Carbide indexable slitting blades are now using chemical vapor deposition coated with titanium carbide, titanium nitride, alumina hard layer or composite hard layer. Slitting machine blade is the development of physical vapor deposition method not only can be used for the carbide slitting machine blade with also be used for high-speed steel slitting machine blade tools, such as drills, hobs, taps and milling, slitting machine blade. The hard coating as a barrier to impede chemical diffusion and thermal conduction, so that the tool wear in cutting speed slows down, the coating life of the blade is not coated compared to about 1 to 3 times or more.

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