| 摘要 |
PURPOSE: To produce a nitrogen-contg. sintered hard alloy excellent in impact resistance and wear resistance and showing extremely excellent performance even in the case of being applied to cutting tools in particular. CONSTITUTION: On the surface part of the alloy, an exudation layer (A) composed of a metal bonding phase essentially consisting of Ni (C) and Co (B) and WC is present, and this exudation layer is divided into three layers in the inside direction. The outermost surface layer is composed of 0 to 30vol.% WC, and the balance metal bonding phase formed of Co and Ni as the main components. The intermediate layer is composed of 50 to 100vol.% WC, and the balance metal bonding phase formed of Co and Ni as the main components. The lowermost layer is composed of 0 to 30vol.% WC, and the balance Co and Ni as the main components. The thicknesses of the outermost layer and the lowermost layer are both regulated to 0.1 to 10μm, and the thickness of the intermediate layer is regulated to 0.5 to 10μm, by which the nitrogen-contg. sintered hard alloy can be obtd.
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