FRACTURE MECHANISMS OF CERAMIC COATINGS IN INDENTATION

被引:69
作者
DIAO, DF
KATO, K
HOKKIRIGAWA, K
机构
[1] TOHOKU UNIV, DEPT MACHINE INTELLIGENCE & SYST ENGN, SENDAI, MIYAGI, JAPAN
[2] TOHOKU UNIV, SCH MECH ENGN, TRIBOL LAB, SENDAI, MIYAGI, JAPAN
[3] YAMAGATA UNIV, DEPT MECH ENGN SYST, YONEZAWA, YAMAGATA, JAPAN
来源
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME | 1994年 / 116卷 / 04期
关键词
D O I
10.1115/1.2927346
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
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 Al2O3 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 E(eff), 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.
引用
收藏
页码:860 / 869
页数:10
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