Microstructure, mechanical and tribological properties of Cr1−xAlxN films deposited by pulsed-closed field unbalanced magnetron sputtering (P-CFUBMS)
2006; Elsevier BV; Volume: 201; Issue: 7 Linguagem: Inglês
10.1016/j.surfcoat.2006.08.090
ISSN1879-3347
AutoresJianliang Lin, Brajendra Mishra, John J. Moore, W.D. Sproul,
Tópico(s)Boron and Carbon Nanomaterials Research
ResumoNanocrystallized Cr1−xAlxN films with various Al contents (0 to 68 at.%) were deposited by pulsed closed field unbalanced magnetron sputtering (P-CFUBMS). The effects of aluminum content on the microstructure, mechanical and tribological properties of the Cr1−xAlxN films have been investigated. It was found that the hardness and elastic modulus of Cr1−xAlxN films increased with increasing Al contents in the films and reached the highest value of 36 GPa and 370 GPa, respectively, at an Al content of 58.5 at.%. Addition of Al beyond 64.0 at.% resulted in a change in crystal structure from B1 cubic to B4 hexagonal phase. The wear resistance improved gradually with the increase of Al in the Cr1−xAlxN films. A combination of the abrasive and adhesive wear mechanism was proposed based on the SEM and EDS analysis of the wear track. The steady state dry coefficient of friction measured against a WC ball for the Cr1−xAlxN films were in the range of 0.36–0.55, and the wear rate was in the 10− 6 mm3 N− 1 m− 1 range.
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