POROUS SILICON NITRIDE ARTICLE AND METHOD FOR PRODUCTION THEREOF

摘要

A porous silicon nitride article (5) which is prepared by nitriding a formed article containing metallic silicon (3) as a primary component, characterized in that the silicon nitride article has a porous structure having an average pore diameter of 3 ñm or more, has a total content of silicon and nitrogen of 95 % or more and has a degree of nitrization of silicon of 90 % or more. The porous silicon nitride article has a porous structure having a large average pore diameter and a specimen from the article exhibits a high thermal conductivity and a low thermal expansion coefficient, and thus the article can be suitably used for parts of a gas and/or solution clarification device such as a ceramic filter.