Sumitomo Electric Industries, Limited

Kunihiro Takahashi

Toshio Nomura

Nobuyuki Kitagawa

Masaaki Tobioka

Takaharu Yamamoto

Kazutaka Isobe

Akira Doi

Yasuhiro Shimizu

Shinya Tsukamoto

The invention relates to sintered hard metals having high cutting properties, particularly plastic deformation resistance at high temperatures, crater resistance and the like, suitable for use as cutting tools, wear resistant tools and materials for dies, and the method for producing the same. The invention has for an object to obtain both sintered hard metals having the aforesaid high properties by sintering metallic components comprising IVa group metals, VIa group metals or metals of both groups substituted by Va group metals up to 60 mol % respectively, a B-1 type solid solution hard phase consisting of non-metallic components of C, N and O, and a metallic bonding phase, in a CO gas atmosphere, and to sintered hard metals in which an uniform hardness is imparted to the surface and interior thereof by the method of sintering the said sintered hard metal in a CO gas atmosphere.

Sintered hard metals and the method for producing the same

High hardness and high toughness nitrogen-containing sintered hard alloys or cermets useful for cutting tools, in particular, high speed cutting are provided which comprises a hard dispersed phase consisting essentially of a mixed carbonitride of titanium and at least one element selected from the group consisting of Group IVa, Va, and VIa elements of Periodic Table, except titanium, and a binder metal phase consisting essentially of at least one metal selected from the group consisting of nickel and cobalt, and unavoidable impurities, the hard dispersed phase having previously been subjected to a solid solution forming treatment at a temperature of at least the sintering temperature before sintering.

High toughness cermet and a process for the production of the same

This invention provides a process for producing a high quality powdered alloy such as cemented carbides, cermets, ceramics and iron-containing sintered alloys by sintering, characterized in that the sintering is carried out in a plasma gas atmosphere of H.sub.2, N.sub.2, CO, He and/or Ar.

Sintering method using a plasma gas atmosphere

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Itami, Japan

Kunihiro Takahashi