阅读说明：本技术 一种海泡石增韧刀具材料的制备方法 (Preparation method of sepiolite toughening cutter material ) 是由 伍小波 姜利民 高平平 周书助 于 2021-08-04 设计创作，主要内容包括：本发明公开一种海泡石增韧刀具材料的制备方法。该增韧增强材料不限于应用在刀具中。主要包括如下步骤：S1酸改性海泡石,并混合有机碳源；S2高温碳化,在其表面形成一层碳化硅晶须包覆层；S3将上述所得高温碳化硅包增粉末与铝源充分混合,再次进行表面氧化铝包覆处理；S4将氧化铝包覆碳化硅晶须粉末添加于刀具材料中增韧。本发明的有益效果是：1)利用海泡石中的硅为原料,利用海泡石的纤维状结构,原料来源廉价,易于实现工业化；2)通过对纳米碳化硅进行包覆处理,不但增强了碳化硅晶须之间的分散性,并且克服了碳化硅与部分刀具材料润湿性差的问题；3)材料广泛适用于硬质合金刀具和陶瓷刀具的增韧补强,显著提升刀具使用寿命。(The invention discloses a preparation method of a sepiolite toughening cutter material. The toughened reinforcing material is not limited to use in cutting tools. The method mainly comprises the following steps: s1 acid-modified sepiolite and mixing with organic carbon source; s2, carbonizing at high temperature, and forming a silicon carbide whisker coating layer on the surface of the silicon carbide whisker; s3, fully mixing the high-temperature silicon carbide coated powder with an aluminum source, and performing surface aluminum oxide coating treatment again; s4 adding the alumina coated silicon carbide whisker powder into the cutter material for toughening. The invention has the beneficial effects that: 1) silicon in the sepiolite is used as a raw material, and the fibrous structure of the sepiolite is utilized, so that the raw material source is low, and the industrialization is easy to realize; 2) by coating the nano silicon carbide, the dispersibility of the silicon carbide whiskers is enhanced, and the problem of poor wettability of the silicon carbide and part of cutter materials is solved; 3) the material is widely applicable to toughening and reinforcing of hard alloy cutters and ceramic cutters, and obviously prolongs the service life of the cutters.)

1. A preparation method of a sepiolite toughening cutter material comprises the following steps:

s1 acid-modified sepiolite and mixing with organic carbon source;

s2, carrying out high-temperature carbonization on the sepiolite by utilizing the organic carbon source adsorbed on the surface of the sepiolite at high temperature, and forming a silicon carbide whisker coating layer on the surface of the sepiolite;

s3, fully mixing the powder obtained in the step S2 with an aluminum source, and carrying out aluminum oxide coating treatment to obtain aluminum oxide-coated silicon carbide whiskers;

s4 adding the alumina coated silicon carbide whisker powder into the cutter material for toughening.

2. The method for preparing a sepiolite toughening cutter material according to claim 1, wherein the acid modified sepiolite of step S1 is mixed with an organic carbon source; the acid used for modifying the sepiolite acid is one or more of nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and the like, the concentration is 0.1-3M/L, the organic carbon source is one or more of glucose, ethane, propane, carbon black, agricultural crops, organic polymers and the like, and the using amount is 0.1-15 wt%.

3. The method for preparing the sepiolite toughening cutter material according to claim 1, wherein the method for preparing the acid modified sepiolite in the step S1 comprises the following steps: stirring and dipping the sepiolite for 0.5 to 12 hours at room temperature by using acid with the concentration of 0.1 to 3M/L, and adopting super-strong pulse CO₂And treating the powder by using a dot matrix laser, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2500-3000W, the wavelength of the laser is 10600-200000 nm, and the time is 10-200 minutes.

4. The method for preparing the sepiolite toughening cutter material according to claim 1, wherein the sepiolite used in the step S1 is subjected to the following pretreatment: soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving.

5. The method for preparing the sepiolite toughening cutter material according to claim 1, wherein S2 is implemented by carrying out high-temperature carbonization on sepiolite by using an organic carbon source adsorbed on the surface of the sepiolite at a high temperature, and is characterized in that 0-10 parts of boric acid and Fe are added₂O₃The raw materials are put into a cylinder type ball mill, ball-milled, dried, sieved by a 60-mesh sieve, put into a special graphite container and put into a high-temperature sintering furnace for high-temperature carbonization.

6. The method for preparing the sepiolite toughening cutter material according to claim 1, wherein the high-temperature carbonization method in the step S2 is to heat up to 1200 ℃ at a rate of 10 ℃/min, continue to heat up to 1500-1650 ℃ at a rate of 5 ℃/min, keep the temperature for 2-5 h, and cool to room temperature with a furnace under a nitrogen protective atmosphere.

7. The method for preparing a sepiolite toughened cutter material as claimed in claim 1, wherein the aluminum source used in the step S3 for mixing with the high temperature silicon carbide-containing powder is aluminum nitrate, aluminum halide, organic aluminum source, etc.

8. The method for preparing a sepiolite toughening cutter material according to claim 1, wherein the step S2 is performed by using an organic carbon source adsorbed on the surface of the sepiolite to perform a high-temperature carbonization reaction with the sepiolite, and the prepared carbonization product is whisker silicon carbide.

9. The method for preparing the sepiolite toughening cutter material according to claim 1, wherein the surface alumina coating treatment process of the silicon carbide whisker comprises the following steps: and fully mixing the whisker silicon carbide and an aluminum source to form a coating structure, then filling the coating mixed powder into an alumina container, putting the alumina container into an oxidation furnace, and preserving the heat for 3-6 hours at 700 ℃ in the air.

10. The sepiolite used according to claim 4 for performing step S1 is subjected to the following pre-treatment: soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving, and is characterized in that a separation reagent adopts one or more of a plant starch debranching enzyme (SDBE) reagent, an auxin (IAA) reagent, a human Adenosine Monophosphate Activated Protein (AMAP) kit and the like; the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

Technical Field

The invention relates to the field of materials, in particular to a preparation method of a sepiolite toughening cutter material.

Background

In machining, machining is a basic and reliable means of precision machining. The competition of the machine manufacturing industry in the 21 st century is essentially the competition of precise high-speed cutting, and the competition is comprehensive. The tool material is the foundation of the tool industry, and the development of the tool material plays a decisive role in improving the cutting performance. The existing cutting tool materials in China mainly comprise three types of high-speed steel, hard alloy and superhard materials. Due to rapid development of high-speed cutting, dry cutting and hard cutting, hard alloy becomes a main material processing cutter; superhard cutter materials play more and more important roles in the mold processing industry and are the most promising cutters in the three types of cutters. However, the traditional high-hardness cutter material still has the defects of insufficient toughness and strength and the like, and the service life and the application range of the traditional high-hardness cutter material are seriously limited. Therefore, how to improve the toughness of the high hardness tool material becomes a problem to which researchers focus.

The silicon carbide whisker reinforced composite material has excellent mechanical properties and physical properties such as high specific strength and specific stiffness, wear resistance, fatigue resistance, low coefficient of thermal expansion, good heat conductivity, good electrical conductivity and the like, and can be widely applied to the fields of aerospace, military, automobiles, electronics, sports and the like. Because the silicon carbide has the advantages, the silicon carbide is usually applied to reinforced and toughened composite materials in the prior art, and at present, more and more researches show that the silicon carbide whiskers have a good effect of reinforcing and toughening a cutter material and are particularly widely applied to ceramic cutter materials.

However, the existing preparation method of the silicon carbide toughened metal ceramic generally has the defects that the wettability of silicon carbide and the metal ceramic is poor, and a two-phase interface is difficult to control, so that the mechanical property of the composite material is low, and the application of the composite material is severely restricted; meanwhile, because the silicon carbide particles are small in size and large in surface activity, the silicon carbide particles are easy to adsorb each other, large-area agglomeration of the silicon carbide particles is easy to cause, the silicon carbide and the metal ceramic material are not uniformly dispersed, and the mechanical property of the composite material is reduced.

Disclosure of Invention

The defects of the prior art are as follows: the existing preparation method of the silicon carbide toughened metal ceramic generally has the technical bottlenecks of poor wettability of silicon carbide and the metal ceramic, difficult control of a two-phase interface, poor dispersibility of silicon carbide whiskers and the like.

On one hand, the invention designs a double-layer coating structure, and adds a transition layer between the silicon carbide and the metal ceramic, thereby solving the technical bottlenecks of poor wettability of the metal ceramic, difficult control of two-phase interfaces, poor dispersibility and the like; on the other hand, by means of ultrastrong pulses of CO₂The lattice laser forms linear micro-nano holes on the substrate material, thereby designing the growth trend for the in-situ production of the crystal whisker silicon carbide and enabling the crystal whisker to grow and cover the surface of the substrate. The utility model discloses a be applicable to the obdurability of various tool and die and structure spare part, be particularly suitable for improving the life-span of instrument and spare part.

The technical scheme of the invention is as follows:

(1) a preparation method of a sepiolite toughening cutter material comprises the following steps:

s1 acid-modified sepiolite and mixing with organic carbon source;

s2, carrying out high-temperature carbonization on the sepiolite by utilizing the organic carbon source adsorbed on the surface of the sepiolite at high temperature, and forming a silicon carbide whisker coating layer on the surface of the sepiolite;

s3, fully mixing the powder obtained in the step S2 with an aluminum source, and carrying out aluminum oxide coating treatment to obtain aluminum oxide-coated silicon carbide whiskers;

s4 adding the alumina coated silicon carbide whisker powder into the cutter material for toughening.

(2) Acid-modified sepiolite obtained in step S1, and mixing an organic carbon source; the acid used for modifying the sepiolite acid is one or more of nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and the like, and the concentration is 0.1-3M/L. The organic carbon source is one or more of glucose, ethane, propane, carbon black, agricultural crops, organic polymers and the like, the dosage is 0.1-15 wt%,

(3) the preparation method of the acid modified sepiolite in the step S1 comprises the following steps: stirring and dipping the sepiolite for 0.5 to 12 hours at room temperature by using acid with the concentration of 0.1 to 3M/L, and adopting super-strong pulse CO₂And treating the powder by using a dot matrix laser, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2500-3000W, the wavelength of the laser is 10600-200000 nm, and the time is 10-200 minutes.

(4) The sepiolite used in step S1 is subjected to the following pre-treatment: soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving.

(5) S2 high-temperature carbonization of sepiolite at high temperature by using organic carbon source adsorbed on the surface of sepiolite, and is characterized in that 0-10 parts of boric acid and Fe are added₂O₃The raw materials are put into a cylinder type ball mill, ball-milled, dried, sieved by a 60-mesh sieve, put into a special graphite container and put into a high-temperature sintering furnace for high-temperature carbonization.

(6) S2, the high-temperature carbonization method comprises the steps of heating to 1200 ℃ at a speed of 10 ℃/min under the protection of nitrogen, continuously heating to 1500-1650 ℃ at a speed of 5 ℃/min, preserving heat for 2-5 h, and cooling to room temperature along with a furnace.

(7) The aluminum source used for mixing with the high-temperature silicon carbide-containing powder described in S3 is aluminum nitrate, aluminum halide, an organic aluminum source, or the like.

(8) And step S2, carbonizing the sepiolite at high temperature by using the organic carbon source adsorbed on the surface of the sepiolite, wherein the prepared carbonized product is whisker silicon carbide.

(9) The surface alumina coating treatment process of the silicon carbide whisker comprises the following steps: and fully mixing the whisker silicon carbide and an aluminum source to form a coating structure, then filling the coating mixed powder into an alumina container, putting the alumina container into an oxidation furnace, and preserving the heat for 3-6 hours at 700 ℃ in the air.

(10) The sepiolite used in step S1 is subjected to the following pre-treatment: soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The method is characterized in that the separation reagent adopts one or more of plant starch debranching enzyme (SDBE) reagent, auxin (IAA) reagent, human Adenosine Monophosphate Activated Protein (AMAP) kit and the like; the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

To characterize the novelty of the different components and processes of the invention, a comparison was made separately in the examples (see in particular the example schemes) and the relevant properties are shown in the performance tables.

TABLE 1

Drawings

Fig. 1 and 2 are a morphology graph and an energy spectrum graph of double-coated powder in example 10, and it is obvious from the graphs that sepiolite fibers form a silicon carbide whisker surface coating structure through pretreatment, and related element compositions are observed through the energy spectrum. Indicating that the powder pretreatment formed a double coating.

Detailed Description

In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours, wherein the concentration of nitric acid is 0.5M/L. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 2

(1) The original sepiolite (non-acid modified sepiolite) adopts super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 3

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) And (2) putting the acid-modified sepiolite into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, putting into a special graphite container, putting into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min under the protection of nitrogen, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 4

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂Lattice laser treatment of the powder with subsequent organic carbon sourceMixing, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Putting the obtained powder into an oxidation furnace, and keeping the temperature of the powder in the air at 700 ℃ for 3 h.

(4) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 5

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing into a cylinder type ball mill, ball-milling, drying, sieving with 60 mesh sieve, placing into a special graphite container, placing into a high-temperature sintering furnace, heating to 1200 deg.C at a speed of 10 deg.C/min, heating to 2150 deg.C at a speed of 5 deg.C/min under nitrogen protection atmosphere, and keeping the temperatureAnd (3) cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 6

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separating agent adopts plant starch debranching enzyme (SDBE) and the cleaning agent adopts pure water.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 7

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature with the nitric acid concentration of 0.5M/LStone for 3h, adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. No separating agent was added.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 8

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. (no carbon source is added) then soaking, ball milling, separating, filtering, purifying, washing, drying, and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Loading into a cylinder type ball mill, ball-milling, drying, sieving with 60 mesh sieve, loading into a special graphite container, and placing into a high-temperature sintering furnaceUnder the protection of nitrogen, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 9

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 2800W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt% (1 wt% respectively), soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating the mixture to 1200 ℃ at the speed of 10 ℃/min, continuously heating the mixture to 1850 ℃ at the speed of 5 ℃/min, keeping the temperature for 3h, and cooling the mixture to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) Fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain aluminum oxide coated silicon carbide whiskers;

(4) then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.

Example 10

(1) S1 acid modified sepiolite: the acid used for modifying the sepiolite acid is prepared by stirring and dipping the sepiolite at room temperature for 3 hours with the nitric acid concentration of 0.5M/L and adopting super-strong pulse CO₂And (3) carrying out dot matrix laser treatment on the powder, and then mixing the powder with an organic carbon source, wherein the power of the super-strong pulse laser is 3000W, the wavelength of the laser is 10600nm, and the time is 20 minutes. Then mixing with organic carbon sources of glucose, ethane and propane with the dosage of 0.3 wt%, soaking, ball milling, separating, filtering, purifying, cleaning, drying and sieving. The separation reagent adopts plant starch debranching enzyme (SDBE) reagent, and the cleaning agent adopts a mixture of acetone and water with the molar mass of 0.1.

(2) Adding 6 parts of boric acid and Fe into the acid-modified sepiolite₂O₃Placing the mixture into a cylinder type ball mill, carrying out ball milling, drying, sieving by using a 60-mesh sieve, placing the mixture into a special graphite container, placing the special graphite container into a high-temperature sintering furnace, heating to 1200 ℃ at the speed of 10 ℃/min, continuously heating to 2150 ℃ at the speed of 5 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace. High-temperature carbonization is carried out, and a silicon carbide whisker coating layer is formed on the surface of the silicon carbide whisker.

(3) And fully mixing the obtained powder with aluminum nitrate, and carrying out aluminum oxide coating treatment to obtain the aluminum oxide coated silicon carbide whisker.

(4) Then the coated mixed powder is put into an alumina container and put into an oxidation furnace, and the temperature is kept for 3 hours at 700 ℃ in the air.

(5) 3 percent of the coated sepiolite is added into the cutter material according to the traditional powder metallurgy method for pressing and sintering.