【摘要】 以结晶四氯化锡（SnCl₄·5H₂O）和氢氧化钠（NaOH）为原料，采用水热法在180℃下反应25 h成功地制备了SnO₂实心微球，并通过高能球磨法将SnO₂实心微球与化学Ag粉混合，并进行压制、烧结等工艺处理。考察了表面活性剂种类、水热时间及pH值对SnO₂微球形貌的影响，通过扫描电镜（SEM）、X射线衍射仪（XRD）、透射电镜（TEM）和维氏硬度计、电导率仪等分析手段对产物的形貌、结构及物理性能等进行了表征。结果表明，以十六烷基三甲基溴化铵（CTAB）为表面活性剂，反应温度为180℃、pH值13时，可以得到分散性良好的SnO₂微球，微球为实心状，球形度好，尺寸在1⁴μm之间；与Ag粉经压制、烧结后片材的电阻率为3.18μΩ·cm、密度为71.5 g·cm^-3，均比普通纳米SnO₂粉体与Ag制得的样品性能好。更多还原

【Abstract】 Using SnCl₄·5H₂ O and NaOH as raw materials, SnO₂ microspheres（SnO₂（s））were prepared by a hydrothermal method at 180 oC for 25 h, and Ag-SnO₂（s）electrical contacts material were obtained by high-balling and sintering processes. Effects of surfactants,hydrothermal time and pH on the morphology of SnO₂ microspheres were studied. The morphology, structure and other physical properties of Ag-SnO₂（s）electrical contacts material were characterized by SEM, XRD, TEM, Vickers Hardness Tester and Conductivity Meter. The results show that monodispersed SnO₂ microspheres with a diameter of 1⁴ μm are obtained using CTAB as the template at pH=13 with hydrothermal time for 25 h. The electrical resistivity and density of Ag-SnO₂（s）electrical contacts material are 3.18 μΩ·cm and 71.5 g·cm^-3,respectively, which are better than those of traditional Ag-SnO₂（p）electrical contacts material with nano SnO₂ particulates as the second reinforcement.更多还原