Journal
SURFACE & COATINGS TECHNOLOGY
Volume 146, Issue -, Pages 209-214Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0257-8972(01)01390-1
Keywords
TiN/SiNx; multilayer hard coatings; equiaxed structure; columnar structure; surface roughness; internal stress
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TiN coatings have been widely used in various tribological applications. However, TiN coatings predominantly grow with a columnar grain structure, and these columnar grain boundaries become the sites for crack initiation, resulting in premature failure of TiN coatings. In this paper, we report the use of amorphous SiNx to periodically interrupt the growth of TiN in order to suppress the columnar structure. The growth was performed in a dual-cathode unbalanced reactive magnetron sputtering system. The resulting TiN/SiNx multilayer coatings, when deposited under optimum conditions (TiN layer thickness = 2.0 nm, SiN, layer thickness = 0.5 nm and substrate bias = -80 to -90 V) are smooth and exhibit an equiaxed grain structure with no evidence of columnar growth. The highest hardness is in excess of 45 GPa. (C) 2001 Elsevier Science B.V. All rights reserved.
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