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Influence of Deposition Positions on Fretting Behaviors of DLC Coating on Ti-6Al-4V
Tribology Transactions ( IF 1.511 ) Pub Date : 2019-09-11 , DOI: 10.1080/10402004.2019.1654585
Hao-Hao Ding, Vincent Fridrici, Gaëtan Bouvard, Jean Geringer, Julien Fontaine, Philippe Kapsa

The influence of diamond-like carbon (DLC) coating positions—coated flat, coated cylinder, and self-mated coated surface tribopairs—on the fretting behaviors of Ti-6Al-4V were investigated using a fretting wear test rig with a cylinder-on-flat contact. The results indicated that, for tests without coating (Ti-6Al-4V–Ti-6Al-4V contact), the friction (Qmax/P) was high (0.8–1.2), wear volumes were large (0.08–0.1 mm3) under a large displacement amplitude of ±40 µm and small (close to 0) under a small displacement amplitude of ±20 µm, and the wear debris was composed of Ti-6Al-4V flakes and oxidized particles. For tests with the DLC coating, under low load conditions, the DLC coating was not removed or was only partially removed, Qmax/P was low (≤0.2), and the wear volumes were small. Under high load conditions, the coating was entirely removed, Qmax/P was high (0.6–0.8), and the wear volumes were similar to those in tests without coating. The wear debris was composed of DLC particles, Ti-6Al-4V flakes, and oxidized particles. The DLC coating was damaged more severely when deposited on a flat surface than when deposited on a cylindrical surface. The DLC coating was damaged more severely when sliding against a DLC-coated countersurface than when sliding against the Ti-6Al-4V alloy.

更新日期:2019-09-11

 

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