Abstract
The principles of reactive triode ion plating will be briefly described and examples of new nitride coatings deposited on cutting tools will be given. The coatings discussed include TiN, (Ti, Al)N and ZrN. Their relative order of performance in turning tests will be discussed and microstructural details will be studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It will be shown that, although the best coatings may appear rather uniform and hardly any structural details can be distinguished by SEM, cross-sectional TEM studies always reveal that a very-fine-grained columnar morphology exists in the coatings.
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