Preparation of high-temperature floamed ceramic

Abstract

The invention provides a preparation method of a high temperature foam ceramics, which is characterized in that: zirconium diboride-aluminum oxide composite ceramic powder is prepared into ceramic slurry, polyurethane foaming plastic with certain bore diameter and porosity is soaked into the ceramic slurry so that the ceramic slurry evenly adheres to the surface of the pores of the polyurethane foaming plastic to form a ceramic slurry layer, which are then prepared into a polyurethane foaming plastic ceramic blank, and then are subjected to drying, degreasing and sintering, and the high temperature foam ceramics is prepared. The invention adjusts the high temperature resisting performance of the high temperature foam ceramics prepared by adjusting the ratio of zirconium diboride and aluminum oxide, therefore, the high temperature foam ceramics can resist high temperature and greatly expand working temperature scope; the high temperature foam ceramics prepared by the method can resist high temperature and keep chemical stability under high temperature condition; therefore, in high temperature working environment, the high temperature foam ceramics can be used repeatedly or continuously for the performances of thermal-shock resistance, oxidation resistance, molten steel erosion resistance, and the like, when being used in the filtration of molten steel, showing good performance.

Description

Technical field [0001] The invention relates to a method for preparing high-temperature foam ceramics, which belongs to the technical field of preparation of special ceramics. Background technique [0002] Foam ceramics are mainly used in the filtration of metal melts in the metallurgical industry. As a melt filter material, it must have good high temperature performance and mechanical properties, and also have good chemical stability under high temperature conditions. At present, in the metallurgical industry, such as cast iron, cast steel, copper alloy, aluminum alloy, etc., materials such as alumina, cordierite, silicon carbide, and fused zirconium corundum are commonly used to prepare ceramic slurry with inorganic or organic binders. The ceramic slurry is impregnated on the surface of polyurethane foam plastics, dried, and fired to make ceramic foams. For example, the preparation technology of ceramic foams disclosed in the Chinese Patent Gazette with application number...

AI Technical Summary

Problems solved by technology

At present, in the metallurgical industry, such as cast iron, cast steel, copper alloy, aluminum alloy, etc., materials such as alumina, cordierite, silicon carbide, and fused zirconium corundum are commonly used to prepare ceramic slurry with inorganic or organic binders. The ceramic slurry is impregnated on the surface of polyurethane foam plastics, dried, and fired to make ceramic foams. For example, the preparation technology of ceramic foams disclosed in the Chinese Patent Gazette with application numbers 87101800.4, 85102359A, 92102883.0, and 1410393A all adopt aluminum oxide, The preparation of materials such as sapphire, silicon carbide, and fused zirconia corundum cannot be used in working environments above 1700°C, and can only be used at temperatures below 1700°C, and its performance needs to be further improved.