preform can be reduced. And the carbon preform is prepared by adopting the discontinuous laying layer, and the mechanical property of the carbon preform is reduced due to more joints of the carbon fiber cloth and the carbon fiber net tire.

Disclosure of Invention

The invention provides a carbon-carbon prefabricated part and a preparation method thereof, aiming at improving the mechanical property of the carbon-carbon prefabricated part.

In a first aspect, an embodiment of the present invention provides a method for preparing a carbon-carbon preform, where the method includes:

arranging a buffer layer on the surface of the mould;

fixedly connecting the first carbon cloth layer, the continuous fiber layer and the first net tire layer based on the buffer layer to obtain an interrupted layer; the continuous fiber layer is disposed between the first carbon cloth layer and the first web layer;

fixedly connecting the plurality of second carbon cloth layers and the plurality of second net tire layers based on the discontinuous layers to obtain continuous layers; in the continuous layer, one layer of the second carbon cloth layer is arranged between two adjacent second net tire layers;

fixing a plurality of said discontinuous layers and a plurality of said continuous layers to a surface of said cushioning layer;

removing the buffer layer to obtain the carbon-carbon prefabricated body;

wherein a first carbon cloth layer in the discontinuous layer is in contact with the buffer layer, one continuous layer is arranged between two adjacent discontinuous layers, and a second carbon cloth layer in the continuous layer is in contact with a first mesh layer in the discontinuous layer.

Optionally, the step of fixedly connecting the first carbon cloth layer, the continuous fiber layer, and the first mesh layer based on the buffer layer to obtain the discontinuous layer includes:

disposing the first carbon cloth layer on the buffer layer;

winding carbon fiber tows on the first carbon cloth layer at preset intervals to form the continuous fiber layer;

disposing the first web layer on the continuous fiber layer;

and (3) pricking in felting needles from the first net tire layer to the first carbon cloth layer at a preset needling depth, a preset needling density and a preset needling angle, so as to fixedly connect the first carbon cloth layer, the continuous fiber layer and the first net tire layer, and obtain the discontinuous layer.

Optionally, the step of fixedly connecting the multiple second carbon cloth layers and the multiple second mesh layers based on the discontinuous layer to obtain a continuous layer includes:

disposing a plurality of said second carbon cloth layers and a plurality of said second web layers on a first web layer of said discontinuous layers;

and (3) the felting needles are penetrated from the second net tire layer to the second carbon cloth layer according to the preset needling depth, the preset needling density and the preset needling angle, so that a plurality of layers of the second carbon cloth layer and a plurality of layers of the second net tire layer are fixedly connected, and the continuous layer is obtained.

Optionally, when the surface of the mold comprises an arcuate structure, prior to the step of securing the plurality of discontinuous layers and the plurality of continuous layers to the surface of the buffer layer, the method further comprises:

and in the plurality of discontinuous layers and the plurality of continuous layers, the second carbon cloth layer and the second net tire layer with preset sizes are arranged at the position corresponding to the arc-shaped structure at intervals.

Optionally, the continuous layer comprises 5 layers of the second carbon cloth layer and 5 layers of the second web layer.

Optionally, the first carbon cloth layer and the second carbon cloth layer are plain cloth or non-woven cloth, and the areal density of the first carbon cloth layer and the second carbon cloth layer is 25-40 g/m.

Optionally, the areal density of the first mesh layer and the second mesh layer is 40-120 g/m.

Optionally, the width of the carbon fiber tows is 5 mm, and the preset distance is 2-50 mm.

Optionally, the preset needling depth is 9-15 mm, the preset needling density is 40-60 needles/square centimeter, and the preset needling angle is 60-120 degrees.

In a second aspect, embodiments of the present invention provide a carbon-carbon preform comprising:

a plurality of discontinuous layers and a plurality of continuous layers;

the discontinuous layers and the continuous layers are sequentially arranged at intervals, and one continuous layer is arranged between two adjacent discontinuous layers;

the discontinuous layer comprises a first carbon cloth layer, a continuous fiber layer and a first web layer, wherein the continuous fiber layer is arranged between the first carbon cloth layer and the first web layer;

the continuous layer comprises a plurality of second carbon cloth layers and a plurality of second net tire layers, and one second carbon cloth layer is arranged between two adjacent second net tire layers;

wherein a first mesh layer of the discontinuous layers is disposed on one side of the carbon preform and a second carbon cloth layer of the continuous layers is in contact with the first mesh layer of the discontinuous layers.

The embodiment of the invention provides a carbon-carbon preform and a preparation method thereof, wherein the preparation method comprises the following steps: arranging a buffer layer on the surface of the mould; fixedly connecting the first carbon cloth layer, the continuous fiber layer and the first net tire layer based on the buffer layer to obtain an interrupted layer; the continuous fiber layer is arranged between the first carbon cloth layer and the first net tire layer; fixedly connecting the plurality of second carbon cloth layers and the plurality of second net tire layers based on the discontinuous layers to obtain continuous layers; in the continuous layer, one second carbon cloth layer is arranged between two adjacent second net layers; fixing the multiple discontinuous layers and the multiple continuous layers on the surface of the buffer layer; removing the buffer layer to obtain a carbon-carbon prefabricated body; wherein, the first carbon cloth layer in the discontinuous layer contacts with the buffer layer, and one deck continuous layer sets up between two adjacent discontinuous layers, and the second carbon cloth layer in the continuous layer contacts with the first net child layer in the discontinuous layer. In this application, through set up the discontinuous layer including first carbon cloth layer, continuous fiber layer and first net child layer on the mould surface, and include the continuous layer of multilayer second carbon cloth layer and multilayer second net child layer, and set up multilayer discontinuous layer and continuous layer on the buffer layer on the mould in turn, thereby the preparation obtains the carbon-carbon preform, the joint of carbon cloth and carbon-fiber net child has been reduced, the mechanical properties of carbon-carbon preform has been improved, simultaneously, make the tensile force in the continuous layer obtain the release, reduce in the carbon-carbon preform because of the tensile force can not obtain the release and produce defects such as "dragon spine", "swell" and "layering", the mechanical properties of carbon-carbon preform has further been improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a flow chart showing the steps of a method for preparing a carbon-carbon preform according to a first embodiment of the present invention;

FIG. 2 is a schematic view showing a carbon-carbon preform fabricating apparatus according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an interrupted layer according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of a continuous layer structure in a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a carbon-carbon preform according to a first embodiment of the present invention;

FIG. 6 is a flow chart showing the steps of a method for producing a carbon-carbon preform according to example II of the present invention;

FIG. 7 is a schematic diagram showing a process for preparing a continuous layer in example two of the present invention;

FIG. 8 is a schematic structural diagram of a carbon-carbon preform surface layer after needling in the second embodiment of the present invention;

fig. 9 shows a schematic arc-filling diagram of a profile element in a second embodiment of the invention.

Description of reference numerals: 10-carbon preform, 20-needling equipment workbench, 30-mould, 40-buffer layer, 50-needling mechanism, 60-needle, 11-first carbon cloth layer, 12-continuous fiber layer, 13-first net tyre layer, 14-second carbon cloth layer, 15-second net tyre layer and 16-carbon preform surface layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.