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Preparation method of carbon ceramic automobile brake disc

An automobile brake and carbon ceramic technology, applied in mechanical equipment, friction linings, gear shifting mechanisms, etc., can solve the problems of weak bonding ability, high braking coefficient, material strength damage, etc., to avoid uneven pore distribution and stable braking. The effect of improving performance and service life

Active Publication Date: 2019-10-25
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, and during the infiltration process, liquid silicon and pyrolytic carbon or some carbon fibers form an excessively strong interface, resulting in material strength damage
Therefore, the brake disc prepared by RMI has a high braking coefficient, and the vibration is relatively large during the braking process.
The PIP process can well eliminate the inhomogeneity caused by the carbon-carbon material during the preparation process, but the bonding ability of the silicon carbide generated by the cracking of the precursor to the carbon-carbon body or itself is weaker than that of the reactive silicon infiltration, so it is prepared by the PIP method. During the braking process, the brake disc has stable braking performance and no vibration, but its cost is high and the amount of wear is relatively large

Method used

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  • Preparation method of carbon ceramic automobile brake disc

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The carbon-ceramic automobile brake disk that will be prepared in the embodiment of the present invention 1, its green body used is that density is 0.93g / cm 3 C / C composite materials.

[0046] step one:

[0047] Prepare the impregnating solution I according to the mass ratio of polymethylsilane: styrene = 100:35, put the C / C body into a metal impregnation tank, vacuum impregnate for 1 hour, and pressurize for 5 hours. After the impregnation is completed, the impregnating solution I 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 an inert atmosphere, and the above impregnation-cracking process is repeated twice.

[0048] During vacuum impregnation, the vacuum degree is controlled to be ≤10Pa, and the pressurized impregnation pressure is 5MPa.

[0049] Step two:

[0050] The pre-finished product prepared in step 1 is subjected to high-temperature treatme...

Embodiment 2

[0066] The carbon-ceramic automobile brake disk that will be prepared in the embodiment of the present invention 1, its green body used is that density is 0.80g / cm 3 C / C composite materials.

[0067] step one:

[0068] According to the mass ratio of polymethylsilane: styrene = 100:40, configure the impregnating solution I, put the C / C green body into the metal impregnating tank, adopt vacuum impregnation for 1h, control the vacuum degree ≤ 10Pa, pressurize the impregnation for 4h, and control the pressure After the impregnation is completed, the impregnation solution 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 an inert atmosphere, and the above impregnation-cracking process is repeated 3 times.

[0069] Step two:

[0070] The pre-finished product prepared in step 1 is subjected to high-temperature treatment at 1500°C in a vacuum environment with a vacuum d...

Embodiment 3

[0086] The carbon-ceramic automobile brake disk that will be prepared in the embodiment of the present invention 3, its green body used is that density is 1.02g / cm 3 C / C composite materials.

[0087] step one:

[0088] 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 an inert atmosphere, and the above impregnation-cracking process is repeated twice.

[0089] During vacuum impregnation, the vacuum degree is controlled to be ≤10Pa, and the pressurized impregnation pressure is 6MPa.

[0090] Step two:

[0091] The pre-finished product prepared in step 1 is subjected to ...

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Abstract

The invention discloses a preparation method of a carbon ceramic automobile brake disc. The preparation method comprises the following steps that a C / C composite material with the density being 0.8-1.0 g / cm<3> is taken as a green body and sequentially subjected to PIP treatment, high-temperature treatment and RMI treatment, and namely a carbon ceramic composite material with the density being 1.9-2.0 g / cm<3> is obtained; penetrative low melting point metal treatment is conducted on the carbon ceramic composite material to obtain the carbon ceramic automobile brake disc, and the melting point of the low melting point metal is less than 1200 DEG C; and the process of the RMI treatment includes the steps the high-temperature treated green body is placed in a graphite mold paved with silicon powder and amorphous silicon carbide powder, under the vacuum condition, a siliconizing reaction is conducted, and the amorphous silicon carbide powder is obtained by sintering a silicon carbide ceramics precursor at 800-1000 DEG C. The preparation method of the carbon ceramic automobile brake disc with low cost, stable friction performance and excellent heat dispersion is provided.

Description

technical field [0001] The invention belongs to the field of brake material development, and in particular relates to a preparation method of a carbon-ceramic automobile brake disc. Background technique [0002] Carbon-ceramic materials are a new type of friction material that has emerged and developed in the past two decades. It has the advantages of low density, high temperature resistance, high and stable friction performance, and has broad application prospects in high-energy braking fields such as automobiles, high-speed trains, and aircraft. Compared with high-speed trains and airplanes, automobile brake discs are more inclined to functional requirements, and their friction performance has higher requirements on their service life, brake shock absorption, cost, etc. under the premise of ensuring safety. [0003] Carbon ceramic materials are mainly prepared by precursor impregnation pyrolysis (PIP) and reactive siliconization (RMI). At present, the preparation methods o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/573C04B35/577C04B35/80C04B35/622C04B41/88F16D69/02
CPCC04B35/806C04B35/571C04B35/573C04B35/622C04B41/88C04B41/515C04B41/5155C04B41/5127F16D69/02C04B2235/428C04B2235/616C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/77F16D2200/0047F16D2200/0082C04B41/4523C04B41/4515
Inventor 伍盼阳杨江赵倩倩
Owner HUNAN BOWANG CARBON CERAMIC CO LTD
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