Abstract
The effects of varied weight fractions of multi-walled carbon nanotubes (MWCNTs) on the dry sliding wear characteristics of Ti6Al4 V were investigated in this study. Dry sliding wear tests were conducted at three applied load levels of 5, 15 and 25 N on spark plasma sintered unreinforced Ti6Al4V alloy and MWCNTs reinforced Ti6Al4V composites containing 1, 2 and 3 wt% MWCNTs respectively sintered at 1000 °C. The ball-on-flat test configuration with tungsten carbide (WC) as the counterface material was used during the tests. Wear scars and debris were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) techniques. It was observed that the wear resistances and coefficients of friction for the composites were significantly improved over that of the unreinforced Ti6Al4V alloy. Worn surface analysis showed the prevalent wear mechanisms at low and high applied loads were adhesive and abrasive wears respectively. Wear debris analysis by EDX showed the presence of tungsten (W), which suggests a transfer layer of the counterface material. Wear resistance enhancement in the composites was directly related to the extent of MWCNTs dispersion within Ti6Al4V matrix, the interfacial bond strength between the matrix and the reinforcement, as well as the presence of hard TiC interfacial product.
Published Version
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