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ULTRACOARSE, MONORYSTALLINE TUNGSTEN CARBIDE AND METHOD FOR PRODUCING THE SAME, AND HARD METAL PRODUCED THEREFROM
ULTRACOARSE, MONORYSTALLINE TUNGSTEN CARBIDE AND METHOD FOR PRODUCING THE SAME, AND HARD METAL PRODUCED THEREFROM
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机译:超细,单晶钨硬质合金及其制造方法,以及由硬质合金生产的硬质合金
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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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