Sumitomo Electric Industries, Limited

Yasuhiro Shimizu

Akira Doi

Naoji Fujimori

Toshio Nomura

Nobuyuki Kitagawa

Masaaki Tobioka

Kazutaka Isobe

Kunihiro Takahashi

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

A substrate is treated for forming a thin film on the surface of the substrate to obtain a hard layer adhering to the substrate surface. For this purpose the substrate is placed in a metal vapor atmosphere and simultaneously bombarded by metal or nonmetal ions which are implanted into the substrate while the metal vapor atmosphere is also being ionized.

Surface treatment process

Coated hard alloys excellent in toughness and wear resistance comprise a substrate of hard alloy and at least one coating layer thereon, at least one of the coating layers being of amorphous alumina.

Coated hard alloys

Growing community of inventors

Itami, Japan

Yasuhiro Shimizu