Nanostructure and properties of TiC/a-C: H composite coatings
作者： Y.T. Pei , D. Galvan , J.Th.M. De Hosson
DOI: 10.1016/J.ACTAMAT.2005.05.045
关键词:
摘要: Abstract TiC/a-C:H nanocomposite coatings, deposited with closed-field unbalanced magnetron sputtering, have been scrutinized atomic force, scanning and high-resolution transmission electron microscopy, nanoindentation tribo-tests. These coatings consist of 2–5 nm TiC nanocrystallites embedded in an amorphous hydrocarbon (a-C:H) matrix. A transition from a columnar to glassy microstructure has observed the increasing substrate bias or carbon content. Microcracks induced by sliding wear readily propagate through column boundaries whereas without exhibit substantial toughness. The toughening achieved effectively on two different scales, namely restraining formation columns microscale manipulating nanostructure nanoscale. hardness ( H ) elastic modulus E are found increase monotonically bias, ratio / remains approximately constant. In contrast, increases C Ball-on-disc tribo-tests confirm that possess superior resistance strong self-lubrication effects coefficient friction as low 0.05 ambient air below 0.02 dry air, under against uncoated bearing steel balls. Physical arguments presented explain mechanism ultra-low friction.
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