voestalpine eifeler Coatings has developed a series of Physical Vapor Deposition (PVD) coatings for the cutting tool industry. The main coating materials are Titanium Nitride (TiN), Titanium Carbo-Nitride (TiCN), and a family of Aluminum Titanium Nitride and Titanium Aluminum Nitride coatings (AlTiN/TiALN).
TiN is one of the oldest coatings and is considered a generic coating, good to a degree for many applications. TiN provides a lower friction coefficient and superior cratering resistance versus an uncoated tool, it will also increase tool life on most any nonexotic work piece materials. TiN has a gold color, differentiating the coating from the substrate.
Titanium Carbo-Nitride (TiCN) is a very hard coating with a low friction coefficient which performs well on stainless steel, alloyed aluminum such as 6061 and standard materials such as 4140, 1018 etc. outperforming TiN in most cases. TiCN does not perform well when extreme heat is created at the point of cut. In alloyed aluminum TiCN is preferred, in brass, copper, bronze and non-alloyed aluminum or other soft gummy materials ZrN (Zirconium Nitride) is preferred.
Aluminum Titanium Nitride (AlTiN – eifeler Varianta) and Titanium Aluminum Carbo-Nitride (TiAlCN – eifeler Variantic) were developed to increase tool life for most exotic or prehardened applications.
The unique stoichiometry of these coatings allows them to operate at elevated temperatures during the cutting process. In addition, eifeler’s Exxtral Blue, Sistral and Crosal were designed to extend tool life beyond the norm in extremely difficult to machine materials.