Interface structure of titanium billet surface and high temperature oxidation resistant aluminum-base coatings

Abstract:

Titanium billet surface high temperature oxidation resistant coatings were prepared with Al powder as mainly raw material and Sn powder, SiO2 powder, styrene acrylic emulsion, polyvinyl alcohol, sodium carboxymethyl cellulose as burdening. Subsequently, the coating is sprayed onto the surface of titanium billet, and placed in constant temperature conditions of 1050 ℃ for 8 h, and then in comparison with the surface topography of the flakes with coating or not. The microstructure of the exposed surface and spraying surface analyzed by optical microscope, the coating microstructure and elements diffusion analyzed by field emission scanning electron microscopy and energy spectrum analysis instrument, the interface phase structure analyzed by X- ray diffraction. The results show that titanium billet surface with high temperature oxidation resistant coatings can effectively reduce the thermal processing of titanium billet spalling, the effect of the coating thickness on the thickness of Ti-Al diffusion layer is not significant, the Al2O3-TiAl layers and TiAl3-Ti multilayers co-formed the coating layer, moreover, the excellent coating thickness is about 50 μm .