H.c. Starck Gmbh

Hermann C. Starck Berlin Gmbh & Co Kg

Bernhard Szesny

Benno Gries

Bruno E Krismer

J&ouml;rg Bredthauer

Heinz-Eckert Schutz

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) WO , (Li, Na, K) MoO ) has a melting point of less than 550&deg; C., wherein z is from 3 to 4.

Ultra-coarse, monocrystalline tungsten carbide and a process for the preparation thereof, and hardmetal produced therefrom

Metal powder agglomerates of individual particles comprising (i) more than 70% by weight of one or more metals selected from the group consisting of the elements molybdenum, rhenium and tungsten and (ii) one or more binder metals selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, palladium, platinum, rhodium, chromium and rhenium, wherein the individual particles have grain sizes of less than 2 .mu.m and all the metal particles lie side by side in uniform random distribution are useful as the powder required for producing shaped, sintered articles in a powder metallurgical preparation.

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Langelsheim, Germany

Bernhard Szesny