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A kind of preparation method of b4c modified c/c-sic brake material

A brake material and modification technology, which is applied in the field of preparation of B4C modified C/C-SiC brake material, can solve problems such as not being able to withstand the brake demand, achieve the effects of improving friction and wear performance, preventing oxidative wear, and increasing specific heat capacity

Active Publication Date: 2019-06-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the high-speed rail wants to speed up again, the powder metallurgy or steel brake materials currently used can no longer withstand the braking requirements in emergency situations.

Method used

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  • A kind of preparation method of b4c modified c/c-sic brake material
  • A kind of preparation method of b4c modified c/c-sic brake material
  • A kind of preparation method of b4c modified c/c-sic brake material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1, preparation of C fiber preform:

[0028] Firstly, PAN-based T-300 (6~50K) carbon fiber is made into short-fiber tire mesh and non-weft fabric, and then the single-layer 0° non-weft fabric, tire mesh, 90° non-weft fabric, and tire mesh are stacked in sequence , and then use acupuncture technology to make the non-woven fabric and tire net into one. According to the required thickness, after repeated lamination, acupuncture, lamination, acupuncture..., a three-dimensional acupuncture carbon fiber prefabricated body is obtained. The preform density is about 0.55g / cm 3 , the tire mesh layer density is about 0.2g / cm 3 , the density of the non-weft layer is about 0.6g / cm 3 , the volume content of carbon fiber is about 40%, and the layer density is about 14 layers / 10mm.

[0029] Step 2, B 4 Preparation of C slurry:

[0030] Add 0.5wt% CMC (sodium carboxymethyl cellulose) to distilled water, mix well and adjust the pH value to 11-12 with ammonia water and hydrochlo...

Embodiment 2

[0048] Step 1, preparation of C fiber preform:

[0049] Firstly, PAN-based T-300 (6~50K) carbon fiber is made into short-fiber tire mesh and non-weft fabric, and then the single-layer 0° non-weft fabric, tire mesh, 90° non-weft fabric, and tire mesh are stacked in sequence , and then use acupuncture technology to make the non-woven fabric and tire net into one. According to the required thickness, after repeated lamination, acupuncture, lamination, acupuncture..., a three-dimensional acupuncture carbon fiber prefabricated body is obtained. The preform density is about 0.55g / cm 3 , the tire mesh layer density is about 0.2g / cm 3 , the density of the non-weft layer is about 0.6g / cm 3 , the volume content of carbon fiber is about 40%, and the layer density is about 14 layers / 10mm.

[0050] Step 2, B 4 Preparation of C slurry:

[0051] Add 1.0wt% CMC (sodium carboxymethylcellulose) in distilled water, mix well and adjust the pH value to 11~12 with ammonia water and hydrochlor...

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Abstract

The invention relates to a preparation method of a B4C modified C / C-SiC brake material. According to the method, a vacuum pressure dipping method is used for introducing a B4C powder material in a three-dimensional needle carbon felt with the initial density being 0.4 to 0.6g / cm<3>; CVI (chemical vapor infiltration) and RMI (reaction melt infiltration) are combined for preparing the C / C-SiC brake material. When the B4C modified C / C-SiC brake material is used, on one hand, the B4C is used as a self heeling component for achieving the protection effects on the carbon fiber and a carbon base body; the inoxidizability of the material can be obviously improved; on the other hand, the B4C has higher specific heat capacity; the integral specific heat capacity of the material can be improved; the braking temperature can be effectively reduced; the material friction performance stability is improved.

Description

technical field [0001] The invention belongs to the preparation method of C / C-SiC composite material, relates to a kind of B 4 The preparation method of C modified C / C-SiC brake material is a kind of adopting vacuum pressure impregnation to B 4 C powder is introduced into the three-dimensional needle-punched carbon fiber preform, and B is prepared by chemical vapor deposition combined with reactive melt infiltration process 4 C Modified method of C / C-SiC brake material. Background technique [0002] The brake device is the core component for aircraft, high-speed rail, and automobiles to achieve braking and ensure safe operation. It mainly converts kinetic energy into heat energy through the relative motion of the friction surface to achieve the purpose of braking. During the braking process, the brake device converts huge kinetic energy into heat energy in a very short time and dissipates it. [0003] Literature Krenkel W.Cost Effective Processing of Cmc Composites by Mel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/80C04B35/573
CPCC04B35/573C04B35/806C04B35/83C04B2235/3821C04B2235/5248C04B2235/5256C04B2235/614C04B2235/616
Inventor 范尚武何留洋杨川成来飞张立同王胜李恒林洋港邹壁卉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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