Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 19, Pages 27342-27350Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.156
Keywords
CrAlTiNbV)Nx coatings; Substrate bias; Wear; Aviation lubricant
Categories
Funding
- National Natural Science Foundation of China [51835012, 51805515]
- National Key RD Plan of China [2018YFB0703803]
- program of Science & Technology International Cooperation Demonstrative Base of Metal Surface Engineering along the Silk Road [2017D01003]
- CAS Light of West China
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By controlling the substrate bias, (CrAlTiNbV)Nx coatings can exhibit different crystal structures and properties. Optimum conditions for achieving the lowest friction coefficient and wear rate in aviation lubricant were found to be at substrate biases of -96 V and -126 V, respectively.
The (CrAlTiNbV)Nx coatings are fabricated by controlling the substrate bias via magnetron sputtering method. Under low substrate bias, the coating tends to form a loose columnar crystal structure with (200) preferred orientation. However, when the substrate bias increases, the coating transforms into a dense nanocrystalline structure, and the (111) orientation is enhanced. As the substrate bias increases, the residual stress and hardness of the coating gradually increase, while the adhesion strength decreases slightly. Friction tests show that the coating possesses the lowest average friction coefficient (about 0.06) and wear rate (8.7 x 10-9 mm3/N.m) in 4050# aviation lubricant, which is achieved under the substrate bias of -96 V and -126 V, respectively.
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