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RESEARCH PAPERS

Fracture Mechanisms of Ceramic Coatings in Indentation

[+] Author and Article Information
D. F. Diao

Department of Machine Intelligence and Systems Engineering, Tohoku University, Sendai, Japan

K. Kato

Laboratory of Tribology, School of Mechanical Engineering, Tohoku University, Sendai, Japan

K. Hokkirigawa

Department of Mechanical Engineering System, Yamagata University, Yonezawa, Japan

J. Tribol 116(4), 860-869 (Oct 01, 1994) (10 pages) doi:10.1115/1.2927346 History: Received April 22, 1992; Revised January 14, 1994; Online June 05, 2008

Abstract

Indentation tests on ceramic coatings are carried out in this paper and fracture pattern diagrams as a function of normal load and coating thickness are introduced for Al2 O3 and TiN coatings deposited on cemented carbide substrates. Ring cracks are observed in indentation with a blunt indenter (1.5 mm radius), while lateral and radial cracks are observed in indentation with a sharp indenter (0.2 mm radius). The mechanisms for generating ring and lateral cracks are analyzed using elastic theory and equations predicting the critical loads for crack generation are introduced. The effective elastic modulus Eeff , is introduced for this analysis as a new elastic parameter for a coated surface. The results show that the theoretically calculated critical loads for crack generation agree well with the experimental ones.

Copyright © 1994 by The American Society of Mechanical Engineers
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