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On Separating Bonding Strength From Film and Substrate Properties

Published online by Cambridge University Press:  21 February 2011

Jia-Wen He ,
B. C. Hendrix ,
Mao-Zhong Yi  and
Nai-Sai Hu
Jia-Wen He
Affiliation:
National Laboratory for Mechanical Behavior of Metallic Materials, Xi’an Jiaotong University, Xi’an 710049, China
B. C. Hendrix
Affiliation:
National Laboratory for Mechanical Behavior of Metallic Materials, Xi’an Jiaotong University, Xi’an 710049, China
Mao-Zhong Yi
Affiliation:
National Laboratory for Mechanical Behavior of Metallic Materials, Xi’an Jiaotong University, Xi’an 710049, China
Nai-Sai Hu
Affiliation:
National Laboratory for Mechanical Behavior of Metallic Materials, Xi’an Jiaotong University, Xi’an 710049, China
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Abstract

Bonding strength is commonly measured by various kinds of single cycle tests such as scratch tests or indentation tests. These tests all reflect complex composite properties - both plastic and elastic properties of the film and the substrate - as well as the bonding strength. In many cases experimental critical value of these single cycle tests is controlled by film or substrate strength or ductility rather than bonding strength. In these cases, the single cycle test should be evaluated in terms of the specific property which controls failure and should not be taken as a measure of “bonding strength.” However, the interfacial fatigue strength measured at 5X106 cycles is shown to be measurable over a large range of bonding strengths and composite properties. And further, this interface fatigue strength is insensitive to the composite properties. The complementary nature of these two types of tests is demonstrated for various TiN-based hard coatings on various steel and cemented carbide substrates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 881
Copyright
Copyright © Materials Research Society 1995

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References

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