MoN-Ag nanokompozit kaplamaların tribolojik özellikleri

Ezırmık, Kadri Vefa; Ürgen, Mustafa
April 2010
ITU Journal Series D: Engineering;Apr2010, Vol. 9 Issue 2, p123
Academic Journal
Nanostructured coatings have been recently of great interest because of the possibility of synthesizing unique physical and chemical properties. Different approaches exist for the production of nanostructured coatings such as superlattice coatings, nanoscale multilayer coating, super lattice coating and nanocomposite coatings. The nanocomposite type coatings have attracted the greatest interest by the researchers. Completely new properties are exhibited by nanocrystalline coatings with decreasing the grain size to about 10 nm. The mechanical properties of these materials are determined by processes in boundary regions because the number of atoms in grain is smaller than in the boundary regions. High fracture toughness can be obtained in the nanocomposite structure due to the nano size grain structure. Currently, two main practices exist for the production of nanocomposite coatings. In the first one, the nanocomposite structure is obtained by the combination of two hard and immiscible phases in one coating (e.g., nc-TiN/a-Si3N4; a-TiSi2-nc-TiSi2) while in the other practice, the mixture of one hard (MeN) and one soft (X) immiscible phase (e.g., Zr-Cu-N, Cr-N- Cu, Ti-Cu-N and Mo-Cu-N) are used. In these coatings, one metal may be converted into nitride as a nanocrystalline phase and the other participated in the growing film without any reaction. Nanocomposite coatings based on hard/hard phases have attracted in recent years and there are now numerous studies that deal with the production, characterization, and application of these coatings. The coatings with hard-soft structure have a very promising structure with respect to tribological applications. One can easily formulate these coatings by selecting the hard and soft phase combinations for the required tribological application. Examples of such formulations have been put forward in our research group especially for coating applications suitable for systems working under boundary lubrication conditions. The main approach used in these formulations relies on functioning of the hard phase (such as MoN) as load bearing material and soft phase (copper, silver, tin, antimony etc.) or their compounds. In this study, further verification of this approach is aimed using a hard-soft nanocomposite system based on Mo-N-Ag. …


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