Ti-6Al-2Zr-1Mo-3Nb合金微弧氧化陶瓷膜的结构与性能

利用微弧氧化技术,在Ti-6Al-2Zr-1Mo-3Nb合金表面制备陶瓷涂层。用扫描电镜和X射线衍射仪观察并分析陶瓷膜层的组织形貌和相结构,用电子万能材料试验机和数字万用表研究膜层的结合强度和绝缘性,并用MMS-1G高温高速销盘摩擦磨损试验机和YWX/Q-750盐雾试验机考察涂层的摩擦性能和耐腐蚀性能。结果表明:陶瓷层主要由金红石TiO2相和锐钛矿TiO2相构成,膜基结合强度达到30MPa以上,膜层绝缘性和耐腐蚀性良好,耐磨性得到明显改善,涂层的磨损机制表现为轻微的磨粒磨损与粘着磨损。

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

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