| 摘要 |
A method for producing a silicon nitride filter, which comprises heat-treating in nitrogen a green body comprising from 35 to 90 mass % of silicon nitride particles having an average particle diameter of from 1 to 30 mum, from 5 to 60 mass % of a pore-forming agent and from 0.1 to 5 mass % of metal oxide particles, provided that the total amount of the silicon nitride particles, the pore-forming agent and the metal oxide particles is at least 90 mass %, to form a porous product made substantially of silicon nitride
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