发明名称 |
Ultra-coarse, monocrystalline tungsten carbide and a process for the preparation thereof, and hardmetal produced therefrom |
摘要 |
A process is described for the preparation of tungsten and/or molybdenum metal powder or carbide by reducing and optionally carburizing treatment of tungsten and/or molybdenum oxide powder in the presence of alkali metal compounds, wherein at least two alkali metal compounds are used in a ratio so that mixed alkali tungstate or molybdate potentially formed in an intermediate step ((Li, Na, K)2 WOZ, (Li, Na, K)2MoOZ) has a melting point of less than 550° C., wherein z is from 3 to 4.
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申请公布号 |
US2002078794(A1) |
申请公布日期 |
2002.06.27 |
申请号 |
US20010944038 |
申请日期 |
2001.08.30 |
申请人 |
BREDTHAUER JORG;GRIES BENNO;SZESNY BERNHARD |
发明人 |
BREDTHAUER JORG;GRIES BENNO;SZESNY BERNHARD |
分类号 |
B22F1/00;B22F9/20;B22F9/22;C01B31/34;C22B5/04;C22B34/34;C22B34/36;C30B29/36;(IPC1-7):B22F9/22 |
主分类号 |
B22F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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