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Preparation method and application of a carbon ceramic friction material

A technology of friction materials and carbon ceramics, which is applied in the direction of friction linings, mechanical equipment, gear transmission mechanisms, etc., can solve the problems of unstable braking performance, easy locking, and damage to material strength, so as to reduce the existence of residual silicon and brake Stable performance and extended brake life

Active Publication Date: 2021-12-28
HUNAN BOWANG CARBON CERAMIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reaction siliconizing process, due to the consumption of some carbon, the density of the carbon-carbon green body is required to be high, and a large amount of liquid silicon filled in the large pores in the green body cannot completely react with the carbon, resulting in a high residual amount of silicon. The internal and surface microstructures and components of carbon-ceramic friction materials are quite different. During the braking process, it is easy to lock up, and the vibration is large. In the later stage of friction, the braking performance is unstable and the wet state attenuation is too large.
And in the process of infiltration, liquid silicon and pyrolytic carbon or some carbon fibers form an excessively strong interface, resulting in damage to the strength of the material
The PIP process can well eliminate the inhomogeneity caused by the carbon-carbon material during the preparation process. The bonding ability of the silicon carbide generated by the cracking of the precursor to the carbon-carbon green body or itself is weaker than that of reactive silicon infiltration, and will not affect the strength of the material. damage, and the braking performance is stable without vibration, but the silicon carbide prepared by the precursor impregnation and cracking process is nano-scale, and the final material cannot be dense in surface, its friction coefficient is low, and the wet state attenuation is large, which is not suitable for high-energy applications load brake

Method used

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  • Preparation method and application of a carbon ceramic friction material
  • Preparation method and application of a carbon ceramic friction material

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Effect test

Embodiment 1

[0045] The carbon-ceramic sample that will be prepared in the embodiment 1 of the present invention, its green body used is that density is 1.28, 1.37g / cm 3 Two pieces of C / C composite material.

[0046] step one:

[0047] The impregnating solution is prepared according to the mass ratio of polymethylsilane: styrene = 100:30, and the C / C green body is placed in a metal impregnating tank, vacuum impregnated for 2 hours, and pressure impregnated for 6 hours. After the impregnation is completed, the impregnation liquid is released, and the impregnated green body is put into a graphite tooling and put into a cracking furnace at 900°C for cracking. The whole process is protected by a nitrogen atmosphere, and the above impregnation-cracking process is repeated twice. During vacuum impregnation, the vacuum degree is controlled to be ≤10Pa, and the pressurized impregnation pressure is 5.5MPa.

[0048] Step two:

[0049] heat treatment. The pre-finished product prepared in step 1 ...

Embodiment 2

[0062] The carbon-ceramic sample that will be prepared in the embodiment 2 of the present invention, its green body used is that density is 0.92, 1.05g / cm 3 Two pieces of C / C composite material.

[0063] step one:

[0064] The impregnating solution is prepared according to the mass ratio of polymethylsilane: styrene = 100:40, and the C / C green body is placed in a metal impregnating tank, vacuum impregnated for 3 hours, and pressure impregnated for 4 hours. After the impregnation is completed, the impregnation liquid is released, and the impregnated green body is put into a graphite tooling and put into a cracking furnace for cracking at 1000°C. The whole process is protected by a nitrogen atmosphere, and the above impregnation-cracking process is repeated 3 times.

[0065] During vacuum impregnation, the vacuum degree is controlled to be ≤10Pa, and the pressurized impregnation pressure is 4MPa.

[0066] Step two:

[0067] Carbon ceramic brake discs are heat treated. The p...

Embodiment 3

[0079] The carbon-ceramic sample that will be prepared in the embodiment 3 of the present invention, its green body used is that density is 1.42, 1.50g / cm 3 Two pieces of C / C composite material.

[0080] step one:

[0081] Prepare the impregnating solution according to the mass ratio of polymethylsilane: styrene = 100:20, put the C / C green body into the metal impregnation tank, adopt vacuum impregnation for 1 hour, and pressure impregnation for 6 hours. After the impregnation is completed, the impregnation liquid is released, and the impregnated green body is put into a graphite tooling and put into a cracking furnace at 800°C for cracking. The whole process is protected by a nitrogen atmosphere, and the above impregnation-cracking process is repeated 3 times.

[0082] During vacuum impregnation, the vacuum degree is controlled to be ≤10Pa, and the pressurized impregnation pressure is 6MPa.

[0083] Step two:

[0084]Carbon ceramic brake discs are heat treated. The pre-fi...

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Abstract

The invention discloses a preparation method and application of a carbon-ceramic friction material. The preparation method comprises the following steps: 3 The C / C composite material is a green body that undergoes PIP treatment, high temperature treatment, and RMI treatment in sequence to obtain a density of 1.9‑2.2g / cm 3 carbon-ceramic friction material; the RMI treatment process is to place the high-temperature-treated green body in a graphite mold paved with silicon powder and amorphous silicon carbide powder, and under vacuum conditions, the siliconization reaction, the non- Shaped silicon carbide powder is obtained by sintering silicon carbide ceramic precursors at 800-1000°C. The carbon-ceramic friction material prepared by the method of the present invention adjusts the particle size gradation and content of different silicon carbides in the material, and the obtained friction material has an adjustable and stable friction coefficient, a small amount of wear, no obvious vibration during the braking process, and the braking curve is rectangular. , stable, no tail warping, no large attenuation in the wet state after friction, suitable for brake discs required for the braking of aircraft, automobiles, heavy trucks, high-speed trains and other transportation systems.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon-ceramic friction material, belonging to the technical field of brake material development. Background technique [0002] Friction material (brake material) is a material that relies on its friction to perform braking and transmission functions, and its purpose is to improve friction and wear performance and thermal stability. Carbon-ceramic friction material is a carbon fiber-reinforced carbon-silicon carbide composite material, which is currently widely used as a brake material. As a brake material, its advantages lie in low density, good heat resistance, high and stable friction performance, and small wear. etc. Overcoming the poor adaptability of carbon / carbon brake materials to wet environments, it is recognized as a new type of brake material, and has a wide range of applications and prospects in high-energy brake fields such as aircraft, high-speed trains, and automobiles. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80F16D69/02
CPCC04B35/806F16D69/023F16D2200/0047F16D2200/0052F16D2200/0069F16D2200/0082C04B2235/77C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/483C04B2235/96
Inventor 张西岩薛珊燕黄能武
Owner HUNAN BOWANG CARBON CERAMIC CO LTD
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