Hilti Aktiengesellschaft

Elektroschmelzwerk Kempten Gmbh

Wolf-Dieter Schubert

Steven Moseley

Theodor Benecke

Herbert Danninger

Arno Glaser

Christian Gierl-Mayer

Ralph Useldinger

Gerhard Kahr

An Tuan Ta

Benno Lux

Robert Hellein

Siavash Momeni

Andrea Müller-Grunz

Christian Gierl-mayer

A tool for machining materials has a main part and one or more blades. The main part is made of a low-alloy steel. The socket is welded to the main part, and the blade edges are made of a hard metal. The hard metal contains at least 82 vol. % of tungsten carbide and a metallic binder made of a cobalt-nickel-based alloy. The hardness of the hard metal is greater than 1350 HV10. The socket has a sintered composite, and 40 vol. % to 60 vol. % of the composite is composed of a metal carbide and a metallic binder. At least 95 vol. % of the metallic binder is made of nickel, and the hardness of the composite is less than 800 HV10.

Tool

The invention relates to a process for treating cast iron melts with silicon carbide. In this process, the silicon carbide used is subjected, before being introduced into the cast iron melt, to an oxidizing treatment in such a manner that the individual SiC granules are coated with a covering containing silica. A silicon carbide of this quality can be manufactured, for example, by subjecting the SiC in granular form, in a static or agitated mass, to an oxidizing atmosphere, such as air, oxygen or water vapor, at temperatures within the range of 900.degree.-1600.degree. C. and subsequently subjecting the agglomerates formed to gentle comminution to expose the SiC surfaces which, as a result of the formation of an agglomerate, completely or partially escaped the oxidizing attack.

Process for treating cast iron melts with silicon carbide

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Vienna, Austria

Wolf-Dieter Schubert