H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

J&ouml;rg Bredthauer

Benno Gries

Bernhard Szesny

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

The invention relates to a method for producing a homogeneous mixture of hard material powders and binder metal powders without using grinding bodies, liquid grinding auxiliary agents and suspending media. According to the invention, the mixture components are mixed at close range while generating a high shearing collision velocity of the powder particles and are remotely mixed by rotating the mixing bed without resulting in a particle size reduction of the hard material powders.

Growing community of inventors

Bonn, Germany

Jörg Bredthauer

Growing community of inventors

Bonn, Germany

J&ouml;rg Bredthauer

Jörg Bredthauer