Microstructure and Properties of Ceramic Coatings on Ti-6Al-2Zr-1Mo-3Nb Alloys by Micro-arc Oxidation

Abstract:

Ceramic oxide coatings were prepared on the Ti-6Al-2Zr-1Mo-3Nb alloy surface by micro-arc oxidation. The microstructure and phase composition of ceramic coatings were analyzed by means of scanning electron microscopy and X-ray diffraction, respectively. Bonding strength, insulating performance, the tribological properties and corrosion resistance of the coatings were also investigated. Results indicate that the oxide film is mainly composed of rutile TiO2 and anatase TiO2. The bonding strength between the Ti-6Al-2Zr-1Mo-3Nb substrate and the film is over 30 MPa. The ceramic coating shows good insulativity and excellent corrosion resistance. The wear mechanism of the micro-arc oxidation ceramic coating is characterized by slight abrasive wear and adhesive wear