Cr-diamondlike carbon nanocomposite films: Synthesis, characterization and properties

Singh, Varshni; Jiang, J. C.; Meletis, Efstathios I.

doi:10.1016/j.tsf.2005.04.104

Cited by 161 publications

(72 citation statements)

References 40 publications

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“…Similar observations were made on these films by x-ray diffraction and low angle x-ray diffraction experiments. 25 Further, as already reported, the bond lengths are nearly the same for all films and similar to that of Cr 3 C 2 powder ͑2.2 Å for Cr-C and 2.7 Å for Cr-Cr͒. Valence-band and core-level photoemission indicate that the precipitation of carbide nanoclusters preferentially occurs at the surface.…”

Section: Structuresupporting

confidence: 85%

Magnetism of Cr-doped diamond-like carbon

Santana

Skomski

Singh

et al. 2009

Journal of Applied Physics

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Chromium-doped hydrogenated diamond-like carbon ͑Cr-DLC͒ and chromium carbide hydrogenated DLC alloys were synthesized by plasma-assisted vapor deposition and investigated by x-ray absorption near edge structure spectroscopy, extended x-ray absorption fine structure, and superconducting quantum interference device ͑SQUID͒ magnetometry. Structural and magnetic properties of the doped and alloy materials were investigated as a function of the Cr concentration ͑0.1-20 at. %͒. Toward the upper end of the concentration range, Cr precipitates in the form of chromium carbide ͑Cr 3 C 2 ͒ nanoclusters. For low Cr concentrations, the systems are ferromagnetic at very low temperatures, whereas the chromium carbide clusters appear to be antiferromagnetic with uncompensated spins at the surface. Cr-DLC films and alloys with various Cr concentrations are used to make heterojunctions on silicon, and the produced diodes are investigated by I-V measurements. The heterojunctions exhibit negative magnetoresistance that saturates at less than 500 Oe and may be suitable for spin-electronics applications.

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Section: Structuresupporting

confidence: 85%

Magnetism of Cr-doped diamond-like carbon

Santana

Skomski

Singh

et al. 2009

Journal of Applied Physics

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“…The metal free a-C layer remains with a value under 0.1 during the complete 10000 cycle test. In the other stages, the progressive increase of CoF concomitantly with the sliding cycles can be associated with the increase of the actual contact area between the two counterfaces related to the gradual penetration of the counterbody into the film [16,41]. An increment in the CoF with the Cu content is observed (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of the metal concentration on the structural, mechanical and tribological properties of self-organized a-C:Cu hard nanocomposite coatings

Pardo

Buijnsters

Endrino

et al. 2013

Applied Surface Science

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174 GPa for the film with a Cu content of 28 at.%. In parallel, a 50% drop in the nanohardness from about 28 GPa towards 14 GPa is observed for these coatings. An increase in the Cu content also produces an increment of the coefficient of friction in reciprocating sliding tests performed against a corundum ball counterbody. As compared to the metal free film, a nearly four times higher coefficient of friction value is detected in the case of a Cu content of 28 at.%. Nevertheless, the carbon-copper composite coatings produced a clear surface protection of the substrate evidenced by a reduced wear loss for Cu contents below 5 at.%.

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“…Investigations into the tribological behavior of DLC film confirm that graphitization at the contact area of the ball and the film is the primary reason for low friction. [28,29] The SEM images of the wear scars clearly show a graphitic transferred layer. Moreover, the lower friction coefficient of the (Ti,Ce)/a-C:H film could be a result of the Ce co-doping.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film on WC cemented carbide substrate

2017

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WC cemented carbide suffers severe wear in water environments. A novel carbon-based film could be a feasible way to overcome this drawback. In this study, a rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film is successfully prepared on WC cemented carbide using a DC reactive magnetron sputtering process. The microstructure, mechanical properties, and tribological behavior of the as-prepared carbon-based film are systematically investigated. The results show that the doping Ti forms TiC nanocrystallites that are uniformly dispersed in the amorphous carbon matrix, whereas the doping Ce forms CeO2 that exists with the amorphous phase in the co-doped (Ti,Ce)/a-C:H carbon-based film. The mechanical properties of this (Ti,Ce)/a-C:H film exhibit remarkable improvements, which could suggest higher hardness and elastic modulus as well as better adhesive strength compared to solitary Ti-doped Ti/a-C:H film. In particular, the as-prepared (Ti,Ce)/a-C:H film presents a relatively low friction coefficient and wear rate in both ambient air and deionized water, indicating that (Ti,Ce)/a-C:H film could feasibly improve the tribological performance of WC cemented carbide in a water environment.

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Cr-diamondlike carbon nanocomposite films: Synthesis, characterization and properties

Cited by 161 publications

References 40 publications

Magnetism of Cr-doped diamond-like carbon

Magnetism of Cr-doped diamond-like carbon

Effect of the metal concentration on the structural, mechanical and tribological properties of self-organized a-C:Cu hard nanocomposite coatings

Rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film on WC cemented carbide substrate

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