中文摘要：

将质量比为1∶1的Ti B2硬质相和Co粘结相通过机械球磨方式制备Ti B2-50Co金属陶瓷复合粉末,将所制备的复合粉末通过超音速火焰喷涂技术（HVOF）在不同的燃气流量下沉积3种Ti B2-50Co涂层,采用扫描电子显微镜（SEM）和X射线衍射仪（XRD）对所制备的粉末和不同涂层的显微组织和相组成进行了表征,探讨了燃气流量对涂层的组织结构、硬度值、耐磨损和耐熔融铝硅腐蚀性能的影响。结果显示,3种涂层呈典型的层状结构,涂层均具有较好的致密性,其中以燃气流量为30 L·min-1的涂层孔隙率最低,涂层与基体之间结合良好。3种涂层的主要物相与所制备的复合粉末相同,仍为Ti B2和Co两相;3种涂层的硬度值明显高于Q235钢,其中燃气流量为30 L·min-1的涂层硬度值最大（HV0.3（583±71））。3种涂层均具有良好的耐磨损和耐熔融铝硅腐蚀性能,其中燃气流量为30 L·min-1的涂层磨损失重量仅为0.98mg,腐蚀后涂层的主要物相未发生改变,仍然为Ti B2和Co两相。

英文摘要：

TiB2-50Co cermet composite particles with the mass ratio of 1：1 for TiB2 ceramic phase and Co binder phase were fabrica- ted by mechanical alloying. Three kinds of TiB2-50Co coatings were fabricated by high velocity oxygen fuel（HVOF） method under dif- ferent propane flow rates. The microstructure and phase compositions of TiB2-50Co powder and coatings were characterized by scanning electron microscope （SEM） and X-ray diffraction （XRD） and the effects of propane flow rate on the microstructure, microhardness, abrasive and corrosion resistance of TiB2-50Co coatings were discussed. The results revealed that the three kinds of TiB2-50Co coatings with typical layer structure had denser structure, especially the coating with propane flow rate of 30 L·min-I had the lowest porosity and the coatings had good bonding to the substrate. The main phases of TiB2-50Co coatings were TiB2 and Co, which was similar with those of the powder. The microhardness of TiB2-50Co coatings was higher than that of Q235 substrate ; especially the coating with propane flow rate of 30 L.min-1 had the highest microhardness （HV03 （583±71 ））. The three kinds of TiB2-50Co coatings had good abrasive wear performance and durability in the molten Al-12.07% Si, the weight loss of the coating with propane flow rate of 30 L·min-1 was 0.98 mg, and the phase compositions of the three kinds of TiB2-50Co coatings were also TiB2 and Co.