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Effect of activators on the properties of nickel coated diamond composite powders

查看全文 作　　者：Zongshi [1]Zuo;Bonian [2]Hu;Hong [3]Chen;Qizhi [1]Dong;Gang [1]Yu 高影响力作者 机构地区：[1]State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University;[2]Department of Materials and Chemical Engineering, Hunan Institute of Technology;[3]School of Materials Science and Energy Engineering, Foshan University高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2017年第33卷第11期,共7页高影响力期刊 基　　金：funded by the National Natural Science Foundation of China (Nos. 21476066 and 51271074) 摘　　要：Nickel coated diamond composite powders were fabricated via a newly developed direct electrodeposition technique. The effects of activators on the coating of diamond were firstly investigated and diamond grinding wheels were then prepared from Ni-coated diamond composite powders with different activators. The microstructural characterizations of this composite powders were finally conducted by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction, and the mechanical and tribological properties of as-prepared diamond grinding wheels were also measured. There are changes in microstructures and properties of the composite powders with activators. The activator concentration also has an influence on the morphologies and phase structures of the Ni coating on diamond particles.The composite powders with more compact coating of nickel can be prepared by adding 1 g dm^(-3) or more AgNO_3 as an activator to electrodeposit nickel on diamond. The mechanical and tribological properties of diamond grinding wheels were significantly improved when the coating phase structure of Ni crystal grew with(111) plane orientation on the surface of diamond particles. The wheels made from nickel coated diamond composite powders possessed the advantages of easy preparation and outstanding tribological properties. Therefore, Ni coated diamond composite powders exhibit a great potential to be extensively applied in diamond cutting and grinding tools. 关 键 词：合成粉末 镍涂的钻石 使活跃之物 指导电极淀积 阶段结构 Tribological 性质
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