期刊
THIN SOLID FILMS
卷 517, 期 3, 页码 1131-1135出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.07.021
关键词
TiC/a:C; Nanocomposite coatings; Pulsed Magnetron Sputtering (PMS); Wear
类别
资金
- Department of Energy (DOE-OIT)
- Advanced Technology Institute (ATI)
- North American Die Casting Association (NADCA)
TiC/a:C nanocomposite coatings were prepared by reactively Sputtering titanium and graphite targets in pure argon atmosphere using a pulsed closed field unbalanced magnetron sputtering (P-CFUBMS) system. The microstructure of TiC/a:C coatings consisting of nanocrystalline TiC dispersed in an amorphous matrix of free carbon was investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The effects of coating compositions on the structure and properties of TiC/a:C coatings were investigated. In the present study, TiC/a:C coatings exhibit high hardness (24-29 GPa), low coefficient of friction (0.24-0.25) and low wear rate (less than 2.5 x 10(-7) mm(3) N(-1) m(-1)) when the carbon concentration is in the range of 55-66 at.%. Further increase of the carbon content beyond 70 at.% significantly decreased the volume fraction of TiC nanocrystalline and formed a large amount of free amorphous carbon in the coatings. The excessive amorphous carbon phases resulted in a decrease in the coating hardness and the sliding fiction coefficient, e.g. a low COF of 0.15 was obtained when the carbon concentration reached 80.5 at.%. However, the decreased hardness will lead to an increase in the wear rate in these high carbon content TiC/a:C coatings. Published by Elsevier B.V.
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