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1. 发明公开

EP1281670A1 Fine tungsten carbide powder and process for producing the same 有权
标题翻译： Feines Wolframcarbidpulver und Verfahren zu dessen Herstellung
公开(公告)号：EP1281670A1
公开(公告)日：2003-02-05
申请号：EP02002078.0
申请日：2002-02-11
申请人： MITSUBISHI MATERIALS CORPORATION , Japan New Metals Co., Ltd.
发明人： Yaginuma, Hiroshi , Morita, Susumu
IPC分类号： C01B31/34
CPC分类号： C01B32/949 , C01P2002/77 , C01P2004/62 , C01P2006/12 , C01P2006/80
摘要： A process is provided for producing a fine tungsten carbide powder, which comprises the steps of drying a slurry, which is obtained by mixing an aqueous ammonium tungstate solution with a carbon powder, at low temperature, to form a precursor, mixing a reduced and carburized product, which is obtained by reducing and oxidizing the precursor in a non-oxidizing gas, with a carbon powder in a proportion required to substantially carburize the entire tungsten component into tungsten carbide (WC), and carburizing the mixture; and a high-performance fine tungsten carbide powder produced by the process, which has an average particle size of 0.8 µm or less and is free of a coarse power having a particle size of more than 1 µm, and which also contains less metal impurities and contains oxygen and nitrogen in a predetermined amount.
摘要翻译：提供了一种生产精细碳化钨粉末的方法，其包括以下步骤：在低温下将钨酸铵水溶液与碳粉末混合而获得的浆料干燥以形成前体，混合还原和渗碳产品，其通过以非氧化性气体中的前体还原和氧化得到的碳粉末以使整个钨组分基本上渗碳到碳化钨（WC）中所需的比例并将该混合物渗碳得到; 以及平均粒径为0.8μm以下并且不具有粒径大于1μm的粗大功率，并且还含有较少金属的该方法生产的高性能微细碳化钨粉末杂质并含有预定量的氧和氮。

2. 发明授权

EP1281670B1 Fine tungsten carbide powder and process for producing the same 有权
标题翻译：细碳化钨粉和工艺及其制备方法
公开(公告)号：EP1281670B1
公开(公告)日：2007-11-14
申请号：EP02002078.0
申请日：2002-02-11
申请人： MITSUBISHI MATERIALS CORPORATION , Japan New Metals Co., Ltd.
发明人： Yaginuma, Hiroshi , Morita, Susumu
IPC分类号： C01B31/34
CPC分类号： C01B32/949 , C01P2002/77 , C01P2004/62 , C01P2006/12 , C01P2006/80
摘要： A process is provided for producing a fine tungsten carbide powder, which comprises the steps of drying a slurry, which is obtained by mixing an aqueous ammonium tungstate solution with a carbon powder, at low temperature, to form a precursor, mixing a reduced and carburized product, which is obtained by reducing and oxidizing the precursor in a non-oxidizing gas, with a carbon powder in a proportion required to substantially carburize the entire tungsten component into tungsten carbide (WC), and carburizing the mixture; and a high-performance fine tungsten carbide powder produced by the process, which has an average particle size of 0.8 mu m or less and is free of a coarse power having a particle size of more than 1 mu m, and which also contains less metal impurities and contains oxygen and nitrogen in a predetermined amount.

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