Abstract
The surface of Ti6Al4V alloy was modified using the pack boriding at temperatures of 950–1100 °C with an interval of 50 °C for 5, 10, 20 and 30 h in a powder mixture. The surface and boride layers were examined by scanning electron microscopy, X-ray diffraction, electron probe microanalysis, micro-hardness tester and universal wear and friction tester. Growth kinetics of boride layers on the surface of Ti6Al4V alloy were modelled with two diffusion models of d2 = Dt and d = kt0.5 based on the experimental boride layer thicknesses, boriding times and temperatures. The total thickness of boride layer was determined by TiB layer at T < 1050 °C and by TiB2 layer at T ≥ 1050 °C. The diffusion model of d = kt0.5 turned out more accurate in predicting the thicknesses of boride layers. The diffusion activation energy for B in TiB2 layer was calculated as 231.177 kJ mol−1. The borided Ti6Al4V alloy at 1100 °C for 10 h showed the largest surface hardness and smallest coefficient of friction due to its quite smooth and compact surface.
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