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Preparation method of 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 problems that cannot meet the working conditions of amphibious aircraft

Inactive Publication Date: 2020-01-21
HUNAN BOYUN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Still can't meet the operating conditions of amphibious aircraft

Method used

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  • Preparation method of carbon-ceramic friction material
  • Preparation method of carbon-ceramic friction material
  • Preparation method of carbon-ceramic friction material

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preparation example Construction

[0035] The invention provides a method for preparing a carbon-ceramic friction material, comprising the following steps:

[0036] A) Using propylene as the carbon source and nitrogen as the dilution gas, the C / C preform is densified by chemical vapor deposition, and then subjected to graphitization heat treatment to obtain the C / C matrix;

[0037] B) immersing the C / C matrix in the impregnation solution, impregnating it under vacuum conditions, and then performing heat curing, high temperature carbonization treatment and graphitization treatment in sequence to obtain the C / C porous matrix;

[0038] C) processing several grooves on the friction surface of the C / C porous matrix;

[0039] D) performing siliconization on the processed C / C porous substrate obtained in step C) by embedding infiltration process to obtain a siliconized substrate;

[0040] E) immersing the siliconized substrate into the coating solution to impregnate the coating, and then raise the temperature to perf...

Embodiment 1

[0076] Step 1 Preparation of C / C preform

[0077] The carbon content of the untwisted PAN carbon fiber should not be less than 92%. The prefabricated body adopts a layer of PAN carbon fiber non-weft cloth and a layer of carbon fiber thin mesh tires alternately laid, that is, 1.X+1.Y method of continuous needle punching, and the non-weft cloth is 0° / 90° / 270 ° Angle layup. The interlayer density is 15±1 layer / cm; the acupuncture row distance and spacing are ≤2mm; the acupuncture density is controlled at 20-25 needles / cm 2 within range. Ratio of long fiber without weft cloth to thin mesh tire: long fiber without weft cloth 75±2%, thin mesh tire 25±2%. Preform bulk density: 0.60±0.02g / cm 3 .

[0078] Step 2 Preparation of C / C matrix

[0079] Perform CVD densification on the preform in step 1, using propylene gas as the carbon source and nitrogen as the dilution gas. During CVD, control the furnace pressure to 1.0KPa and temperature to 980°C; the volume ratio of propylene gas...

Embodiment 2

[0096] The C / SiC brake disc was prepared according to the method in Example 1, except that in this example, three grooves were made for each brake disc of the brake pair.

[0097] The braking curve with 3 grooves in this embodiment is not significantly different from the braking curve with 6 grooves in Embodiment 1, and the wet braking performance does not attenuate or attenuates less than 3%.

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Abstract

The invention provides a preparation method of a carbon-ceramic friction material, which comprises the following steps: A) with propylene as a carbon source and nitrogen as a diluent gas, carrying outchemical vapor deposition densification on a C / C preform, and carrying out graphitization heat treatment to obtain a C / C matrix; B) immersing the C / C matrix into the impregnation liquid for impregnation under a vacuum condition, and then sequentially carrying out heating curing, high-temperature carbonization treatment and graphitization treatment to obtain a C / C porous matrix; C) processing a plurality of grooves on the friction surface of the C / C porous substrate; D) siliconizing the processed C / C porous matrix obtained in the step C) by adopting an embedding method infiltration process toobtain a siliconized matrix; and E) immersing the siliconized matrix into a coating solution, carrying out coating impregnation, and heating the matrix for curing treatment to obtain the carbon-ceramic friction material. The wet attenuation of the friction material prepared by the method is less than or equal to 5%, so that the friction material completely satisfies the use conditions of amphibious aircrafts.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a preparation method of a carbon ceramic friction material. Background technique [0002] At present, there are many methods for preparing C / SiC friction materials, such as precursor dipping and cracking method, plasma spraying method, vapor deposition method, reaction infiltration method and so on. The carbon-ceramic brake materials prepared by these methods can basically solve the braking problems of most airplanes, high-speed trains and automobiles. However, for amphibious aircraft, its brake discs are soaked in water for a long time, so it has higher requirements for wet braking performance. At present, the porosity of the friction material prepared by the carbon ceramic preparation technology is generally ≤10%. At present, there is no carbon ceramic preparation technology that can achieve an almost completely dense brake material. It is also difficult to prepare ...

Claims

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Application Information

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IPC IPC(8): C04B35/573C04B35/80C04B35/622C04B41/85F16D69/02
CPCC04B35/573C04B35/622C04B41/85C04B41/5035F16D69/02C04B2235/428C04B2235/5436C04B2235/614C04B2235/616F16D2200/0047C04B41/5031C04B41/4922C04B41/4539C04B41/4515
Inventor 陈灵涛吴志远熊杰张红波
Owner HUNAN BOYUN NEW MATERIALS
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