高温球阀喷涂Al_2O_3-TiO_2和WC-Co涂层的耐磨粒磨损性能

Abrasive resistance of sprayed Al_2O_3-TiO_2 and WC-Co coatings on high temperature ball valve

采用激光等离子喷涂技术在已失效的高温球阀基体材料上制备Al2O3-TiO2与WC-Co金属陶瓷涂层,在摩擦磨损试验机上对涂层的耐磨粒磨损性能进行研究,利用扫描电镜、光学显微镜对涂层的显微组织结构、磨损表面及其相组进行分析,并采用维氏显微硬度计、WE-50型液压拉伸验机和箱式电热炉对涂层的显微硬度、结合强度及抗热震性进行测试.结果表明,Al2O3-TiO2金属陶瓷涂层的综合性能最好,可以用于失效高温球阀的再制造.

Al2O3-TiO2 and WC-Co ceramic coatings were deposited on wear-out ball valve by plasma spraying technology. The abrasion wear properties were evaluated on a pin of the disc tribometer. The microstructure, phase compositions and worn surface of the coatings were examined by optical microscope and scanning electron microscope. The microhardness, thermal shock property and bonding strength of the coatings were also tested. Results indicate that the Al2O3-TiO2 ceramic coating has the best combination property. And it can be used to reproduce wear-out high temperature ball valve.