METALS AND METAL MATRIX COMPOSITES |
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Research Progress in Color and Technology of Au Based Materials for Jewelry |
YU Jie1, LU Jinkang1, CUI Xiaoying2, YE Wei1, PU Rui1, ZHOU Xiaolong1
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1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650031, China 2 Analytic and Testing Research Center of Yunnan, Kunming 650201, China |
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Abstract The noble metals used in jewelry generally fall into two categories in terms of their intrinsic and surface color. Here, the latest progress in preparation and technology of carat gold are reviewed according to their corresponding color, composition and mechanical properties. A significant effect on the color, machinability and microstructure of carat gold can be achieved via the introduction of the RE ions or other minor elements, which is further demonstrated to reduce the hardness and improve the plasticity of intermetallic compounds, such as AuAl2. Moreover, the surface coating technology on carat gold has been developed from traditional electroplating, Span gold to surface oxidation and laser surface nanocrystallization of Au alloy. Compared with the above technologies, the metallic glass and electroforming technologies have obvious advantages on the improvement of hardness and corrosion resistance of carat gold, among which the metallic glass process provides a facile approach to obtain Au with different hardness by adjusting the rapid cooling rate. In addition, the gold jewelry with a hollow feature through the employed metal electroforming technology, realizing a gold-saving fundamentally, where the composition of liquid organic additives and their function in the process play a critical role.
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Published: 25 June 2022
Online: 2022-06-24
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Fund:National Natural Science Foundation of China (51764030), and Talent Training Project of Kunming University of Science and Technology(KKZ3201751043). |
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