Jump to main content
Jump to site search

Issue 26, 2011
Previous Article Next Article

Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings

Author affiliations

Abstract

Grown by reactive unbalanced magnetron sputtering in a mixed N2 and CH4 gaseous medium, heterogeneous nanocomposite coatings in the Ti–Al–V–N–C system show extraordinarily excellent tribological performance of coated machining tools. Using analytical high-resolution TEM, EELS, FEG-SEM, XRD, and Raman spectroscopy, this paper reports detailed structural and chemical characterization of the coatings grown at various CH4 : N2 ratios. Meanwhile, the mechanical and tribological properties were also measured, including hardness, Young's modulus, residual stress and the dry-sliding friction and wear at varying environmental humidity. When CH4 gas was introduced in the deposition, the structure of the coatings has been found to experience a change from nano-scale TiAlN/VN multilayer architecture to a complex mixture of columnar grains of nc-TiAlV(N,C)/a-C nanocomposites and inter-column network of sp2-type amorphous carbon. Carbon incorporation and segregation also shows remarkable influence on the columnar growth model by leading to finer grain size. As compared to the carbon-free nitride coating, the nanocomposite coatings showed substantially reduced residual stress owing to the free-carbon precipitation, whereas the coatings maintained comparable hardness to the carbon-free TiAlN/VN. Their tribological properties were found to be strongly dependent on the environment. In humid air at RH > 30%, the coatings showed low friction coefficient less than 0.4 and extremely low wear rate at a scale of ∼10−17 m3N−1 m−1.

Graphical abstract: Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 16 Feb 2011, accepted on 20 Apr 2011 and first published on 03 Jun 2011


Article type: Paper
DOI: 10.1039/C1JM10707K
Citation: J. Mater. Chem., 2011,21, 9746-9756
  •   Request permissions

    Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings

    Q. Luo, S. C. Wang, Z. Zhou and L. Chen, J. Mater. Chem., 2011, 21, 9746
    DOI: 10.1039/C1JM10707K

Search articles by author