Improvement in Wear and Corrosive Wear Resistance of Ti6Al4V Alloy by Double Glow Plasma Surface Alloying with W-Mo and W-Mo-N

Abstract

W-Mo and W-Mo-N surface-modified layers on Ti6Al4V alloy were obtained using a double glow plasma surface alloying technique. The morphology, microstructure, and chemical composition distribution of the modified layers were analyzed by scanning electron microscope, Xray diffraction, and glow discharge optical emission spectrometry. The hardness and toughness of the modified layers were measured using a micro-hardness tester, and dynamic repeating press equipment. The wear resistance in ambient air and the corrosive wear resistance in NaCl solution were evaluated using a ball-on-disk wear tester. The results show that W-Mo and W-Mo-N surface modified layers are composed of the alloying layers which vary in composition and phase form along the depth. A microhardness gradient was observed in the modified-surface layers. The surface hardness of the W-Mo-N and W-Mo modified layers was 25.3 and 14.2 GPa, which is seven-fold and 3.9-fold harder than the Ti6Al4V substrate, respectively. W-Mo and W-Mo-N surface-modified layers significantly improved the wear and corrosion resistance of Ti6Al4V. It seems that the wear resistance of W-Mo and W-Mo-N surface-modified layers in NaCl solution is better than that in ambient air owing to the strong lubricating effect of NaCl solution and the excellent corrosion resistance of the modified layers.

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

“…Double glow plasma method of surface alloying was carried out on Ti 6 Al 4 V with W-Mo-N and W-Mo layers [46]. Using several analysis methods like employing a scanning electron microscope and using glow discharge optical emission spectroscopy and X-ray diffraction, chemical composition and morphology were studied.…”

“…[37] Surface alloying by Double glow plasma method. [46] Inhibiting bacterial growth By altering the voltage applied for the treatment of the alloy. [13] Preventing degradation of hip implants Joint fluid aeration, choosing a proper microstructure of the material as well as making sure the mating surfaces have proper tolerance values.…”