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A kind of preparation method of silicon carbide/silicon nitride composite fiber felt

A composite fiber mat and carbon fiber mat technology, which is applied in the field of composite fiber mat preparation, can solve the problems of poor thermal insulation performance of products, difficulty in obtaining quantity demand, long thermal insulation time, etc., and achieves easy industrial production and thermal insulation performance. Improved, low-cost effects

Active Publication Date: 2021-11-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention will solve existing preparation SiC / Si 3 N 4 Composite materials or long heat preservation time, Si in the product 3 N 4 It is difficult to obtain the quantity requirement, or there is a problem of low output and poor heat insulation performance of the product, and a method for preparing a silicon carbide / silicon nitride composite fiber mat is provided

Method used

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  • A kind of preparation method of silicon carbide/silicon nitride composite fiber felt
  • A kind of preparation method of silicon carbide/silicon nitride composite fiber felt
  • A kind of preparation method of silicon carbide/silicon nitride composite fiber felt

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specific Embodiment approach 1

[0025] Specific embodiment one: present embodiment a kind of preparation method of silicon carbide / silicon nitride composite fiber mat, it is finished according to the following steps:

[0026] 1. Preparation of SiC fiber felt:

[0027] Put the reactive silicon source powder on the bottom of the graphite crucible to obtain the reactive silicon source layer, then cover the surface of the reactive silicon source layer with carbon fiber felt, cover the graphite crucible cover, and put the graphite crucible containing the reactants into the sintering furnace , at a flow rate of 20mL / min to 50mL / min, argon is introduced as a protective gas, and the temperature is raised to 1200°C to 1600°C at a heating rate of 2.5°C / min to 5°C / min, and the reaction temperature is 1200°C to 1600 Under the condition of ℃, the sintering reaction is 30min~180min, and it is naturally cooled to room temperature to obtain the SiC fiber mat;

[0028] The mass ratio of described carbon fiber felt and react...

specific Embodiment approach 2

[0047] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the carbon fiber felt described in step one has a unit mass of 500g / m 2 ~800g / m 2 carbon fiber mat; the thickness of the carbon fiber mat described in step 1 is 3 mm to 10 mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the reaction silicon source powder described in step one is the molar ratio of 1: (1~6) silicon dioxide powder and silicon powder mixture. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a silicon carbide / silicon nitride composite fiber mat, which relates to a method for preparing a composite fiber mat. The present invention requires existing preparation of SiC / Si 3 N 4 Composite materials or long heat preservation time, Si in the product 3 N 4 It is difficult to obtain the quantity requirement, or there is a problem of low output and poor heat insulation performance of the product. Preparation method: 1. Preparation of SiC fiber felt; 2. SiC / Si 3 N 4 Composite fiber felt. The invention is used for the preparation of silicon carbide / silicon nitride composite fiber felt.

Description

technical field [0001] The invention relates to a preparation method of a composite fiber mat. Background technique [0002] Solid materials with low density and thermal conductivity and excellent thermal insulation properties have become the preferred thermal insulation materials for thermal protection systems of hypersonic vehicles. SiC / Si 3 N 4 Composite materials have attracted widespread attention due to their high strength, good thermal shock stability, good oxidation resistance and excellent corrosion resistance. At present, it has been widely used in key parts of high temperature fields such as metallurgy, aviation, aerospace, chemical industry and energy. SiC and Si 3 N 4 All have many good physical and chemical properties, such as high strength and hardness, excellent oxidation resistance, stable chemical properties under high temperature environment, etc., and maintain high bond and strength at high temperature, without obvious decrease in strength, and The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/573C04B35/591C04B35/622
CPCC04B35/573C04B35/591C04B35/62281C04B35/62295C04B2235/6562C04B2235/6567C04B2235/9607
Inventor 王志江
Owner HARBIN INST OF TECH