( 1. 昆明理工大学 云南省新材料制备与加工重点实验室，
昆明 650093;
2. 昆明理工大学 稀贵及有色金属先进材料教育部重点实验室，
昆明 650093;
3. 云南省科学技术协会， 昆明 650021;
4. 昆明贵金属研究所， 昆明 650221)
摘 要: 研究了银氧化锡电触头材料的反应合成制备以及制备的银氧化锡电触头材料在大塑性变形加工条件下的组织均匀化过程。 XRD、 SEM、 TEM和能谱分析结果表明， 反应合成制备的银氧化锡电触头材料的显微组织为纳米氧化锡团聚颗粒生长在银基体颗粒的周围形成大基体、 小颗粒的环状。 通过对反应合成银氧化锡电触头材料在真应变为4和12大塑性变形条件下显微组织的研究， 发现经过大塑性变形加工技术能够对银氧化锡电触头材料显微组织起到均匀化和弥散化作用， 且真应变为12的AgSnO2触头材料的组织均匀化程度与抗拉强度都好于真应变为4的AgSnO2触头材料的。
关键字: AgSnO2触头材料； 反应合成； 大塑性变形
（ 1. Key Laboratory of Advanced Materials of Yunnan Province,
Kunming University of Science and Technology, Kunming 650093, China;
2. Key Laboratory of Rare-Precious and Nonferrous Metal Advanced Materials,
Ministry of Education, Kunming University of Science and Technology,
Kunming 650093, China;
3. Association for Science and Technology of Yunnan Province,
Kunming 650021, China;
4. Kunming Institute of Precious Metal, Kunming 650221, China）
Abstract: The fabrication of silver tin oxide by reactive synthesis and the microstructure homogenization of reactive synthesis silver tin oxide in the severe plastic deformation were researched. The results of XRD， SEM， TEM and EDX analysis show that the microstructure character of the silver tin oxide is ring shape with bigger matrix and smaller oxide particle formed through the nano-particle of tin oxide accumulating around silver matrix particle. The microstructure change in the severe plastic deformation was researched. The results show that the microstructure can be homogenized by severe plastic deformation, and the homogenization degree and tensile strength under true strain 12 are better than that under true strain 4.
Key words: AgSnO2 contact materials; reactive synthesis; severe plastic deformation
