Hot filament chemical vapour deposition and wear resistance of diamond films on WC-Co substrates coated using PVD-arc deposition technique |
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| Affiliation: | 1. Departamento de Investigación en Física, Universidad de Sonora, Hermosillo, Sonora 83000, Mexico;2. Materials Science and Engineering, University of Texas-Dallas, Richardson, TX 75080, USA;3. Physics and Astronomy, University of Texas-San Antonio, San Antonio, TX 78249, USA;4. Bioengineering, University of Texas at Dallas, Richardson, TX 75080, USA;5. Departamento de Física, Universidad de Sonora, Hermosillo, Sonora 83000, Mexico;1. Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. The Ningbo Branch of Ordnance Science Institute of China, Ningbo 315103, China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. National Institute for Space Research, São José dos Campos, São Paulo, Brazil;2. São Paulo Federal University, São José dos Campos, São Paulo, Brazil;3. Santa Cruz State University, Ilhéus, Bahia, Brazil;4. Federal University of Goiás, Goiânia, Goiás, Brazil |
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| Abstract: | Different Cr- and Ti-base films were deposited using PVD-arc deposition onto WC-Co substrates, and multilayered coatings were obtained from the superimposition of diamond coatings, deposited on the PVD interlayer using hot filament chemical vapour deposition (HFCVD). The behaviour of PVD-arc deposited CrN and CrC interlayers between diamond and WC-Co substrates was studied and compared to TiN, TiC, and Ti(C,N) interlayers. Tribological tests with alternative sliding motion were carried out to check the multilayer (PVD + diamond) film adhesion on WC-Co substrate. Multilayer films obtained using PVD arc, characterised by large surface droplets, demonstrated good wear resistance, while diamond deposited on smooth PVD TiN films was not adherent. Multilayered Ti(C,N) + diamond film samples generally showed poor wear resistance.Diamond adhesion on Cr-based PVD coatings deposited on WC-Co substrate was good. In particular, CrN interlayers improved diamond film properties and 6 μm-thick diamond films deposited on CrN showed excellent wear behaviour characterised by the absence of measurable wear volume after sling tests. Good diamond adhesion on Cr-based PVD films has been attributed to chromium carbide formation on PVD film surfaces during the CVD process. |
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