电铸硬金的性质研究  

Study on Properties of Electroforming Hard Gold

作　　者：李举子[1] 吴瑞华[1] 

机构地区：[1]中国地质大学珠宝学院,湖北武汉430074

出　　处：《宝石和宝石学杂志》2012年第4期11-15,共5页Journal of Gems & Gemmology

基　　金：中央高校基本科研业务费专项资金(CUG090111)资助

摘　　要：为对电铸硬金产品的有关性质有更全面的认识,采集了3家公司的3件样品,采用ICP-MS、ICP-AES、显微硬度计、金相显微镜、扫描电子显微镜等对样品进行了测试与分析。结果显示:各样品的含金量均大于99.9%,其主要的微量元素为Ag,Cu。3件样品的维氏硬度分别为68.74,71.16,74.97,达不到145。在结构方面,各样品的晶粒尺寸非常细小,以致在扫描电子显微镜下无法分辨,这是其硬度较高的结构基础。表面微形貌起伏不平,有较多孔洞,结构较疏松。内部含有尺寸0.2～3.5μm的夹杂物,样品1的夹杂物主要是CaO和Na2O,样品2和样品3的夹杂物主要是SiO2和Na2O,这与电铸时样品所处的溶液介质有关。样品1热处理前的维氏硬度为68.74,处理后减小为25.94,这与热处理后发生了晶粒的"长大"有关。In order to have a clearer idea about the properties of electroforming hard gold, the authors select three samples of electroforming hard gold from three companies and test them by using ICP-MS, ICP-AES, micro-hardness tester, metallurgical microscope and scanning electron microscope. The results indicate that the content of Au is greater than 99. 9% in each sample, their main trace elements are Ag and Cu. Vickers hardness of the three samples are 68.74,71. 16 and 74. 97 respectively and all of them are lower than 145. In terms of structure, crystalline grains of the samples are so fine that they can not be distinguished even by SEM and the tiny grains are the structural basis for high Vickers hardness. Meanwhile, the surfaces of smaples are uneven with many holes, and their structures are rather loose. There are some inclusions in each sample, the size of the inclusions is between 0.2 μm and 3.5μm. The inclusions in sample 1 are mainly composed of CaO and Na2 O. The inclusions in sample 2 and sample 3 are mainly composed of SiO2 and Na2 O. These results probably are due to the liquid solution where the samples are produced. The Vickers hardness of sample 1 is 68.74 and it is reduced to 25.94 after heat treatment, which is caused by the ＂growing＂ of the crystalline grains after being heated.

关 键 词：电铸硬金 化学成分 维氏硬度 结构 热处理 

分 类 号：TS93[轻工技术与工程]