Preparation method of fiber enhanced thermal-shock-resisting foam ceramic

Abstract

The invention belongs to the technical field of preparation of foam ceramic materials and in particular relates to a preparation method of fiber enhanced thermal-shock-resisting foam ceramic. The preparation method comprises the following steps: mixing silicon carbide powder, corundum powder and kaolin powder, and putting a mixture into silica sol to obtain silicon carbide foam ceramic slurry; putting polyurethane sponge into paraffin wax silica sol formed by mixing silicon dioxide coated paraffin wax microcapsules and the silica sol to obtain a foam ceramic preformed body; finally, filling the foam ceramic preformed body into a mold and filling the silicon carbide foam ceramic slurry; firing to obtain the fiber enhanced thermal-shock-resisting foam ceramic. Paraffin wax in the silicon oxide coated paraffin wax microcapsules is hotly melted to obtain a liquid-state lubricant, and communication and overlapping of pore structures can be prevented, so that the effect of improving the closed pore rate is realized; paraffin wax, which is not decomposed, of an inner layer can absorb heat at high temperature and flows to dissipate heat, so that the thermal conductivity of the foam ceramicis reduced; silicon carbide is used as a framework in a matrix, so that the mechanical properties of the foam ceramic can be improved; the foam ceramic has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic material preparation, and in particular relates to a preparation method of fiber-reinforced thermal shock-resistant foam ceramics. Background technique [0002] Foam ceramics are the third generation of porous ceramics developed after porous ceramics and honeycomb ceramics. They are porous ceramic bodies with high porosity and three-dimensional space grid structure. Ceramic foam has excellent ceramic intrinsic properties such as high melting point, corrosion resistance and wear resistance, and due to the introduction of a large number of pores, it also has low thermal conductivity, controllable permeability, high specific surface area, low density, high specific strength, low properties such as dielectric constant. As a high-performance green environmental protection material, ceramic foam has been widely used in purification and separation, chemical catalyst carrier, advanced insulation mat...

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Problems solved by technology

[0012] The technical problem mainly solved by the present invention is to provide a fiber-reinforced anti-foaming ceramics for the defects that the mechanical strength is low due to the existence of the pore st

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