A tool for machining is made from a hard-metal, cermet or ceramic base material and a single-layer or multi-layer hard material coating on the base material. An additional coating of one or more metals from the group of aluminum, copper, zinc, titanium, nickel, tin or base alloys of these metals is applied...http://www.google.de/patents/US8021757?utm_source=gb-gplus-sharePatent US8021757 - Tool for machining
