| 摘要 |
PURPOSE:To obtain a silicon nitride structural body having largely improved heat insulating property while maintaining high temp. strength of the whole structural body by constituting both of a dense structural body and a porous structural body of silicon nitride, and making these members into one body. CONSTITUTION:The dense structural body is obtd. by sintering powder or a granular material of silicon nitride in a frame of specified shape at high temp. The porous structural body having 10-70% relative density is obtd. by entangling fibrous silicon nitride (e.g. alpha-silicon nitride whisker) having 0.05-10mum fiber diameter and 0.01-10mm length so as to obtain 90-30% porosity, compounding and mixing a binder (e.g. aluminum oxide) by <=30wt.% to the fibrous silicon nitride, filtering by sucking according to the specified shape, and then sintering. To make the dense structural body and the porous structural body in one body, a cup-like base 1 is formed by using the dense structural body, the porous structural body 2 is fitted to the inside of the base and covered with a plate 3 comprising the dense structural body, and then the base 1 and plate 3 are joined with an adhesive 4. |
