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| The hardess degradation of naocomposite Ti-Si-N coatings induced by oxygen impurity and its mechanisms |
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| 西安交通大学 |
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Cite this article:
;. The hardess degradation of naocomposite Ti-Si-N coatings induced by oxygen impurity and its mechanisms. Chin J Mater Res, 2008, 22(3): 287-290.
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Abstract There has been a wide attention in nanocomposite coatings with interface phases because of their superhardness, but the limitation hardness that this kind of materials can achieve was still an argued question by many researchers. In this paper, we observe the limitation hardness of nanocomposite coatings is very sensitive to microstructure of interface. It is shown that a dependent relation between hardness and oxygen impurity content of coatings resulted from our experiments. Based on an atomic model analysis, the decreasing of hardness caused by a small amount of oxygen impurities can be explained by oxygen atoms induce weakening of the Si3N4 interface which acts as a “glue” between the TiN nanocrystals. Further, we conclude that density of oxygen atoms around grain boundary is a dominant factor on hardness degradation of the films
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Received: 28 June 2007
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