( 1. 昆明理工大學 云南省新材料制備與加工重點實驗室，
昆明 650093;
2. 昆明理工大學 稀貴及有色金屬先進材料教育部重點實驗室，
昆明 650093;
3. 云南省科學技術協(xié)會， 昆明 650021;
4. 昆明貴金屬研究所， 昆明 650221)
摘 要: 研究了銀氧化錫電觸頭材料的反應合成制備以及制備的銀氧化錫電觸頭材料在大塑性變形加工條件下的組織均勻化過程。 XRD、 SEM、 TEM和能譜分析結果表明， 反應合成制備的銀氧化錫電觸頭材料的顯微組織為納米氧化錫團聚顆粒生長在銀基體顆粒的周圍形成大基體、 小顆粒的環(huán)狀。 通過對反應合成銀氧化錫電觸頭材料在真應變?yōu)?和12大塑性變形條件下顯微組織的研究， 發(fā)現(xiàn)經(jīng)過大塑性變形加工技術能夠對銀氧化錫電觸頭材料顯微組織起到均勻化和彌散化作用， 且真應變?yōu)?2的AgSnO2觸頭材料的組織均勻化程度與抗拉強度都好于真應變?yōu)?的AgSnO2觸頭材料的。
關鍵字: AgSnO2觸頭材料； 反應合成； 大塑性變形
ZHANG Kun-hua4, DU Yan1, 2
（ 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
