It refracts heat and acts as a thermal barrier between the chip and the tool. TiN has a very low coefficient of friction to reduce chip welding and tools can be operated at high speeds and feeds. Performance will vary by material and cutting tool. The harder the base material of the tool, the more effective TiN coating will be. Used for ferrous metals below Rc40 hardness and for non-ferrous metals where increased metal removal rates signify productivity.
TiN coated tools have a tendency to gall in Titanium and Titanium alloys.
ZrN has more lubricity, improved chemical resistance, and better thermal stability at higher temperatures. Performance will vary by material and tool. Used for aluminum alloys, cast iron, high temperature alloys, stainless steels, and non-ferrous metals. Also very effective in glass filled plastics and wood. Inc. All rights reserved.