Optimization of the performance of graded amorphous carbon coatings to steel substrates using PECVD

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Authors	SOBOTA Jaroslav BURSIKOVA Vilma GROSSMAN Jan FORT Tomas KLAPETEK Petr BURSIK Jiri FRANTA Daniel PERINA Vratislav
Year of publication	2008
Type	Conference abstract
MU Faculty or unit	Faculty of Science
Citation
Description	For optimization of the performance of the protective coatings there is necessary to optimize the following materials parameters: the elastic modulus, hardness, surface strength, film fracture toughness, impact resistance and film-substrate adhesion. Elastic contact between brittle film and indenting particles may lead to the formation of Hertzian cone cracks. These stresses arise from the radial tensile stresses around the contact area. The resulting strain is difficult to be relaxed and it builds up with increasing film thickness. When the elastic recovery force of the film exceeds a critical value, the stresses in the film are relaxed by cracking or wrinkling resulting in delamination.
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