Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 27, Issue 3, Pages 611-614Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2008.09.014
Keywords
Vanadium carbide; Hard coatings; Microstructure; Mechanical properties; Magnetron sputtering
Funding
- National Natural Science Foundation of China [U0774001]
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Vanadium carbide coatings with different carbon contents were synthesized in Ar-C2H2 mixture by reactive magnetron sputtering. Energy-dispersive X-ray analysis, X-ray diffraction analysis, scanning electron microscopy, atomic force microscopy and nanoindentation were employed to investigate the effect of C2H2 partial pressure on the composition, phase, microstructure and mechanical properties of the coatings. The results show that vanadium carbide coatings can be synthesized at a low partial pressure of C2H2. The c-VC coating with columnar crystal is obtained when the proportion Of C2H2 partial pressure is only similar to 3% in the mixture. It reaches the peak hardness of 35.5 GPa and elastic modulus of 358 GPa, respectively. The presence of excessive carbon with increased C2H2 partial pressure in the h-VC coating leads to the significant decrease of hardness and elastic modulus. (C) 2008 Elsevier Ltd. All rights reserved.
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