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A kind of preparation method of silicon nitride bonded silicon carbide friction material

A friction material, silicon carbide technology, applied in the field of ceramic materials, can solve the problems of whistling, large vibration, unstable friction curve, etc.

Active Publication Date: 2022-04-05
HUNAN BOYUN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the C / SiC friction material has a series of excellent friction characteristics, there are still problems such as large vibration, unstable friction curve, and howling.

Method used

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  • A kind of preparation method of silicon nitride bonded silicon carbide friction material
  • A kind of preparation method of silicon nitride bonded silicon carbide friction material
  • A kind of preparation method of silicon nitride bonded silicon carbide friction material

Examples

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preparation example Construction

[0037] The invention provides a silicon nitride bonded silicon carbide (C / SiC-Si 3 N 4 ) a method for preparing a friction material, comprising the following steps:

[0038] A) Using propylene as the carbon source and nitrogen as the dilution gas, the C / C preform is subjected to CVD densification and heat treatment in sequence to obtain a C / C porous matrix;

[0039] B) Silicating the C / C porous matrix using an embedding infiltration process to obtain a siliconized matrix;

[0040] C) embedding the siliconized matrix in ceramic powder, and performing nitriding treatment in a nitrogen atmosphere to obtain a nitrided matrix;

[0041] D) The nitrided substrate is immersed in the coating impregnation solution, impregnated under vacuum conditions, and then cured to obtain C / SiC-Si 3 N 4 friction material;

[0042] The coating immersion liquid includes liquid A and liquid B, and the liquid A includes components in the following molar ratios: aluminum isopropoxide: tetraethyl ort...

Embodiment 1

[0081] Step 1 Preparation of C / C preform

[0082] 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 laminated, that is, 1.X+1.Y method of continuous needle punching, and the non-weft cloth is 0 up and down. 0 / 90 0 / 270 0Corner plies. 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 .

[0083] Step 2 Preparation of C / C porous matrix

[0084] Perform CVD densification on the prefabricated body in step 1, use propylene gas as the carbon source, and nitrogen as the dilution gas. During CVD, control the furnace pressure to 1.0-1.2KPa and the temper...

Embodiment 2

[0097] Prepare C / SiC-Si according to the method in Example 1 3 N 4 The brake disc is different in that the nitriding temperature in this embodiment is 1300°C.

[0098] Sample detection Si 3 N 4 The content is 0.3%, the weight loss is 1%, and there is a howling during the braking process.

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Abstract

The present invention provides a C / SiC‑Si 3 N 4 A method for preparing a friction material, comprising the following steps: A) using propylene as a carbon source and nitrogen as a diluent gas, performing CVD densification and heat treatment on a C / C preform in sequence to obtain a C / C porous matrix; B) combining C / C C porous substrate is siliconized by embedding method infiltration process to obtain siliconized substrate; C) embed the siliconized substrate in ceramic powder, and carry out nitriding treatment under nitrogen atmosphere to obtain nitrided substrate; D) The nitrided substrate is immersed in the coating impregnation solution, impregnated under vacuum conditions, and then cured to obtain C / SiC-Si 3 N 4 Friction material; the coating impregnating liquid includes liquid A and liquid B. The present invention adds a nitriding treatment process on the basis of the embedding method infiltration process, and densifies the friction surface so that the porosity is ≤5%, and the braking performance in wet state is attenuated by 6%-13%.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a method for preparing a silicon nitride-bonded silicon carbide friction material. Background technique [0002] C / SiC friction material is a high-performance friction material developed on the basis of C / C materials. Compared with powder metallurgy friction materials, it has low density, light weight, small deformation, and excellent heat crack resistance. Compared with C / C friction materials, its wet friction performance has a small attenuation and a large static friction coefficient. The C / C friction material can obtain stable braking ability at high temperature, but cannot obtain stable braking ability at low temperature. C / SiC friction material not only has stable braking ability at high temperature, but also very stable braking ability at low temperature. [0003] At present, there are many methods for preparing C / SiC friction materials, such as precursor dippin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/52C04B35/573C04B35/591
CPCC04B35/52C04B35/573C04B35/591C04B2235/3826C04B2235/3873C04B2235/422C04B2235/5248C04B2235/3418C04B2235/3217C04B2235/656C04B2235/6567C04B2235/658C04B2235/5436C04B2235/96
Inventor 陈灵涛吴志远熊杰张红波
Owner HUNAN BOYUN NEW MATERIALS
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