The present invention relates to a method of making a cemented carbide using submicron WC grain size (manufactured by carbothermal process) and containing WC and 6-24 wt.% Co using a cobalt powder having deagglomerated spherical grains of submicron average grain size and with a narrow grain size distribution wherein at least 80 % of the grains have sizes in the interval x+0.2x provided that the interval of variation (that is 0.4x) is not smaller than 0,1 νm. The invention is characterised in adding 1 wt.% grain growth inhibitor such as VC and/or CR3C2 and selecting a carbon content close to etaphase formation.
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机译：本发明涉及一种使用亚微米级WC粒度（通过碳热法制得）并含有WC和6-24重量％Co的钴粉末的硬质合金的制备方法，所述钴粉末具有具有亚微米级平均粒度的团聚球形颗粒并且具有狭窄的晶粒尺寸分布，其中至少80％的晶粒的尺寸在x + 0.2x范围内，条件是变化的间距（即0.4x）不小于0.1νm。本发明的特征在于添加＜1重量％的晶粒生长抑制剂，例如VC和/或CR 3 C 2，并选择接近于等位相形成的碳含量。
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