Title of article :
Microstructural characterisation of carbon doped CrAlTiN nanoscale multilayer coatings
Author/Authors :
Li، نويسنده , , Xiaoying and Wu، نويسنده , , Wenwen and Dong، نويسنده , , Hanshan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
9
From page :
3251
To page :
3259
Abstract :
Carbon doped CrAlTiN coatings for reducing the coefficient of friction sliding against a WC-Co ball in air were developed using a closed field unbalanced magnetron sputtering system (CFUMS). The carbon content was controlled by increasing the current of the carbon target power from 0 A to 5 A. The surface morphology, cross-sectional microstructure, phase constituent, chemical bonding energy and mechanical properties of coatings were characterised by means of XRD, SEM, XTEM, XPS, and nanoindentation. The results showed that the hardness, Youngʹs modulus and coefficient of friction (CoF) of the coatings sliding against a WC-Co ball in air decreased with increasing carbon content. Microstructure characterisation revealed that the carbon doped coatings consisted of four sublayers from the substrate to the surface and the main phase formed is fcc B1-NaCl like (Cr, Al, Ti) N and (Cr, Al, Ti) (C, N) phase in sublayers III and IV respectively when the carbon content is below 3.96 at.%. When the carbon concentration exceeds this value, the excessive carbon will begin to form the amorphous carbon (or carbon-riched) phase which leads to a decrease in the coefficient of friction (CoF) of the coatings sliding against a WC-Co ball in air.
Keywords :
Carbon doped CrAlTiN coating , Nanoscale multilayer , TEM characterisation
Journal title :
Surface and Coatings Technology
Serial Year :
2011
Journal title :
Surface and Coatings Technology
Record number :
1823993
Link To Document :
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