PVD TiN (Physical Vapor Deposition Titanium Nitride) coatings are the primary general-purpose coating for end mills, but TiCN (Titanium Carbo-Nitride) and TiAlN (Titanium Aluminium Nitride) are becoming popular in use. Common questions for milling applications include when to use these advanced coatings, and at what speeds to run them.
TiCN is a harder coating than TiN and has good abrasion resistance. It is very good in milling applications for steels, stainless steels, and non-ferrous materials. End mills coated with TiCN should be operated at speeds up to 50% higher than uncoated end mills.