A preparation method of silicon nitride@silicon carbide@boron nitride composite fiber felt

A composite fiber felt and carbon fiber felt technology, which is applied in the processing of textile materials, liquid/gas/vapor textile material processing, textiles and papermaking, etc. The effect of good application prospects

Active Publication Date: 2021-11-16
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 solves the problem that the service temperature of existing ceramic fiber materials is lower than 1200°C, and provides a preparation method of silicon nitride@silicon carbide@boron nitride composite fiber felt

Method used

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  • A preparation method of silicon nitride@silicon carbide@boron nitride composite fiber felt
  • A preparation method of silicon nitride@silicon carbide@boron nitride composite fiber felt
  • A preparation method of silicon nitride@silicon carbide@boron nitride composite fiber felt

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specific Embodiment approach 1

[0025] Specific embodiment one: In this embodiment, a method for preparing a silicon nitride@silicon carbide@boron nitride composite fiber felt is completed according to the following steps:

[0026] 1. Si 3 N 4 Preparation of fiber mat:

[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, and put the graphite crucible without the graphite crucible cover and containing the reactants into the tube furnace In the process, nitrogen gas is introduced at a flow rate of 60mL / min to 160mL / min as the reaction gas, and the temperature is raised to 1500°C to 1700°C at a heating rate of 1°C / min to 10°C / min, and at a reaction temperature of 1500°C to 1700 Under the condition of ℃, the sintering reaction is 90min to 240min, and after the reaction is completed, it is naturally cooled to room temperature to obtain Si 3 N 4 fibe...

specific Embodiment approach 2

[0041] 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 400g / m 2 ~1000g / m 2 carbon fiber felt; the thickness of the carbon fiber felt in the step 1 is 3 mm to 10 mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0042] 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

A method for preparing a silicon nitride@silicon carbide@boron nitride composite fiber mat, which relates to a method for preparing a composite fiber mat. The invention aims to solve the problem that the service temperature of the existing ceramic fiber material is lower than 1200°C. Preparation method: 1. Si 3 N 4 Preparation of fiber felt; 2. Wrapped carbon layer; 3. Si 3 N 4 Preparation of @SiC fiber mat; 4. Loading of BN layer. The invention is used for the preparation of silicon nitride@silicon carbide@boron nitride composite fiber felt.

Description

technical field [0001] The invention relates to a preparation method of a composite fiber mat. Background technique [0002] As a light and flexible refractory fiber heat insulation material commonly used at present, ceramic fiber felt has excellent thermal insulation performance and plays an important role in promoting the rapid development of aviation, aerospace, metallurgy, chemical industry, energy and other fields . High-temperature-resistant ceramic fiber materials are considered to be the most promising materials in harsh high-temperature environments. At present, the service temperature of ceramic fibers in the international market in an aerobic environment is generally lower than 1200°C. In order to meet the development needs of future equipment, it is urgent to develop new high-temperature resistant ceramic fiber materials. SiC and Si are currently commonly used in ultra-high temperature environments 3 N 4 Ceramic fibers, the service temperature of these two ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/573C04B35/583C04B35/591C04B35/584C04B35/622D06B3/10
CPCC04B35/573C04B35/583C04B35/591C04B35/62281C04B35/6229C04B35/62295C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/9607D06B3/10
Inventor 王志江兰晓琳
Owner HARBIN INST OF TECH
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