Abstract
In this study a novel approach for the deposition of diamond-like carbon coating incorporated with molybdenum nanoparticles (DLC-Mo) thin film on tappet valve (metallic substrate) by incorporating MoO3 nanoparticles into DLC using pulsed-DC plasma enhanced chemical vapour deposition (PECVD) was successfully achieved. The as-deposited DLC-Mo was further characterized using scanning electron microscope/energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD), Raman spectroscopy, scratch test, Rockwell C indention test and nano-hardness measurement. The thickness was found to be 899.7 ± 16 nm. Hardness and elastic modulus 18.72 ± 0.1 and 150.03 ± 1.1 GPa respectively. The ID/IG was 0.98, D and G peaks positioned at 1350.92 and 1569.26 cm−1 respectively and Mo2C was observed from the XRD. The adhesion properties from the scratch and Rockwell C test were excellent, with low COF.
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