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A kind of preparation method of high-purity α-phase silicon nitride fiber felt

A technology of phase silicon nitride and fiber felt, which is applied in the field of preparation of high-purity α-phase silicon nitride, can solve the problems of high cost and lack of high-purity silicon nitride raw material powder, and achieve low price and high content of α-phase , the effect of easy access to raw materials

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

[0005] The present invention solves the problem of lack of high-purity silicon nitride raw material powder and high cost, and provides a method for preparing high-purity α-phase silicon nitride fiber felt

Method used

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  • A kind of preparation method of high-purity α-phase silicon nitride fiber felt
  • A kind of preparation method of high-purity α-phase silicon nitride fiber felt
  • A kind of preparation method of high-purity α-phase silicon nitride fiber felt

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specific Embodiment approach 1

[0027] DETAILED DESCRIPTION one: one kind of the present embodiment, high purity α-phase preparation of silicon nitride fiber mat, which is done by the following steps:

[0028] A, preparing a carbon fiber mat precursors:

[0029] The carbon fiber mat was immersed in the mass percentage is 5% to 20% nitrate catalyst solution, the immersion time of 2h ~ 48h, and then dried in an oven to obtain a carbon fiber mat precursor;

[0030] Second, the sintering reaction:

[0031] Graphite crucible and the reaction of the silicon source powder laid on the crucible bottom of the graphite crucible to obtain reaction of the silicon source layer, and the carbon fiber mat precursor covers the upper surface of the reaction of the silicon source layer, filled with the reaction product was placed in a tube furnace at a flow rate of 0.05L / min ~ 2L / min nitrogen gas as the reaction gas, the reaction temperature is at 1200 ℃ ~ 1800 ℃ under sintering reaction 0.5h ~ 24h, allowed to cool to room temp...

specific Embodiment approach 2

[0045]DETAILED DESCRIPTION OF THE INVENTION Different: The present embodiment differs from the specific embodiment that the nitrate catalyst solution described in step one is a nitrate solution, a cobalt nitrate solution or a copper nitrate solution. Others are the same as those of the specific embodiments.

specific Embodiment approach 3

[0046] DETAILED DESCRIPTION OF THE INVENTION 3: The present embodiment is different from one or two of the specific embodiment: The drying of the drying temperature in the oven is in the oven, drying 2H ~ 12H under conditions of the drying temperature of 40 ° C to 180 ° C. . Others are the same as those of the specific embodiments.

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Abstract

The invention discloses a method for preparing high-purity α-phase silicon nitride fiber felt, which relates to a method for preparing high-purity α-phase silicon nitride. The invention aims to solve the problems of lack of high-purity silicon nitride raw material powder and high cost. Preparation method: 1. Preparation of carbon fiber felt precursor; 2. Sintering reaction; 3. Carbon removal treatment. The invention is used for the preparation of high-purity α-phase silicon nitride fiber felt.

Description

Technical field [0001] The present invention relates to a method for preparing high-purity α-phase silicon nitride. Background technique [0002] Silicon nitride is a comprehensive performance excellent high temperature structural ceramic material because of its high strength, high hardness, temperature resistance, high temperature at 1400 deg.] C still has ultra-high strength, far more than other ceramic material, often used as high temperature heat engine components, cutting tools and the like. While silicon nitride has good chemical stability, high thermal conductivity is desirable, good insulation and high temperature dielectric properties, may be used as an integrated circuit board and aircraft, missile radome material. [0003] Is covalently bonded silicon nitride, sintered large difficulty, for the preparation of high performance silicon nitride ceramic raw material powder demanding, so that the arrangement of atoms with [alpha] decreased symmetry, internal strain large, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/65
CPCC04B35/591C04B2235/3418C04B2235/428C04B2235/46C04B2235/5248C04B2235/96
Inventor 王志江戴丁
Owner HARBIN INST OF TECH
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