Method for producing silicon nitride filter

摘要

A method for producing a silicon nitride filter, which comprises subjecting a molded product comprising from 35 to 58 mass% of metal silicon particles, from 30 to 62.5 mass% of organic polymer particles, from 0.3 to 10 mass% based on the content of the organic polymer particles of the following inorganic particles A and from 1 to 15 mass% based on the content of the metal silicon particles of the following inorganic particles B, to a heat treatment in nitrogen to substantially convert metal silicon into silicon nitride:
inorganic particles A: inorganic particles of at least one member selected from the group consisting of an oxide, a hydroxide and a salt of an element selected from the group consisting of Si, Ti and Ce;
inorganic particles B: inorganic particles of at least one member selected from the group consisting of an oxide, a hydroxide and a salt of an element selected from the group consisting of Mg, Y, La, Nd, Yb, Ca and Fe.