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Preparation method of silicon nitride combined silicon carbide friction material

A friction material, silicon carbide technology, applied in the field of ceramic materials, can solve problems such as howling, unstable friction curve, and large vibration

Active Publication Date: 2020-01-14
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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  • Preparation method of silicon nitride combined silicon carbide friction material
  • Preparation method of silicon nitride combined silicon carbide friction material
  • Preparation method of silicon nitride combined 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 invention provides a C / SiC-Si3N4 friction material preparation method, which comprises: A) sequentially carrying out CVD densification and heat treatment on a C / C preform by using propylene as a carbon source and using nitrogen as a dilution gas to obtain a C / C porous matrix; B) siliconizing the C / C porous matrix by adopting an embedding method infiltration process to obtain a siliconized matrix; C) embedding the siliconized matrix into ceramic powder, and performing nitriding treatment in a nitrogen atmosphere to obtain a nitrided matrix; and D) immersing the nitrided matrix into a coating impregnation liquid, carrying out impregnation under a vacuum condition, and then carrying out curing treatment to obtain the C / SiC-Si3N4 friction material, wherein the coating impregnation liquid comprises a liquid A and a liquid B. According to the invention, the nitriding treatment process is added on the basis of the embedding method infiltration process, the friction surface is densified, the porosity is less than or equal to 5%, and the wet brake performance 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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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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