Abstract
A mixture of TiO2 powder with Al and B4C powders has been used as a pre-placed precursor to synthesize TiB2–TiC–Al2O3 ceramic composite coating by laser triggered self-propagating high-temperature synthesis (SHS) on AISI 1020 steel surface. In order to investigate the effect of TiO2 powder size on the properties of resulting composite coatings, commercially available micron-sized TiO2 and sol–gel derived nano-sized TiO2 powders has been considered separately in the precursor. XRD (X-ray diffraction), FESEM (Field Emission Scanning Electron Microscopy), TEM (Transmission Electron Microscopy) analysis have been carried out for metallurgical characterization of the produced coating. Micro-hardness measurement and dry sliding wear test have been performed to evaluate the surface mechanical characteristic of in-situ composite coatings synthesized with different type powder combination at various laser processing velocity. Experimental results revealed that, coatings produced with sol–gel derived nano-sized TiO2 exhibit superior mechanical properties (i.e. hardness and wear resistance) than those of the coatings produced with commercially available micron-sized TiO2.
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