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Self-bonding silicon carbide fireproof material and liquid phase sintering preparation method thereof

A refractory material and silicon carbide technology, which is applied in the field of self-bonding silicon carbide refractory material and its liquid phase sintering preparation, can solve the problems of limited ability to promote sintering, difficulty in effectively improving product strength and density, and achieve wettability Good, lower coefficient of thermal expansion, avoid the effect of loose combination

Active Publication Date: 2018-10-02
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the current preparation of self-bonded silicon carbide products, it is necessary to add a small amount of sintering aid to promote sintering, while most of the prior art is to add common oxides such as alkaline earth oxides (such as MgO) and silicon dioxide powder to promote sintering. The sintering ability is very limited, making it difficult to effectively improve the strength and density of the product.

Method used

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  • Self-bonding silicon carbide fireproof material and liquid phase sintering preparation method thereof
  • Self-bonding silicon carbide fireproof material and liquid phase sintering preparation method thereof
  • Self-bonding silicon carbide fireproof material and liquid phase sintering preparation method thereof

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Embodiment 1

[0021] 1. A kind of self-bonding silicon carbide refractory material in this embodiment, its raw material composition is:

[0022]

[0023] 2. The liquid phase sintering preparation method of the above-mentioned self-bonding silicon carbide refractory material in this embodiment is as follows:

[0024] After mixing the raw materials according to the above proportions, add a PVA solution (concentration of 5wt%) that is 8wt% of the total amount of raw materials and mix evenly. After entering the kiln, the moisture content is less than 0.5%, and then fired at a temperature of 1420 ° C for 2 hours to obtain self-bonded silicon carbide refractories, such as figure 1 As shown, the material structure is dense and the number of pores is small. The water absorption of the material is 2.6%.

Embodiment 2

[0026] 1. A kind of self-bonding silicon carbide refractory material in this embodiment, its raw material composition is:

[0027]

[0028] 2. The liquid phase sintering preparation method of the above-mentioned self-bonding silicon carbide refractory material in this embodiment is as follows:

[0029] After mixing the raw materials according to the above proportions, add a PVA solution (concentration of 5wt%) that is 10wt% of the total amount of raw materials and mix evenly. After entering the kiln, the moisture content is less than 0.5%, and then fired at a temperature of 1400°C for 1 hour to obtain a self-bonded silicon carbide refractory material.

Embodiment 3

[0031] 1. A kind of self-bonding silicon carbide refractory material in this embodiment, its raw material composition is:

[0032]

[0033] 2. The liquid phase sintering preparation method of the above-mentioned self-bonding silicon carbide refractory material in this embodiment is as follows:

[0034] After mixing the raw materials according to the above proportions, add a PVA solution (concentration of 5wt%) that is 9wt% of the total amount of raw materials and mix evenly. After entering the kiln, the moisture content is less than 0.5%, and then it is fired at a temperature of 1360°C for 1 hour to obtain a self-bonded silicon carbide refractory material.

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Abstract

The invention discloses a self-bonding silicon carbide fireproof material which is composed of 55-75wt% of silicon carbide, 6-35wt% of metal silicon powder, 9-20wt% of silicious alloy powder, 0-6wt% of graphite powder and 1-3wt% of rare earth oxide. Externally-added corresponding metal element is dissolved in the silicious alloy powder to serve as a metal sintering aid which is 0.1-2wt% of the silicious alloy powder. In addition, the invention further discloses a liquid phase sintering preparation method of the self-bonding silicon carbide fireproof material. By introducing the rare earth oxide and the metal sintering aid, catalytic effect of the rare earth oxide and the metal sintering aid and a liquid phase formed by the same at high temperature are utilized to bond silicon carbide aggregate granules together to promote sintering, so that quality and performance of the self-bonding silicon carbide fireproof material are improved effectively. Compared with existing solid-phase sintering processes, a liquid-phase sintering method is easier to realize and more conducive to improving product quality and performance, so that the fireproof material is conducive to popularization and application.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a self-bonding silicon carbide refractory material and a liquid-phase sintering preparation method thereof. Background technique [0002] Self-bonded silicon carbide refractories use coarse silicon carbide particles as the aggregate, metal silicon powder, carbon black, graphite and other carbon sources as the matrix, and synthesize β-SiC in situ under the conditions of buried powder sintering or vacuum sintering as the binding phase. Silicon carbide refractory products have the advantages of high strength, high thermal conductivity, good fire resistance, high creep resistance, good thermal stability and good chemical stability, etc., and can serve in high temperature for a long time, so they are used in metallurgy, It has been widely used in the fields of daily use and architectural ceramics, and the material is widely used in foreign large-scale blast fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 江伟辉劳新斌梁健徐贵荣苗立峰包镇红李亚格
Owner JINGDEZHEN CERAMIC INSTITUTE