Silicon carbide-based porous body
AssigneeNGK Insulators, Ltd.
InventorsMasaaki KAWAI, Yoshio KIKUCHI
Life of this patent
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Abstract
A silicon carbide-based porous body comprising a plurality of silicon carbide (SiC) particles as an aggregate and a binder which binds the silicon carbide particles to each other, wherein the content of the binder, i.e. [100×binder/(silicon carbide particles+binder)] is 5 to 70% by volume, the open pore ratio is 30 to 70%, and the binder contains at least one member selected from the group consisting of a Ti silicide, a Zr silicide, a Mo silicide and a W silicide, in an amount of at least 60% by volume of the total binder. The silicon carbide-based porous body can avoid excessive temperature elevation when it is used as a filter and the particulate matter (PM) captured thereby is burnt and removed.
Claims16
A silicon carbide-based porous body comprising a plurality of silicon carbide (SiC) particles as an aggregate and a binder which binds the silicon carbide particles to each other, wherein
- the content of the binder, i.e. [100×binder/(silicon carbide particles+binder)] is 5 to 70% by volume,
- the open pore ratio is 30 to 70%, and
- the binder contains at least one member selected from the group consisting of a Ti silicide, a Zr silicide, a Mo silicide and a W silicide, in an amount of at least 60% by volume of the total binder.
A method for producing a silicon carbide-based porous body, which comprises
- kneading a raw material to be formed, to prepare a puddle, wherein the raw material to be formed comprises silicon carbide particles, a binder raw material and a pore former, the binder raw material containing at least 60% by volume of a metal silicide raw material, the metal silicide raw material being (a) a mixture of a silicon powder and at least one member selected from the group consisting of Ti, Zr, Mo and W, (b) at least one member selected from the group consisting of a Ti silicide, a Zr silicide, a Mo silicide and a W silicide, or (c) a mixture of (a), (b) and (c), the content of the binder raw material, i.e. [100×binder raw material/(silicon carbide particles+binder raw material)] being 5 to 70% by volume, and the content of the pore former, i.e. (100×pore former/raw material to be formed) being 25 to 85% by volume,
- forming the puddle to prepare a formed material, and
- firing the formed material to obtain a silicon carbide-based porous body.
Dependencies are inferred from the claim text.