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Abstract
With a titanium interlayer, adherent diamond coating on copper is obtained. The diamond nucleation density is enhanced significantly by scratching the substrate with diamond powder and is influenced by the deposition conditions. It is found that the diamond growth rate increases with microwave power, gas pressure and methane concentration. However, a higher methane concentration results in increased growth defects and non-diamond phases. Under typical deposition conditions, the diamond crystals exhibit a (111) face dominating. The coating adhesion is accessed by pull-off tests and scratch tests. The former indicates that the coating adhesion is better than the strength of the adhesive, at ca 13 MPa. The latter shows a critical load about 8 N.
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