Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2007-05-15
2007-05-15
Turner, Archene (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C051S307000, C051S309000, C428S698000, C428S699000
Reexamination Certificate
active
10393183
ABSTRACT:
The invention concerns a wear-resistant coating on rotary metal-cutting tools such as drill bits, countersinks, milling cutters, screw taps, reamers, etc. The coating according to the invention consists essentially of nitrides of Cr, Ti and Al with a unusually high share of Cr atoms, namely 30 to 60% referred to the totality of metal atoms. In multilayer coatings and even more in coatings made of homogeneous mixed phases, this high Cr share results in particularly large tool life distances for the tools hardened with these coatings. These tools exhibit their superiority particularly during dry use without cooling lubricants or with minimal lubrication.
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Moll Eberhard
Weber Frank-R
Boyle Fredrickson Newholm Stein & Gratz S.C.
Guehring Joerg
Turner Archene
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