期刊
APPLIED SURFACE SCIENCE
卷 328, 期 -, 页码 133-139出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2014.11.129
关键词
Bonding; Boronizing; Nanodiamond; CVD; Thin-film; Cobalt-chromium
类别
资金
- National Science Foundation Partnerships for Innovation: Building Innovation Capacity (PFI: BIC) subprogram [IIP-1317210]
- National Aeronautics and Space Administration (NASA) - Alabama Space Grant Consortium , Research Experiences for Undergraduates (REU) [NNX10AJ80H]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1317210] Funding Source: National Science Foundation
Chemical vapor deposited (CVD) diamond coatings can potentially improve the wear resistance of cobalt-chromium medical implant surfaces, but the high cobalt content in these alloys acts as a catalyst to form graphitic carbon. Bonding by high temperature liquid baths and powder packing has been shown to improve CVD diamond compatibility with cobalt alloys. We use the microwave plasma-enhanced (PE) CVD process to deposit interlayers composed primarily of the borides of cobalt and chromium. The use of diborane (B2H6) in the plasma feedgas allows for the formation of a robust boride interlayer for suppressing graphitic carbon during subsequent CVD of nano-structured diamond (NSD). This metal-boride interlayer is shown to be an effective diffusion barrier against elemental cobalt for improving nucleation and adhesion of NSD coatings on a CoCrMo alloy. Migration of elemental cobalt to the surface of the interlayer is significantly reduced and undetectable on the surface of the subsequently-grown NSD coating. The effects of PECVD bonding are compared for a range of substrate temperatures and deposition times and are evaluated using glancing-angle X-ray diffraction (XRD), cross-sectional scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and micro-Raman spectroscopy. Bonding of CoCrMo results in adhered nanostructured diamond coatings with low surface roughness. (C) 2014 Elsevier B.V. All rights reserved.
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