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为了深入研究纳米Al_2O_3-13%TiO_2(AT13)涂层的组织、性能与喷涂工艺参数之间的关系,采用正交试验法对等离子喷涂工艺的电流、电压、送粉率和喷涂距离等参数进行了优化,在涂布刮刀表面制备了纳米AT13涂层。采用金相显微镜,SEM,EPMA和XRD等对纳米AT13涂层的组织、磨粒磨损性能和结合强度进行了分析。结果表明:纳米AT13涂层均匀致密,孔隙率低;涂层存在全熔和半熔双态结构特征,相结构明显,以稳定相α-Al_2O_3和Rutile-TiO_2为主,存在亚稳态γ-Al_2O_3相结构转变;涂层与基体以机械结合为主,结合强,耐磨性良好;涂层表面应力以残余压应力为主。
In order to further study the relationship between the microstructure and properties of the nano-Al_2O_3-13% TiO_2 (AT13) coating and the spray process parameters, the parameters of plasma spray process such as current, voltage, powder feeding rate and spray distance were studied by orthogonal test Optimized, a nano AT13 coating was prepared on the surface of the doctor blade. The microstructure, wear resistance and bond strength of AT13 coating were analyzed by metallographic microscope, SEM, EPMA and XRD. The results show that the nano-AT13 coating is uniform and compact with low porosity. The coating has all-melting and half-melting bimorphs with obvious phase structure. The metastable γ- Al 2 O 3 phase transformation; the coating and the matrix are mainly mechanical bonding, combined with strong, good wear resistance; coating surface stress mainly residual compressive stress.