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    • 28. 发明授权
    • Cemented carbide, coated cemented carbide member and production processes of the same
    • 硬质合金,涂层硬质合金材料及其生产工艺相同
    • US07097685B2
    • 2006-08-29
    • US10924872
    • 2004-08-25
    • Hiroyuki MiuraSatoshi Kinoshita
    • Hiroyuki MiuraSatoshi Kinoshita
    • B22F3/00B22F7/02C22C29/02
    • B22F7/008B22F2999/00C22C1/051C22C29/08Y10T428/12021Y10T428/12028B22F2207/01B22F3/1007B22F2201/02
    • A cemented carbide comprises a binder phase consisting essentially of an iron family metal, a first hard phase consisting essentially of WC having a hexagonal crystal structure, and a second hard phase consisting essentially of one or more types of a compound of a metal or metals of group 4, 5 or 6 of the periodic table having an NaCl-type cubic crystal structure. The cemented carbide is formed by a surface region with a thickness of 2 to 50 μm consisting of the binder phase and the first hard phase, and an inner region present underneath the surface region consisting of the binder phase, the first hard phase and the second hard phase. A ratio of an average grain size of the first hard phase in the surface region to an average grain size of the first hard phase in the inner region is 1 or less, and a ratio of an area of the binder phase in the surface region to an area of the binder phase in the inner region is greater than 1.
    • 硬质合金包括基本上由铁族金属组成的粘结相,基本上由具有六方晶体结构的WC组成的第一硬质相和基本上由一种或多种金属或金属的化合物组成的第二硬质相 具有NaCl型立方晶体结构的周期表第4,5或6族。 硬质合金由厚度为2〜50μm的由粘结相和第一硬质相组成的表面区域形成,以及存在于由粘结相,第一硬质相和第二硬质合金相组成的表面区域下方的内部区域 硬相。 表面区域中的第一硬质相的平均粒径与第一硬质相在内部区域的平均粒径的比例为1以下,表面区域中的粘结相的面积与 内部区域的粘合剂相的面积大于1。