Surface modification of Ti6Al4V alloy by PIII at high temperatures: Effects of plasma potential


Surface modification of Ti6Al4V alloy by PIII at high temperatures: Effects of plasma potential

Silva, M. M.; Ueda, M.; Pichon, L.; Reuther, H.; Lepienski, C. M.

The present work is aimed to analyzing the influence of the plasma potential in the efficiency of plasma immersion ion implantation (PIII) process with nitrogen, at high temperatures (550 degrees C and 800
degrees C), applied to the Ti6Al4V alloy to increase its wear resistance. Treatments with plasma potentials (PP) at 420 V and 90 V were carried out. In the first case, in accordance with AES (Auger Electron Spectroscopy) analysis, nitrogen rich layers of 100 nm and 150 nm of thickness had been obtained, for total treatment times of 60 min and 120 min, respectively. For the treatments with lower PP of 90 V, the treated layers thicknesses have been measured by GDOS (Glow Discharge Optical Spectroscopy) and their values are 1 mu m and 1.5 mu m for treatments of 120 min and 240 min, respectively. The hardness values were determined for the samples treated with high PP by nanoindentation technique and a significant increase was observed for this treatment,
reaching 11 GPa (60 m! in) and 19 GPa (120 min), which can be compared to 3.5-4.0 GPa obtained for the untreated samples. Pin-on-disk wear tests show that wear resistance increases after all these treatments. The friction coefficient as well as the wear rates are measured with a tribometer.

  • Nuclear Instruments and Methods in Physics Research B 257(2007), 722-726

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Publ.-Id: 10324