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采用超声波辅助化学镀法在室温条件下制备了Co/Al2O3复合粉体,1200℃下热处理1.5h获得了CoAl2O4尖晶石粉体。用扫描电镜、透射电镜和X射线衍射测定了粉体的微观形貌、成分和相组成;用差热分析法确定了粉体的尖晶石转变温度。结果表明:镀覆制备的Co/Al2O3复合粉体由金属钴和Al2O3两相组成,金属钴相包覆Al2O3相,Co包覆层在Al2O3颗粒表面分布均匀且结构较疏松;复合粉体的尖晶石转变温度为850℃左右;转变后获得的粉体也是一种复合粉体,由Al2O3和CoAl2O4两相组成,由粉体的生长机制可预见,它是以α-Al2O3为核心CoAl2O4尖晶石包覆在其表面的结构。
The Co / Al2O3 composite powder was prepared by ultrasonic assisted electroless plating at room temperature, and the CoAl2O4 spinel powder was obtained by heat treatment at 1200 ℃ for 1.5h. The microstructure, composition and phase composition of the powders were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The spinel transition temperatures of the powders were determined by DTA. The results show that Co / Al2O3 composite powders prepared by plating consist of two phases of metallic cobalt and Al2O3, the metallic cobalt phase covers the Al2O3 phase, and the Co cladding layer is uniformly distributed on the surface of the Al2O3 particles and the structure is loose. The tip of the composite powder Spinel transition temperature of about 850 ℃; powder obtained after transformation is also a composite powder, composed of Al2O3 and CoAl2O4 two phases, the growth mechanism of the powder is predictable, it is α-Al2O3 as the core CoAl2O4 spinel Stone coated structure on its surface.