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Coated cemented carbides and processes for the production of same
| Details |
Inventors: Nakano, Minoru; Nomura, Toshio;
Assignee: Sumitomo Electric Industries, Ltd. (Osaka, JP)
Primary Examiner: Walsh; Donald P.
Assistant Examiner: Jenkins; Daniel
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
A coated cemented carbide alloy, excellent in toughness as well as wear resistance and which is used for cutting tools and wear resistance tools is provided herein. This coated cemented carbide alloy is composed of a cemented carbide substrate consisting of a hard phase of at least one member selected from carbides, nitrides and carbonitrides of Group IVb, Vb and VIb metals of the Periodic Table and a binder phase consisting of at least one member selected from the iron group metals, and a monolayer or multilayer, provided on the substrate consisting of at least one member selected from carbides, nitrides, oxides and borides of Group IVb, Vb and VIb metals of Periodic Table, solid solutions thereof and aluminum oxide, and wherein a binder phase-enriched layer is provided in a space 0.01 mm and 2 mm below the surface of the substrate with A-type and/or B-type pores inside the binder phase-enriched layer. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a surface-coated cemented carbide suitable for use as cutting tools and wear resisting tools, whereby the disadvantages of the prior art can be overcome.
It is another object of the present invention to provide a tool capable of maintaining an excellent wear resistance and toughness under conditions of high efficiency, that the prior art cannot attain.
These objects can be attained by a surface-coated cemented carbide comprising a cemented carbide substrate consisting of a hard phase of at least one member selected from the group consisting of carbides, nitrides and carbonitrides of Group IVb, Vb and VIb metals of the Periodic Table and a binder phase consisting of at least one member selected from the iron group metals, and a monolayer or multilayer, provided thereon, consisting of at least one member selected from the group consisting of carbides, nitrides, oxides and borides of Group IVb, Vb and VIb metals of the Periodic Table, solid solutions thereof and aluminum oxide, in which a binder phase-enriched layer is provided in a space between 0.
01 mm and 2 mm below the surface of the substrate.
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