SiC nano-wire reinforced porous ceramic composite material and preparation method thereof

Abstract

The invention discloses a SiC nano-wire reinforced porous ceramic composite material and a preparation method thereof. The material has a bulk density of 0.5-1.8 g / cm<3> and a through-hole ratio of 50-80%, and is composed of porous ceramic, SiC nano-wires, an interface layer and a SiC matrix, the SiC nano-wires in situ grow in the porous ceramic, the surfaces of the SiC nano-wires and the porous ceramic are coated with the interface layer, and gaps of the porous ceramic and the SiC nano-wires are filled with the SiC matrix. The SiC nano-wires are used to reinforce a porous ceramic composite material, so the internal specific surface area of the porous ceramic is effectively improved, and the porous ceramic is structurally toughened and reinforced; and in-situ filling with the SiC matrix significantly improves the filtration performance and the high-temperature heat insulation performance of the porous ceramic composite material.

Description

technical field [0001] The invention relates to a porous ceramic composite material and a preparation method thereof, in particular to a SiC nanowire reinforced porous ceramic composite material and a preparation method thereof. Background technique [0002] The porous ceramic structure presents a three-dimensional network structure, which has low density, high porosity, large specific surface area, good thermal shock resistance, chemical corrosion resistance, low thermal expansion coefficient, good dimensional stability and good filtration adsorption. It is used in gas and liquid filtration, purification and separation, chemical catalysis, sound absorption and shock absorption, high temperature insulation materials and other fields. However, due to the high brittleness of porous ceramics, and the size of the pores of porous ceramics is generally between tens to hundreds of microns, when it is used in the fields of filter materials and sound-absorbing and heat-insulating mat...

AI Technical Summary

Problems solved by technology

[0008] At present, porous ceramic materials are mainly made of ceramic powder, which are formed by injection, dry pressing, sintering and other processes to obtain porous ceramic materials. The porous ceramics obtained by these methods have the advantages of high porosity, controllable pore size, and high production efficiency. However, due to the high brittleness of ceramic materials and low damage tolerance, when porous ceramics are used in high-temperature filter materials, high-temperature insulation materials and other fields, the service life is low and the performance reliability is poor. Ten to hundreds of microns, resulting in insufficient effective filtration performance, etc.