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A carbon-ceramic brake pad for high-speed trains and its preparation method

A technology for brake pads and high-speed trains, applied to friction linings, mechanical equipment, etc., can solve problems such as difficulty in meeting braking requirements and low mechanical properties of materials, avoiding graphitization treatment, high friction coefficient, and friction coefficient. and stable effect

Active Publication Date: 2015-09-30
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention patent (Patent No.: ZL200710035176.0) of "Manufacturing Method of Carbon / Carbon-Silicon Carbide Composite Brake Shoe" applied by the applicant in the previous period is mainly for chopped carbon fiber, silicon carbide powder, graphite powder, industrial silicon Powder and binder are used as raw materials, and the preparation method of C / C-SiC friction material prepared by warm-pressing-in-situ reaction method has applied for patent protection. Since this method uses short carbon fibers as reinforcements, the mechanical properties of the material are relatively low , it is difficult to meet the braking requirements of high-speed trains with a speed of 200Km / h and above

Method used

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  • A carbon-ceramic brake pad for high-speed trains and its preparation method
  • A carbon-ceramic brake pad for high-speed trains and its preparation method
  • A carbon-ceramic brake pad for high-speed trains and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] (1) Use the PAN type T700 (12K) carbon fiber produced by Japan's Toray Corporation (Toray) to make the net tire and no-weft fabric, and use a single layer of 0° no weft fabric, net tire layer, 90° no weft fabric, and net tire The layers are superimposed in sequence, and then the density is 0.52g / cm2 using the method of relay acupuncture 3 carbon fiber felt;

[0059] (2) Under an argon atmosphere, the carbon fiber felt is subjected to a high-temperature heat treatment at 1600°C for 20 hours, and the control pressure is 0.1Mpa during the high-temperature heat treatment;

[0060] (3) Put the heat-treated carbon fiber mat into the deposition furnace, use natural gas as the carbon source gas, hydrogen as the dilution gas, the volume ratio of natural gas and hydrogen is 1:3, and deposit at 1000 ° C by thermal gradient chemical vapor deposition Pyrolytic carbon matrix with a density of 1.32 g / cm after 300 hours of deposition 3 Low-density C / C porous body material, when depos...

Embodiment 2

[0071] (1) Use the PAN type T700 (12K) carbon fiber produced by Japan's Toray Corporation (Toray) to make the net tire and no-weft fabric, and use a single layer of 0° no weft fabric, net tire layer, 90° no weft fabric, and net tire The layers are stacked in sequence, and then the density is 0.55g / cm 3 carbon fiber felt;

[0072] (2) Under a nitrogen atmosphere, the carbon fiber felt is subjected to a high-temperature heat treatment at 1600°C for 18 hours, and the control pressure is 0.12Mpa during the high-temperature heat treatment;

[0073] (3) Put the heat-treated carbon fiber mat into the deposition furnace, use propylene as the carbon source gas, and hydrogen as the dilution gas. The volume ratio of propylene to hydrogen is 1:2, and the thermal gradient chemical vapor deposition method is used at 1100 ° C. The pyrolytic carbon substrate was deposited under the bottom, and the density was 1.43g / cm3 after 380 hours of deposition 3 The C / C porous body material, when depos...

Embodiment 3

[0086] (1) The PAN type XK-12-1 (12K) carbon fiber produced by Dalian Xingke Carbon Fiber Co., Ltd. is used to make the net tire and no weft cloth, and the single layer of 0° no weft cloth, net tire layer, and 90° no weft cloth , Mesh tire layers are stacked in turn, and then made by relay acupuncture method with a density of 0.20g / cm 3 carbon fiber felt;

[0087] (2) Under a nitrogen atmosphere, the carbon fiber felt is subjected to a high-temperature heat treatment at 1600°C for 5 hours, and the control pressure is 0.2Mpa during the high-temperature heat treatment;

[0088] (3) Put the heat-treated carbon fiber felt into the deposition furnace, use natural gas as the carbon source gas, hydrogen as the dilution gas, the volume ratio of natural gas and hydrogen is 1:1, and use thermal gradient chemical vapor deposition method to deposit at 1100 °C Pyrolytic carbon matrix with a density of 1.0 g / cm produced after 220 hours of deposition 3 Low-density C / C porous body material,...

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Abstract

The invention relates to a carbon ceramic braking pad for a high-speed train and a preparation method of the carbon ceramic braking pad. The carbon ceramic braking pad is made of carbon ceramic composite material; the carbon ceramic composite material comprises the following components in percentage by mass: 16-30 percent of carbon fibers, 20-36 percent of pyrolytic carbon, 28-46 percent of silicon carbide, 6-12 percent of molybdenum disilicide and 2-6 percent of simple substance silicon; the density of the carbon ceramic composite material is 1.8-2.4g / cm<3>; the carbon fibers are uniformly distributed in the carbon ceramic composite material in a three-dimensional network structure. According to the invention, after the high-temperature heat treatment is performed on a carbon fiber felt with the density of 0.20-0.65g / cm<3>, the pyrolytic carbon is generated in the carbon fiber felt through the thermal-gradient chemical vapor deposition carburizing treatment, then the catalytic graphitization treatment, non-immersion type melting infiltration and assembly are performed, so that the carbon ceramic braking pad for the high-speed train is obtained.The carbon ceramic braking pad is simple in preparation technology, moderate in friction coefficient, good in abrasion performance, stable in braking and strong in environmental suitability and can meet braking requirements of the high-speed train with the speed of 200Km / h.

Description

technical field [0001] The invention relates to a brake pad and a preparation method thereof, in particular to a carbon ceramic brake pad for high-speed trains and a preparation method thereof. Background technique [0002] With the strengthening of my country's train to high-speed development trend, the development of its consumable parts - brake pads has become one of the key technologies for localization. When a high-speed train brakes, most of its kinetic energy is converted into heat energy, which makes the temperature of the friction surface of the brake pad and the brake disc reach as high as 500°C, and the local flash point temperature can reach 1000°C. Therefore, the requirements for brake pads of high-speed trains are getting higher and higher. [0003] At present, high-speed train brakes mainly use resin synthetic brake pads and powder metallurgy brake pads. Due to the low thermal conductivity of the material, the resin composite brake pads are prone to carboniza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/02C08J5/14
Inventor 肖鹏黄伯云李专
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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