Injex Corporation

Shoji Takahashi

Kenichi Shimodaira

Syozo Shimizu

Masaaki Sakata

A highly reliable sintered compact which can be readily and safely produced, and a method for producing such sintered compact are provided. The sintered compact is preferably formed into a heat sink which comprises a heat sink main body The heat sink main body comprises a substrate a plurality of projections integrally formed with the substrate on its heat dissipation surface, and a molded frame integrally formed with the substrate to surround the projections On each corner of the substrate is formed a circular molded hole The opposite surface of the substrate is formed into a contacting surface which is adapted to be in contact with the heat generating semiconductor chip, and this contacting surface is surface treated, for example, by plating. The sintered compact is produced from metal powders, and it comprises at least one metal selected from tungsten and molybdenum and 2 to 50% by weight of silver. The sintered compact further comprises not more than 10% by weight of a transition metal.

Sintered compact and method of producing the same

In a method of manufacturing a sintered compact, a green body formed of titanium or titanium alloy powder is sintered in a furnace to produce a sintered compact. In this case, the green body is sintered under the condition that it is placed on a setter within a container formed of carbon materials. The setter is constructed from a base member and a plate-like green body contact portion joint onto the base material. The green body contact portion is formed of oxides of metals whose standard free energy of oxide formation is higher than that of the titanium or titanium alloy of the green body. The setter which has been already used is reused after the surfaces of the green body contact portion is ground or polished, so that a new green body is placed on the setter and then it is sintered again. In this way, increase of oxide in the obtained titanium and titanium alloy powder during sintering is restrained, thereby enabling to produce a high-quality sintered compact having a high dimensional accuracy easily with a low cost.

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Nagano-ken, Japan

Shoji Takahashi