Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1986-06-30
1988-06-07
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Composite
Of inorganic material
428699, B32B 1706
Patent
active
047496304
ABSTRACT:
A coated hardmetal body comprised of a hardmetal core which contains cobalt as well as tungsten carbide and of an oxygen containing hard substance layer free of binder metal is disclosed whose hardmetal basic body has a zone at its surface which is 0.2 to 20 microns thick and which contains the CoWB phase in addition to the hardmetal components. It is of particular advantage for the binder metal free, oxygen containing hard substance layer to be composed of aluminum oxide, zirconium oxide or aluminum oxynitride. It is further provided that at least one further binder metal free hard substance layer of carbides, nitrides, borides and/or oxides is applied to the binder metal free hard oxide layer. The coated hardmetal body may advantageously be used as a cutting bit for machining metallic workpieces. The coated hardmetal body is produced by gas phase boration and subsequent hard substance coating according to the CVD process.
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Konig Udo
Reiter Norbert
van den Berg Hendrikus
Fried. Krupp Gesellschaft mit beschrankter Haftung
Swisher Nancy A. B.
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