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Oxide ceramics multiple phase refractory material

A technology for oxide ceramics and refractory materials, applied in the field of refractory ceramic materials, can solve the problems of complex process, high production cost and high raw material cost, and achieve the effects of pure composition, high service temperature and moderate density

Inactive Publication Date: 2007-02-28
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the β-Sialon matrix phase powder is first synthesized, and then combined with corundum particle-grade ingredients to form a β-Sialon-bonded corundum composite refractory ceramic material. The process is relatively complicated, energy consumption is large, and production costs are high.
Chinese Invention Patent Announcement CN1223550C proposes to use metal silicon, aluminum alloy powder, etc. as the main raw material to mix with brown corundum pellets and then melt or sinter to form a sialon bonded corundum refractory material. The preparation process is completed in one step reaction, but the raw material cost Higher, it is difficult to control the nitriding solid solution reaction of aluminum and silicon near the melting point
However, β-Sialon combined with mullite composite refractory ceramic materials has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select first-grade Suzhou kaolin, pure coal powder, adjust Si with silicon dioxide powder according to chemical composition analysis results 6-Z al Z o Z N 8-Z The silicon / aluminum ratio reaches Z value of 1.5, the weight percentage of clay raw material and carbon powder is 1:0.26, and then 0.7wt% zirconia reactive sintering accelerator is added, and the matrix raw material is formed after being mixed evenly. Then the corundum granules of 40#, 80# and 240# are mixed according to the ratio of 6:2:2 by weight percentage, wherein the raw material for forming the β-Sialon matrix phase and the corundum granules are again mixed in a weight ratio of 2:8 Mix the ingredients, add conventional organic molding binders, and press to form. Slowly raise the temperature in a flowing nitrogen atmosphere for nitriding reaction and sintering for a total of 80 hours, of which the maximum temperature is 1530°C for 16 hours at constant temperature. Cool to obtain a β-Sialon bonded corund...

Embodiment 2

[0015] Select the first-grade Suzhou kaolin and bentonite as clay raw materials at a ratio of 9:1 by weight, and adjust Si with silicon dioxide powder according to the chemical composition analysis results. 6-Z al Z o Z N 8-Z The ratio of silicon to aluminum reaches a Z value of 2. Industrial carbon black is added as a carbon source, the weight percentage of clay raw materials and carbon black is 1:0.28, and 1 wt% of vanadium oxide is added to form matrix raw materials after being mixed evenly. Then the mullite granules of 60#, 100# and 180# particle size are proportioned in a weight ratio of 6: 1.5: 2.5, wherein the raw material for forming the β-Sialon matrix phase and the mullite are again mixed in a weight ratio of 2.5: 7.5 Carry out mixing and batching, and add conventional organic molding binders, then press molding, and slowly raise the temperature in a flowing nitrogen atmosphere for carbothermal reduction-nitridation reaction sintering for a total of 72 hours, of w...

Embodiment 3

[0017] Select super-grade Suzhou kaolin and montmorillonite as clay raw materials at a ratio of 8:2 by weight, and adjust Si with silicon dioxide powder according to chemical composition analysis results. 6-Z al Z o Z N 8-ZThe ratio of silicon / aluminum in the middle reaches Z to be 2.5, and the carbon source is required as a raw material with graphite powder, and the weight percentage of clay raw material and graphite powder is 1: 0.27, then add 0.5wt% vanadium oxide and 0.5wt% zirconium oxide, and it After mixing evenly, the base material is formed. Then the corundum granules of 60#, 100# and 180# are compounded in a weight ratio of 6.5:1.5:2, wherein the raw material forming the β-Sialon matrix phase and the corundum are mixed and compounded again in a weight ratio of 2.2:7.8, After adding a conventional organic molding binder, it is pressed and molded, and the temperature is slowly raised in a flowing nitrogen atmosphere for carbothermal reduction-nitridation reaction si...

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PUM

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Abstract

The invention discloses an oxide ceramic composite phased fireproof material based on clay as raw material, which is characterized by the following: adopting clay minerals, industrial carbon powder and nitrogen as main raw material to form beta-sialon connecting phase; adding reacting accelerant, alumina or mullite particle to blend evenly; moulding; drying; aerating nitrogen in the high-temperature kiln to proceed carbon heat reducing-nitrogenizing reaction to sinter into combined beta-sialon alumina or mullite fireproof ceramic product with 10-30% beta-sialon continuous base phase and 70-90% alumina or mullite particle dispersing phase.

Description

Technical field: [0001] The invention belongs to the technical field of refractory ceramic materials, and relates to an oxide ceramic composite refractory material combined with a beta-sialon (β-sialon) matrix prepared by using clay raw materials through carbothermal reduction and nitriding reaction. technical background: [0002] Beta Sialon (β-Sialon) combined ceramic refractory material is a new type of non-carbon special refractory ceramic material that has been widely valued. Usually Si3N4 and alumina are used as the main raw materials to prepare β-Sialon because of its high cost of raw materials and high reaction and sintering temperature, which limits its development in the field of refractory materials. The technology of synthesizing β-Sialon by using the carbothermal reduction nitriding reaction method of natural mineral raw materials containing aluminum and silicon is from 1976. S.Wild (J.Mater.Sci.1976p 1972~1974) first synthesized β-Sialon by nitriding kaolin St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/185
Inventor 隋万美陈沙鸥栾世军
Owner QINGDAO UNIV
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