((1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；2. 貴研鉑業(yè)股份有限公司，昆明 650106))
摘 要: 測(cè)試Ag-SnO2觸點(diǎn)材料的加工性能和力學(xué)性能，借助掃描電鏡(SEM)、能譜分析(EDS)和透射電鏡(TEM)研究Ag-SnO2觸點(diǎn)材料經(jīng)過(guò)不同次數(shù)擠壓后顯微組織的變化，觀察和分析材料中SnO2顆粒的分布及尺寸變化，得出Ag-SnO2觸點(diǎn)材料性能與顯微組織之間的關(guān)系。累積大塑性變形加工能夠?qū)?/SPAN>Ag-SnO2觸點(diǎn)材料的顯微組織起到均勻化和彌散強(qiáng)化作用，從而使Ag-SnO2觸點(diǎn)材料的抗拉強(qiáng)度隨擠壓次數(shù)的增加而降低，伸長(zhǎng)率隨擠壓次數(shù)的增加而提高。
關(guān)鍵字: Ag-SnO2觸點(diǎn)材料；復(fù)擠壓；顯微組織；力學(xué)性能
（(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Sino-Platinum Metals Co.,Ltd., Kunming 650106, China)）
Abstract:The working property and mechanical property of Ag-SnO2 contact materials were tested, the changes of their microstructure were studied by scanning electron microscopy, electron energy spectrum analysis, and transmission electron microscopy. The distribution and particle size change of SnO2 were also observed, the relation between the property and microstructure was noted, the influence mechanism of multiple extrusion on the properties and microstructure was explanted. After deformed by cumulative plastic deformation, SnO2 particles are homogenous and more dispersed in Ag-SnO2 composites. With increasing extrusion times, the tensile strength is reduced, while the elongation is increased.
Key words: Ag-SnO2 contact materials; multiple extrusion; microstructure; mechanical property
