Effect of heat treatment on the oxidation resistance of Al-based coatings of titanium ingot

Abstract:

High temperature oxidation resistance coating were prepared by a certain ratio of Al powder, Sn powder, SiO2 powder, styrene acrylic emulsion, polyvinyl alcohol, sodium carboxymethyl cellulose mixed. The effects of different heat treatment temperature and heat treatment time on antioxidant properties were discussed. The microstructure of the exposed surface and spraying surface, coating microstructure, elements diffusion and interface phase structure were analyzed by optical microscope, field emission scanning electron microscopy, energy spectrum analysis instrument and X-ray photoelectron, respectively. The results show that aluminum high temperature oxidation coating effectively prevent surface oxide production formed on the surface of titanium ingot during thermal processing, Al₂O₃-TiAl and TiAl₃-Ti phase with a good protective effect are formed in the interlayer, it is worthy noted that the excellent heat treatment temperature and holding time are 1050 ℃ and 8 h, respectively.