On request, the broaches are supplied with surface coatings such as TiN (titanium nitride), TiCN (titanium nitro carbide), TiAlN (titanium aluminum nitride), AlCrN (chromium aluminum nitride), which are among the most used.
The use of the coating on some materials to be broached is in some cases indispensable and, depending on the type, it can protect against wear, increase surface hardness or reduce friction.
Coating can increase tool life, improve the quality of the broached surfaces and increase productivity between sharpening operations.
The characteristics and benefits of the most used coatings are shown below:
