Reliability and Integrity Studies of Superhard Nanocomposite Coatings

Project: Research

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Description

Superhard nanocomposite coatings are presently the high-end coatings in the field of wear resistance applications with their extreme demands. The development of next generation superhard coatings should base on appropriate material design to achieve better combined properties such as high hardness and toughness. In this study, nc-TiN/a-Si3N4 nanocomposite coatings will be prepared by a novel hybrid plasma process combining reactive magnetron sputtering and ion beam source. In addition, ion implantation will be used to pre-treat the substrates for interfacial enhancement, as well as to post-treat the deposited coatings for further improvement of their properties. The coatings will be characterized and assessed systematically in terms of their hardness, fracture toughness, fatigue, adhesion, residual stress, friction, wear, thermal stability and oxidation resistance. In particular, toughening methodologies for the coatings will be explored based on the multilayer design. The effect of coating properties on the resulting utility value of coated tools will be discussed with respect to the available cutting tools made of HSS and cemented carbide and coated with the nanocomposites. It is expected that the reliability and integrity studies of the nanocomposite coatings from both theoretical and experimental points of view will open up new applications including machining and forming operations.

Detail(s)

Project number9440052
StatusFinished
Effective start/end date1/11/0631/03/08