Journal
RSC ADVANCES
Volume 6, Issue 58, Pages 53043-53053Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra02370c
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Funding
- National Natural Science Foundation of China [51202261, 51475449]
- National Basic Research Program of China (973 Program) [2013CB632302]
- State Key Laboratory for Mechanical Behavior of Materials Foundation [20141605]
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The doping of Ag nanoparticles in a VN matrix was developed on Inconel 718 and Si (100) substrates using a multi-arc ion plating technique. The microtopographies and microstructures of the as-deposited multilayer VN-VN/Ag and VN coatings were studied using a scanning electron microscope, an X-ray diffractometer, and a transmission electron microscope. The mechanical properties were investigated using a scratch test and a nanoindentation test. The results show that the incorporation of Ag-dopant into a VN coating can promote the decrease of average grain size, and the formation of a diffuse structure in the VN/Ag layer. The lamellar structure of the VN-VN/Ag coating can achieve an enhanced adhesion strength in comparison to the monolayer VN coating, but it has a lower hardness and elastic modulus because of the formation of a high content of soft metallic Ag. Furthermore, tribological testing was performed on a UMT-3 ball-on-disk tribometer, with Al2O3 balls as the counterpart, at room temperature (RT), 300, 500, or 700 degrees C in ambient air. The VN-VN/Ag coating had an excellent self-adaptive lubricating behavior with a decrease of friction coefficient as the temperature increased, but its wear rate showed a drastic increase especially at the high temperature region because of oxidization and a tribochemical reaction. The phase composition of the worn area was investigated using a micro-Raman spectrometer, which indicated a smooth Ag, Magneli phase (V2O5) and bimetallic oxides (Ag3VO4 and AgVO3) were responsible for the decrease of the coefficient of friction in (i) room to mid-range temperatures and (ii) mid-range to high temperatures.
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