Oxide ceramics multiple phase refractory material

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...