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Nanostructured TiC/a-C coatings

Time:2020-07-14 20:53:38  From:  Author:

 Nanocomposite coatings composed of crystalline/amorphous nanophases mixture have recently attracted increasing interests in fundamental research and industrial applications, because of the possibilities of synthesizing a surface protection layer with unique physical–chemical properties that are often not attained in the bulk materials. By controlling the size and volume fraction of nanocrystalline phases in an amorphous matrix and consequently the separation width of amorphous matrix among the nanocrystallites, the properties of the nanocomposite coatings can be tailored, e.g., to make a balance between hardness and elastic modulus to permit close match to the elastic modulus of substrates, and particularly to obtain high toughness that is crucial for applications under high loading contact and surface fatigue. In addition to these characteristics, amorphous carbon (a-C) based nanocomposite coatings exhibit not only excellent wear resistance but also low friction due to self-lubrication effects, which make them environmentally attractive because lubricants can be omitted. This paper focuses on the deposition and characterization of TiC/a-C nanocomposite coatings. Detailed mechanical examinations, including nanoindentations, scratch and tribo-tests, have been performed. Crosssectional and planar TEM observations and energy-filtered TEM are employed to characterize the nanostructure, elements distribution in the coatings and chemistry of the carbon matrix, respectively. The influence of the volume fraction and size distribution of nanocrystalline TiC (nc-TiC) on the coating properties has been examined.

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