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Sung-Jin Cho, Kwang-Ryeol Lee, K. Eun, J. Hahn, D. Ko (1999)
Determination of elastic modulus and Poisson's ratio of diamond-like carbon filmsThin Solid Films, 341
J. Michler, M. Tobler, E. Blank (1999)
Thermal annealing behaviour of alloyed DLC films on steel: Determination and modelling of mechanical propertiesDiamond and Related Materials, 8
M. Drory, J. Hutchinson (1996)
Measurement of the adhesion of a brittle film on a ductile substrate by indentationProceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 452
Diamond‐like carbon coatings (DLC) combine high wear resistance with low friction coefficients. Both properties enable the protective layers to sustain wide ranges of loading and environmental conditions. At present, low friction coatings are commonly used on an empirical basis but not as a design element. The reason for the empirical approach is the lack of tools for a description of the interaction between the coatings and the substrate. Furthermore it is difficult to obtain information on the fracture properties of the coating substrate system (e.g. fracture toughness, adhesion, residual stresses). A spherical indentation provides a simple technique to measure quantitatively the fracture toughness and the adhesion of brittle coatings on a ductile substrate with standard laboratory equipment. DLC coatings on a 100 Cr 6 steel substrate are indented by silicon nitride balls with different diameters and different loads. Fracture patterns (circular and radial cracks, delamination) are analyzed by finite element calculation and the fracture toughness of the coating itself along with the interface toughness are estimated.
Industrial Lubrication and Tribology – Emerald Publishing
Published: Dec 1, 2002
Keywords: Coating; Component manufacture; Metals
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