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Method for making braking shoe and piece of charcoal/charcoal-silicon carbonate composite material

A composite material and manufacturing method technology, applied in the direction of friction linings, mechanical equipment, etc., can solve the problems of bubbling and cracking of the green body, and achieve the effects of reducing processing strength, improving friction coefficient and lowering cost.

Inactive Publication Date: 2007-11-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention patent is only applicable to friction area less than 60cm 2 , the manufacture of brake linings with a thickness less than 1.5cm. For brake shoe brake linings larger than this size, when this method is used to manufacture, the green body is prone to bubbling and cracking during the manufacturing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Using the technology of the present invention, the C / C-SiC composite material brake pads for large-scale port machinery are manufactured, and the friction area of ​​the brake pads is 105cm 2 , thickness 1.4cm.

[0017] The raw materials are chopped carbon fibers with a length of 2-8 mm, graphite powder with a particle size of 0.10 mm, Si powder with a particle size of 0.075 mm, and phenolic resin powder with a particle size of 0.10 mm.

[0018] The ratio of raw materials is 10% (mass content) of short carbon fiber, 36% (mass content) of Si powder, 30% (mass content) of carbon powder, and 24% (mass content) of phenolic resin powder. Load the weighed raw materials into the mixer for mixing.

[0019] The mixed raw materials are mechanically granulated, and the particle size is between 5 and 10 mm. Put the granules into the mold cavity, apply a pressure of 185MPa, keep warm at 180°C for 0.5 hours, and hot press the raw materials into a brake blank. The green body was sin...

Embodiment 2

[0024] The C / C-SiC composite material brake pads for train locomotives were manufactured by using this technology, and the brake pad friction area is 185cm 2 , thickness 2.3cm.

[0025] The raw materials are chopped carbon fibers with a length of 10-15mm, graphite powder with a particle size of 0.15mm, Si powder with a particle size of 0.15mm, phenolic resin powder with a particle size of 0.10mm, and SiC powder with a particle size of 0.10mm.

[0026] The proportioning of raw material is short carbon fiber 16% (mass content), Si powder 27% (mass content), carbon powder 23% (mass content), phenolic resin powder 22% (mass content), SiC powder 12% (mass content) ). Load the weighed raw materials into the mixer for mixing.

[0027] The mixed raw materials are mechanically granulated, and the maximum particle size is less than 15mm. Put the granules into the mold cavity, apply a pressure of 320MPa, keep warm at 180°C for 0.7 hours, and hot press the raw materials into a brake bl...

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Abstract

A preparation method of carbon / carbon-silicon carbide composite brake shoes and pads, the present invention produces C / C-SiC composite brake shoes and pads by several processes of mixing material, granulating, low-temperature hot embossing, high-temperature sintering, resin-impregnated solidifying, carbonizing, and buffing friction surface. The present invention, taking short carbon fiber as reinforced phase, can greatly reducing the cost comparing to those taking carbon fiber integer felt as reinforced phase; moreover, the content of various components can be effectively controlled by taking hot embossing; Adding SiC powder into raw material previously, can effectively increase the friction coefficient of brake shoes and pads, can achieve net-shape forming, can obviously reduce processing strength; Processing the mixture into irregular-appearance particles, and low-temperature hot embossing then, can effectively solve the bubbling and cracking problems of hot-embossed green body in sequent processes and decrease reject ratio.

Description

technical field [0001] The invention relates to a method for manufacturing carbon / carbon-silicon carbide (C / C-SiC) brake shoe pads. The manufacturing method can be used for the manufacture of brake shoes and brake pads of trains, subways and engineering machinery, drum brake pads and disc brake pads of automobiles, and the like. Background technique [0002] Carbon fiber reinforced C-SiC (i.e. C / C-SiC) composite material as a brake material has a low density (≤2.4g.cm -3 ), good wear resistance, high friction coefficient, smooth braking, corrosion resistance, oxidation resistance, high temperature resistance, strong environmental adaptability (such as friction coefficient does not decline in wet state) and long life, etc., is a high-performance Materials for brake pads. [0003] The methods for preparing C / C-SiC brake materials mainly include chemical vapor infiltration method, precursor impregnation cracking method, molten Si infiltration method, hot pressing-sintering me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/14F16D69/00F16D69/02
Inventor 肖鹏
Owner CENT SOUTH UNIV
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