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为了研究NiCoCrAlY/Al_2O_3-30%B4C复合涂层的摩擦磨损性能,采用化工冶金包覆、离心喷雾造粒和固相合金化技术制备了NiCoCrAlY/Al_2O_3-30%B4C复合粉体,并采用等离子喷涂技术制备了NiCoCrAlY/Al_2O_3-30%B4C复合涂层,采用SEM、XRD和摩擦磨损试验机对涂层的结构和性能进行了研究。结果表明,NiCoCrAlY/Al_2O_3-30%B4C复合涂层呈典型的层状结构,涂层的主晶相为NiCoCrAlY、B4C和Al_2O_3相。随温度升高,涂层摩擦系数逐渐增大,涂层磨损率先增大后降低。低温下,涂层的主要磨损机制为磨粒磨损和脆性断裂;高温下为磨粒磨损、氧化和金属氧化物的转移。
In order to study the friction and wear properties of NiCoCrAlY / Al_2O_3-30% B4C composite coating, NiCoCrAlY / Al_2O_3-30% B4C composite powders were prepared by chemical metallurgy coating, centrifugal spray granulation and solid-phase alloying. Plasma spraying The NiCoCrAlY / Al_2O_3-30% B4C composite coating was prepared and the structure and properties of the coating were studied by SEM, XRD and friction and wear testing machine. The results show that NiCoCrAlY / Al_2O_3-30% B4C composite coating is a typical layered structure, the main phase of the coating is NiCoCrAlY, B4C and Al_2O_3 phase. With the increase of temperature, the friction coefficient of the coating gradually increases, the wear rate of the coating first increases and then decreases. At low temperature, the main wear mechanism of the coating is abrasive wear and brittle fracture; at high temperature abrasive wear, oxidation and metal oxide transfer.