Mixing the porous ceramics and its production mannered null pre- ceramic polymer powder and expansion possible hollow die minute sphere

摘要

PROBLEM TO BE SOLVED: To provide a simple production method of porous ceramics characterized by steps of producing a porous ceramics that has a uniform distribution of pore under one atmospheric pressure without using pressure and using only a thermal decomposition step of a preceramic polymer at a relatively low temperature of 1,500°C or lower without the sintering step to produce porous ceramics with high porosity of 60% or more and high pore density of 109 pores/cm³ or more.;SOLUTION: The method comprises a step of uniformly mixing the preceramic polymer powder, a swellable hollow microsphere and a ceramic powder or uniformly mixing the preceramic polymer powder and the swellable hollow microsphere and then molding the mixture to produce a molding; a step of heating and swelling the molding; a step of curing the swelled molding; and a step of heating and thermally decomposing the cured molding, thereby producing the porous ceramics with a high porosity. The obtained porous ceramics by this method has a higher porosity and a higher pore density in comparison with the normal porous ceramics material and is applicable to fields in various high temperature structural materials, high temperature furnace materials, bulletproof materials, shock absorption materials, insulating materials, refractories, light weight structural materials and the like.;COPYRIGHT: (C)2005,JPO&NCIPI