退火工艺对纳米AgSnO2触头材料加工性能的影响

用XRD和TEM观察纳米AgSnO。触头材料的组织、成分和结构，研究了退火工艺对纳米AgSnO2触头材料加工性能的影响，并对材料的超塑性、弥散强化和退火热处理特性进行了分析。研究表明：纳米AgSnO2电触头材料的组织中，SnO2粒子弥散细小，分布均匀，不仅减小了SnO2对Ag基体的割裂作用，而且避免了因SnO2富集形成绝缘层而引起的接触电阻升高，从而提高触头材料电性能、电寿命以及抗熔焊、耐电弧烧损的能力。

Influence of Anneal on the Structure and Properties of AgSnO2 Electric Contact Materials

XRD and TEM measurements have been applied to study the composition, structure and heat treatment temperature of the doped nanocrystalline SnO2 powder. The superplasticity, dispersion enhancement and heat treatment anneal properties of the nanocrystalline AgSnO2 electric contact materials have been theoretically analyzed. The results showed that the SnO2 nano-particles are uniformly distributed in the matrix of AgSnOz materials. This character, on the one hand, diminish the dissevering of silver matrix by SnO2, on the other hand, decrease the enrichment of SnO2 particles, which prevents the temperature arising owing to the formation of SnO2 insulation layer, and thus significantly improves the electric properties, such as the electric life, anti-fusion welding ability, electric arc resistance etc., of the materials.