Abstract
Ti-Al-N composite coatings were in-situ synthesized on TC4 surfaces by laser cladding. The oxidation behaviors and wear properties of the as-obtained composite coatings and TC4 matrix were studied at various temperatures. The results showed the formation of a TiO2-dominated multilayer film on the composite coating surface at temperatures below 800 °C. The oxidation product of the coating contained a mixed oxide layer of TiO2 and Al2O3 at 900 and 1000 °C. The coatings exhibited good oxidation resistance at high temperatures. The thickening of the oxide film and distribution of the self-lubricating phase Ti2AlN in the coating decreased the friction coefficient to 0.2091. Also, the wear rate diminished to 0.025×10−4 mm3·N−1·m−1 at 800 °C, which is 1.43% that of the TC4 substrate. In the tested temperature range, the composite coatings showed mainly abrasive wear behavior, while an obvious lubrication effect was observed for oxide at high temperatures.
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