Porous material, cell structure, and method of producing porous material
AssigneeNGK Insulators, Ltd.
InventorsMika Tsuboi, Yunie Izumi, Takahiro Tomita
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Abstract
A porous material includes aggregate particles and a binding material. In the aggregate particles, oxide films containing cristobalite are provided on surfaces of particle bodies that are silicon carbide particles or silicon nitride particles. The binding material contains cordierite and binds the aggregate particles together in a state where pores are provided therein. The mass ratio of the cordierite to the whole of the porous material is in the range of 10 to 40 mass %. The oxide films that exist between the particle bodies and the binding material have a thickness less than or equal to 0.90 μm.
Claims9
A porous material comprising:
- aggregate particles in which oxide films containing cristobalite are provided on surfaces of particle bodies that are silicon carbide particles or silicon nitride particles;
- and
- a binding material that contains cordierite and binds said aggregate particles together in a state where pores are provided therein,
- wherein a mass ratio of said cordierite to a whole of said porous material is in a range of 10 to 40 mass %, and
- said oxide films that exist between said particle bodies and said binding material have a thickness less than or equal to 0.90 μm.
A method of producing a porous material, comprising:
- a) obtaining a compact by molding a mixture of an aggregate raw material, a raw material for binding material, and a pore-forming material;
- b) obtaining a fired compact by firing said compact in an inert atmosphere;
- and
- c) obtaining a porous material by subjecting said fired compact to an oxidation treatment in an oxidizing atmosphere,
- wherein said aggregate raw material contains silicon carbide particles or silicon nitride particles, and
- said raw material for binding material contains 35 to 45 mass % of talc, 45 to 60 mass % of aluminum oxide, and 0 to 10 mass % of silicon dioxide to a whole of said raw material for binding material.
Dependencies are inferred from the claim text.