Abstract
The YSZ (yttria-stabilized zirconia)/TiAlSi composite coatings were successfully fabricated on Ti–6Al–4V alloy substrates by laser cladding technology. The effects of YSZ content on the microstructure and properties of the laser cladding TiAlSi composite coatings were investigated by optical microscope, scanning electron microscope, x-ray diffractometer, hardness tester, as well as friction and wear testing apparatus. The results show that YSZ reinforced Ti-based composite coatings are mainly composed of TiAl, Ti3Al, Ti5Si3, Al2O3, TiO2, SiO2 and ZrO2. With the increase of YSZ content from 0%–5%, the microhardness of the coatings increases, which reaches a maximum of around 803 HV0.3 when the addition content is 5%. The average coefficient of friction of the coating without YSZ is 0.592, while that of the coatings with 1%, 3% and 5% YSZ contents is 0.433, 0.581 and 0.429, respectively. The composite coating with 5% content of YSZ particles possesses the lowest coefficient of friction. The average wear volume loss of the coating without YSZ is 0.78 mm3, which is higher than that of the coatings with the addition of YSZ. The composite coating with 5% content of YSZ particles possesses the lowest wear volume loss. Its worn surface is smoother than the other coatings.
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