Title: Characterisation of microcrystalline diamonds deposited by HFCVD

Authors: Tao Zhang; Feng Qin; Wanghuan Qian; Lijun Zhang; Fanghong Sun

Addresses: Mechanical Institute of Technology, Wuxi Institute of Technology, Wuxi 214122, China ' Mechanical Institute of Technology, Wuxi Institute of Technology, Wuxi 214122, China ' Mechanical Institute of Technology, Wuxi Institute of Technology, Wuxi 214122, China ' School of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201316, China ' School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 201316, China

Abstract: The performances of CVD microcrystalline diamond powders by the seeding and self-nucleation method, including the particle size composition, crystal morphology, and diamond purity, are evaluated by the China industry standard of conventional diamond powders (JB/T 7990-2012). The detection results show over 80% particles grown on the seeds exhibit a cubo-octahedral with smooth surfaces and no obvious growth defects, while they can hardly meet the corresponding commercial requirements of particle size composition due to the existence of 10%-23% spontaneous particles (0.5~1.2 μm). For the powders deposited by self-nucleation method, the particle size composition agrees well with the model defined by the industry standard, and 70.5% crystals exhibit the cubo-octahedral or icosahedron morphology, as well as their surface quality are little worse than those grown on the seeds due to unwanted secondary nucleation. Besides, the two types of CVD powders have a high purity detected by micro-Raman spectroscopy.

Keywords: microcrystalline diamond particles; morphology; particle size; hot filament CVD.

DOI: 10.1504/IJAT.2018.094876

International Journal of Abrasive Technology, 2018 Vol.8 No.4, pp.292 - 309

Received: 08 Apr 2018
Accepted: 31 May 2018
Published online: 25 Sep 2018 *

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