银氧化锡触点材料的水热制备及组织分析

Hydrothermal preparation and microstructure analysis of silver tin oxide contact materials

利用水热法制备AgSnO2粉体,压制烧结后制得AgSnO2块体样品.对AgSnO2粉体样品进行X射线衍射、扫描电镜和能谱分析,结果表明:通过在溶液体系中实现银和二氧化锡的共沉积,水热法能制得颗粒细小均匀的球形AgSnO2复合粉体.块体样品X射线衍射谱表明,水热法制备的AgSnO2粉体由于改变了Ag和SnO2的结合状态,烧结时二氧化锡晶体在(110)晶面上表现出一定的择优取向.对块体样品的显微组织分析表明,AgSnO2块体样品能够克服氧化物的聚集,二氧化锡颗粒在银基体中均匀弥散分布.

After AgSnO2 powders prepared by hydrothermal method being pressed and sintered, AgSnO2 contact materials were obtained. X-ray diffraction, scanning electron microscopy （SEM） and energy-dispersive X-ray （EDX） analysis were used for the AgSnO2 powders. It is indicated that AgSnO2 composite powders with finer size and spherical can be prepared by hydrothermal method by means of the co-precipitation of Ag and SnO2 in aqueous systems. As a result of changing the combination states of silver and tin oxide, the tin oxide crystals show preferred orientation in （110） plate by X-ray diffraction. Microstructure analysis by optical micrograph shows that the AgSnO2 composite bulks have the microstructure with SnO2 particles dispersed on the silver matrix equably.