Shimizu Shokuhin Kaisha, Ltd.

Apex Co. Ltd.

Shimizu Shokuhin Co., Ltd.

Yoshihisa Noro

Michio Nukaya

Junichi Adachi

Masakatsu Sekido

Yasufumi Ishii

Hironori Nakayama

A binder is used for molding starting powder materials such as metallic and ceramic powders. A high-viscosity agar which belongs to one type of natural poly-glycols, having a gel strength less than 3000 g/cm and a sol viscosity greater than 350000 mPa s (milliPascal seconds) is used as the binder.

Binder and molding process employing the same for use in molding metallic and ceramic powders

A sintered metal mould formed by plastically forming a material consisting of a metal powder or ceramic powder being mixed with a binder consisting of agar powder, and sintering the material.

Sintered metal mould and method for producing the same

Provided is an injection-molding method for forming into given finished parts by injection-molding raw materials of a metal or ceramic powder feed, in which steps of coating a release agent to the mold, degreasing and freeze solidification are dispensed with. In this method, a metal or ceramic powder feed is kneaded with an agar sol comprising water, which may have or have not been treated magnetically, agar powders having a gel strength of 2000 g/cm.sup.2 at an least 2% concentration and sodium borate to form a clay form of sol-state plastic material, and this material is then put in a heat-retaining hopper of injection-molding equipment in which it is injection-molded. Alternatively, this clay form of plastic material is cooled for gelation and pelletization (to obtain finely granulated gels). The pellets are put in a hopper of injection-molding equipment in which it is formed while heated and melted. The elasticity and viscosity of an agar solution is much more improved by adding sodium borate to a sol-state agar solution.

Injection-molding of metal or ceramic powders

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Kanagawa-ken, Japan

Yoshihisa Noro