Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Reexamination Certificate
2006-05-09
2006-05-09
Xu, Ling (Department: 1775)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
C428S307300, C428S209000, C428S312200, C428S313300, C428S313900, C428S314400, C428S446000, C428S698000, C428S697000, C428S702000, C428S704000, C264S665000, C264S683000, C264S489000, C264S474000, C264S417000, C501S039000, C501S053000, C501S064000, C501S080000, C501S097100, C501S097200, C501S152000, C501S154000
Reexamination Certificate
active
07041366
ABSTRACT:
The invention provides porous silicon nitride ceramics that having uniform, fine closed pores and a manufacturing method thereof. Metal Si powder is mixed with a sintering additive, followed by thermal treatment, which is a pre-process for forming a specific grain boundary phase. Two-stage thermal treatment is thereafter performed by microwave heating at a temperature of 1000° C. or more. The metal Si powder is thereafter subjected to a nitriding reaction from its surface, the metal Si is thereafter diffused to nitride formed on the outer shell thereof such that porous silicon nitride ceramics having uniform, fine closed pores can be produced. Having a high ratio of closed pores and being superior in electrical/mechanical characteristics, the porous silicon nitride ceramics can display excellent characteristics if used, for example, for an electronic circuit board that requires an anti-hygroscopicity, a low dielectric constant, a low dielectric loss, and mechanical strength.
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Translation of JP-08-228105.
Translation of JP-63-20915008.
Translation of JP-63209150.
Komura Osamu
Miyanaga Michimasa
McDermott Will & Emery LLP
Sumitomo Electric Industries Ltd.
Xu Ling
LandOfFree
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