Adhesion strength of ductile aluminium and brittle TiN coatings on steel, aluminium and copper, measured by fracture mechanics tests

  • Müller D
  • Cho Y
  • Fromm E
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Abstract

The interface fracture toughness Kc, and the fracture energy Gcof the coating systems of TiN on high speed steel (HSS), and aluminium on austenitic steel, copper and HSS have been measured by the three-point bend test. Kcand especially Gccan be used to characterize the adhesion strength of a coating system. The coatings are produced by a magnetron sputtering process. The coating thickness and a negative bias voltage are chosen to show the effects of the process parameters on the fracture energy. The fracture mechanics data are compared with microhardness and scratch test data obtained from samples subjected to an identical preparation treatment. The results demonstrate that the trends of the experimental data observed with different testing methods can differ strongly, since the contributions of the interface and bulk properties of the coating and the substrate material are quite different. © 1995 Elsevier Science S.A.

Author-supplied keywords

  • Adhesion strength
  • Fracture mechanics
  • Interface fracture energy
  • Magnetron sputtering
  • Thin film

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Authors

  • D. Müller

  • Y. R. Cho

  • E. Fromm

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