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Physical Properties of Diamond Coatings on a WC-6%Co Substrate |
| LIU Sha;YI Dan-Qing;YU Zhi-Ming |
| Department of Materials Science & Engineering, Central South
University, Changsha 410083
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| Cite this article: |
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LIU Sha, YI Dan-Qing, YU Zhi-Ming 2002 Chin. Phys. Lett. 19 422-424 |
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Abstract We have investigated the physical properties, including the morphology, texture, adhesion and chemical quality, of high-frequency chemical vapour deposited diamond coatings on WC-6%Co substrates which were pre-treated by a two-step etching method. The results indicate that the increasing Co content from 0.12 to 3.05% within the etching depth of 5μm caused a morphology transformation from prism diamond to spherulitic diamond, and a texture one from a {111} orientation to a {110} orientation. The Raman spectrum shows that the spherulitic diamond film contains more non-diamond phases (graphite, amorphous carbon and diamond-like carbon, etc) and has lower chemical quality of diamond films on a WC-6%Co substrate. The diamond coating grain sizes became smaller about 4 times when the deposition temperatures on the substrate surface were reduced from 1000 to 900°C. Compared with spherulitic diamond films, the prism diamond films exhibit better adhesion on the WC-6%Co substrate.
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| Keywords:
81.15.Gh
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Published: 01 March 2002
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| PACS: |
81.15.Gh
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(Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.))
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