J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (11): 1409-1415.DOI: 10.1016/j.jmst.2017.10.001

• Orginal Article • Previous Articles     Next Articles

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

Zuo Zongshia, Hu Bonianb*(), Chen Hongc, Dong Qizhia, Yu Ganga*()   

  1. a State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
    b Department of Materials and Chemical Engineering, Hunan Institute of Technology, Hengyang 421008, China
    c School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China
  • Received:2017-04-27 Revised:2017-06-19 Accepted:2017-08-03 Online:2017-11-20 Published:2018-01-25
  • Contact: Hu Bonian,Yu Gang

Abstract:

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 AgNO3 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.

Key words: Composite powders, Nickel coated diamond, Activator, Direct electrodeposition, Phase structure, Tribological property