Novel carbon-based nc-MoC/a-C(Al) nanocomposite coating towards low internal stress and low-friction

Novel carbon-based nc-MoC/a-C(Al) nanocomposite coating was fabricated by co-incorporation of metallic molybdenum and aluminum via multi-functional magnetron sputtering system. The composition and structure of as-fabricated coating were investigated by X-ray photoelectron spectrometer (XPS), X-ray d...

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Bibliographic Details
Published in:Surface & coatings technology 2014-03, Vol.242, p.177-182
Main Authors: Zhou, Shengguo, Chen, Hao, Ma, Liqiu
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Low-friction
Materials science
Metals. Metallurgy
Microstructure
Nanocomposite
nc-MoC/a-C(Al)
Physics
Production techniques
Surface treatment
Surface treatments
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Summary:Novel carbon-based nc-MoC/a-C(Al) nanocomposite coating was fabricated by co-incorporation of metallic molybdenum and aluminum via multi-functional magnetron sputtering system. The composition and structure of as-fabricated coating were investigated by X-ray photoelectron spectrometer (XPS), X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM). It confirmed that the nc-MoC/a-C(Al) coating is composed of 72.0at.% C, 17.3at.% Mo, 6.7at.% Al and 4.0at.% O, respectively, and it presents a typical nanocomposite microstructure where Mo carbide nanoparticles are uniformly dispersed in the a-C matrix. Nano-indenter, interferometer and ball-on-disk tribometer were carried out to evaluate the hardness, internal stress and tribological properties. The results showed that the carbon-based nc-MoC/a-C(Al) nanocomposite coating owns superior combined mechanical properties with relatively low internal stress and high hardness as well as strong adhesion strength. In particular, this novel carbon-based coating can achieve low-friction and anti-wear performances with a friction coefficient of 0.06 and wear rate of 2.1×10−16m3/N·m, indicating that it has a great potential in engineering applications. •The nc-MoC/a-C(Al) coating presents typical nanocrystallites/amorphous structure.•The nc-MoC/a-C(Al) coating possesses low internal stress and low-friction.•The nc-MoC/a-C(Al) coating easily forms a graphitized tribofilm on contact surface.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.01.041