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Rapid preparation method for brake material based on polycarbosilane modification

A technology of polycarbosilane and brake materials, which is applied in the field of rapid preparation of brake materials, can solve the problems of performance degradation, composite material creep performance reduction, erosion of fibers, etc., and achieve the effect of increasing the service life and increasing the degree of densification

Active Publication Date: 2019-03-08
上海康碳复合材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the LSI process is that when preparing C / SiC composite materials, due to the reaction process between molten silicon and matrix carbon, it will inevitably react with carbon fibers, and the fibers will be eroded, resulting in performance degradation; at the same time, a certain amount of Si leads to reduced creep performance of composites
[0004] The single hot-press sintering process has a high sintering temperature, and the interface between the fiber and the matrix is ​​a strong bond, which is not conducive to the improvement of the toughness of the material. In addition, the sintering additive Si powder erodes the fiber at high temperature during the hot-press sintering process, resulting in material The mechanical properties are reduced, and there is also the unfavorable phenomenon that Si corrodes the fiber in the liquid phase silicon impregnation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for rapidly preparing brake materials based on polycarbosilane modification, comprising the following steps:

[0020] 1) Soak 3mm chopped carbon fibers in dimethyl sulfoxide solution for 2 hours, and remove the glue for later use;

[0021] 2) Strongly disperse the chopped carbon fibers after degumming;

[0022] 3) Weigh polycarbosilane and dissolve it in acetone to form a solution, the volume fraction of polycarbosilane solution is 30%;

[0023] 4) Mix the solution in the above step 3) with the dispersed chopped carbon fiber in the above 2) and phenolic resin powder below 200 mesh, and then cold press it in a mold at 200°C to form a billet. The heating temperature is 150°C, the pressure is 15000 kg, the pressure time is 0.5h, and it is taken out after cooling down;

[0024] 5) Put the middle brake disc body in 4) into a high-temperature furnace for carbonization treatment for 10 hours. The heating rate of the high-temperature furnace is 40°C / h, the target tem...

Embodiment 2

[0030] A method for rapidly preparing brake materials based on polycarbosilane modification, comprising the following steps:

[0031] 1) Soak 30mm chopped carbon fibers in dimethyl sulfoxide solution for 3 hours, and remove the glue for later use;

[0032] 2) Strongly disperse the chopped carbon fibers after degumming;

[0033] 3) Weighing polycarbosilane and dissolving it in ethanol to form a solution; the volume fraction of polycarbosilane solution is 30% to 70%;

[0034] 4) Mix the solution in the above step 3) with the dispersed chopped carbon fiber in the above 2) and phenolic resin powder below 200 mesh, and then cold press it in a mold at 300°C to form a billet. The heating temperature is 150°C, the pressure is 30,000 kg, and the pressure is applied for 1 hour and then taken out after cooling down;

[0035] 5) Put the brake disc body in 4) into a high-temperature furnace for carbonization treatment for 20 hours. The heating rate of the high-temperature furnace is 80°C...

Embodiment 3

[0041] A method for rapidly preparing brake materials based on polycarbosilane modification, comprising the following steps:

[0042] 1) Soak 20mm chopped carbon fibers in dimethyl sulfoxide solution for 4 hours, and remove the glue for later use;

[0043] 2) Strongly disperse the chopped carbon fibers after degumming;

[0044] 3) Weigh polycarbosilane and dissolve it in acetone to form a solution, the volume fraction of polycarbosilane solution is 70%;

[0045] 4) Mix the solution in the above step 3) with the dispersed chopped carbon fiber in the above 2) and the phenolic resin powder below 200 meshes, then cold press in a mold at 250°C to form a billet, and take it out after cooling down;

[0046] 5) Put the middle brake disc body in 4) into a high-temperature furnace for carbonization treatment for 18 hours. The heating rate of the high-temperature furnace is 80°C / h, the target temperature in the high-temperature furnace is 1800°C, and the carbonization treatment time is ...

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Abstract

The invention discloses a rapid preparation method for a brake material based on polycarbosilane modification. According to the method, a low-temperature hot pressing and liquid silicon infiltration combined process mode is adopted, a low-temperature hot-pressing process takes short carbon fibers as a reinforcing body, phenolic resin serves as a matrix, polycarbosilane serves as a modified additive material, low-temperature cold pressing and carbonization treatment are carried out so as to prepare a blank, and then liquid silicon infiltration, machining and surface treatment are carried out soas to obtain a carbon ceramic friction material finished product. The preparation method has the advantage that the service life of the brake material is greatly prolonged.

Description

technical field [0001] The invention relates to a rapid preparation method of a brake material based on polycarbosilane modification. Background technique [0002] The basic principle of the hot pressing sintering process is to mix the sinterable matrix raw material powder and fibers to form a green body, and then pressurize and sinter at high temperature. Due to the high covalent bond strength of SiC, it can only be densified under the pressure of 2500 ° C and 50 MPa. Therefore, sintering aids that can promote powder solid-phase diffusion and liquid-phase formation have become an inevitable choice for low-temperature sintering of silicon carbide. Tang Hanling et al. used short carbon fiber as reinforcement, nano-SiC powder as matrix material, boron powder, carbon powder, and aluminum powder as sintering aids, and mixed fiber and powder by wet ball ink mixing method. Then under the argon atmosphere, the sintering temperature is 1800°C, and the pressure is 25MPa, the C / C-Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/565C04B35/622C04B35/634
CPCC04B35/52C04B35/565C04B35/622C04B35/634C04B35/83
Inventor 吴彪邵忠贾林涛
Owner 上海康碳复合材料科技有限公司
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