Fracture mechanisms of ceramic coatings in indentation

D. F. Diao, K. Kato, K. Hokkirigawa

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

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 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 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.

Original languageEnglish
Pages (from-to)860-869
Number of pages10
JournalJournal of Tribology
Volume116
Issue number4
DOIs
Publication statusPublished - 1994 Oct

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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