Denso Corporation

Nippon Soken, Inc.

Yasuki Aoi

Hirofumi Suzuki

Itsuhei Ogata

Hiroshi Araki

Mayumi Ozeki

A plastic molding composition includes a powder, gelatin, a polar solvent, and an adhesion reducer. The powder contains at least one of a ceramic particle and a metal particle. The adhesion reducer reduces adhesion of the gelatin so that a molded product, which is molded from the composition with a molding die, is removed from the molding die without being broken. The adhesion reducer is a water-soluble or water-dispersible compound. The adhesion reducer has a HLB value, calculated by Griffin's method, ranging from 10 to 20.

Plastic molding composition and sintered product

An alumina sintered body comprises alumina crystals as a main phase and a grain boundary phase made up of crystalline YSiOand amorphous SiOat grain boundaries of the alumina crystals wherein when the alumina sintered body is taken as 100 wt %, the high melting phase is present in the range of from 0.1 wt % to 15 wt %. There is also provided a method for preparing the alumina sintered body, which method comprising a first mixing step Pof mixing, at least, a yttria powder having an average particle size of 60 to 100 nm and a silica powder having a given average particle size to provide a mixed slurry and a second mixing step of further mixing an alumina powder having an average particle size of 0.5 to 1.0 &#x3bc;m in the mixed slurry.

Growing community of inventors

Gifu, Japan

Yasuki Aoi