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Method for preparing carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material

A technology of boron nitride double and friction materials, which is applied in the field of new materials, can solve the problems of many and complex control factors of chemical vapor deposition process, difficulty in precise control of BN composition and shape, complex and changeable composition, etc., and achieve simple and easy production process Controllable, controllable microstructure and performance, and low preparation cost

Active Publication Date: 2012-05-23
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BN prepared by chemical vapor infiltration method is mostly amorphous B x N compounds, the composition is complex and changeable, the stability is poor, the process control factors of chemical vapor deposition are many and complex, and it is difficult to accurately control the composition and morphology of BN

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) The area density is 70~80g / m 2 Lay the net tire on the horizontal working table, pour the hexagonal BN powder into the standard sieve, and then gently shake the standard sieve to spread the BN powder evenly on the net tire. Then turn the thin layer of the net tire upside down and shake it gently to shake off the unadhered hexagonal BN powder, while the adhered hexagonal BN powder evenly adheres to the carbon fiber of the net tire through mechanical bonding force.

[0030] Repeat above-mentioned operation, make the other side of network tire thin layer also stick the boron nitride powder of similar amount. By comparing the weight change of the single-layer mesh before and after dusting, calculate the powdering amount of the single-layer mesh, so that the BN powder accounts for about 5% of the weight of the single-layer mesh.

[0031] (2) Superimpose the net tires obtained in step (1) layer by layer, and then use the barb thorns to needle the superimposed net tires, ...

Embodiment 2

[0035] Operation method is identical with embodiment 1, and concrete process parameter is:

[0036] (1) The mesh tread density is 40~50g / m 2, the adhered hexagonal BN powder accounts for about 20% of the mesh weight;

[0037] (2) Acupuncture made carbon fiber preform containing hexagonal BN powder with a material density of 0.52g / cm 3 .

[0038] (3) Adopt propylene as the carbon source gas, nitrogen as the diluent gas, the volume ratio of propylene and nitrogen is 1:2, pyrolytic carbon deposition temperature: 1100 ℃, deposition time: 80 hours, the prepared density is 1.77g / cm 3 C / C-BN friction material;

[0039] (4) The graphitization temperature is 2300°C, the heating and holding time are 15 hours, normal pressure, argon protection, and the C / C-BN friction material numbered B is prepared. .

Embodiment 3

[0041] Operation method is identical with embodiment 1, and concrete process parameter is:

[0042] (1) The mesh tread density is 50~60g / m 2 , the adhered hexagonal BN powder accounts for about 10% of the net tire mass;

[0043] (2) Acupuncture made carbon fiber preform containing hexagonal BN powder with a material density of 0.35g / cm 3 .

[0044] (3) Natural gas is used as carbon source gas, hydrogen is used as diluent gas, the volume ratio of natural gas and hydrogen is 1:1, pyrolytic carbon deposition temperature: 950°C, deposition time: 100 hours, and the obtained density is 1.55g / cm 3 C / C-BN friction material;

[0045] (4) The graphitization temperature is 1800°C, the heating and holding time are 15 hours, normal pressure, argon protection, and the C / C-BN friction material with the code C is prepared. .

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Abstract

The invention relates to a method for preparing a carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material. The method comprises the following steps of: 1, spreading powder in layers: uniformly adhering boron nitride (BN) powder on two sides of each monolayer carbon fiber felt; 2, superimposing, needling and compounding: superimposing the felts obtained in the step 1 on one another, and needling the superimposed felts to obtain a BN powder-containing carbon fiber prefabricated body material; 3, chemical vapor infiltration: depositing a pyrolytic carbon matrixfrom the BN powder-containing carbon fiber prefabricated body material by adopting a chemical vapor infiltration method to obtain a carbon fiber reinforced carbon and boron nitride double-matrix (C / C-BN) friction material; and 4, graphitizing: graphitizing the C / C-BN composite material which is obtained by the step 3 to obtain the desired C / C-BN friction material. The method for preparing the carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material has the advantages of simple and controllable production process, low preparation cost, controllable microstructure and performance of the prepared material, uniform structure, high strength, high temperature resistance, corrosion resistance, high frictional and abrasive properties and capacity of realizing industrial production.

Description

Technical field: [0001] The invention discloses a preparation method of a carbon fiber reinforced carbon and hexagonal boron nitride double matrix friction material, which belongs to the technical field of new materials. Background technique, [0002] Boron nitride (BN) has good thermal conductivity, electrical insulation, and good lubricity at high temperatures, and is an excellent high-temperature solid lubricant. In recent years, BN series materials have attracted widespread attention as friction materials. There are many similarities between BN and C, including density, thermal conductivity, heat capacity, and crystal structure. At the same time, BN has the characteristics of high temperature resistance and high oxidation temperature of ceramics, and its oxidation resistance is far superior to that of carbon / carbon composite materials. The carbon material is 450? It begins to oxidize, and the obvious oxidation temperature of BN in air is 800? about. [0003] BN has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/80C04B35/5833C04B35/622
Inventor 肖鹏李专张本固李鹏涛
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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