锡元素对925银性能影响的研究  

Effect of Tin Addition on the Properties of 925 Silver Alloys

作　　者：于奇[1] 钟素娟[1] 马佳[1] 龙伟民[1] 

机构地区：[1]郑州机械研究所,郑州450001

出　　处：《贵金属》2017年第B10期63-69,共7页Precious Metals

基　　金：国家国际科技合作专项(2015DFA50470)

摘　　要：采用含锡量0%~5%的首饰铸造用铜基补口合金制备6种925银,通过对比检测925银流动性、白度、显微硬度、拉伸强度,分析微观组织成分,对比观察抗硫化腐蚀能力。实验结果表明,铜基补口合金中锡元素含量在4%时925银合金拉伸强度最高,锡含量在1%~3%时拉伸强度呈线性增加;随着锡含量提高925银合金流动性提高,显微硬度增加,抗硫化变色性能提升,合金的白度和亮度降低,色差增大;通过微观组织观察,随着锡含量增加在相界面处形成二次析出高锡固溶体组织,影响合金拉伸强度,含锡固溶体组织白度及亮度低于Ag-Cu-Zn固溶体组织。6 kinds of 925 silver alloys were prepared by casting copper-based master alloy with tin content of 0%~5%, the fluidity, whiteness, micro-hardness and tensile strength were compared, the microstructure and the corrosion resistance of the 925 silver alloys were observed. The experimental results show that the highest tensile strength of 4% tin addition on the copper-based alloy in 925 silver alloys, the tensile strength increase linearly when added 1%~3% tin. With the increase of tin content in the 925 silver alloys, the micro-hardness, the anti tarnish property of which were elevated, the whiteness and brightness decreased and the chromatic aberration enlarged. Through the observation of microstructure, with tin content increase formed two separated high tin solid solution phase in the interface, the effect of alloy tensile strength, Sn solid solution whiteness and brightness is lower than that of Ag-Cu-Zn solid solution.

关 键 词：铜基补口合金 925银 拉伸强度 显微硬度 微观组织 

分 类 号：TG172[金属学及工艺—金属表面处理]