Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering

M. D. Abad; M. A. Muñoz-Márquez; S. El Mrabet; A. Justo; J. C. Sánchez-López

doi:10.1016/j.surfcoat.2010.04.019

Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering

M. D. Abad, M. A. Muñoz-Márquez, S. El Mrabet, A. Justo, J. C. Sánchez-López^*

^*Corresponding author for this work

Research output: Indexed journal article › Article › peer-review

123 Citations (Scopus)

Abstract

Nanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W₂C to β-WC_1.x. Further C enrichment leads to a nanocomposite structure of small WC_1-x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36-40GPa; μ=0.6-0.8) to moderate-hard/low friction (16-20GPa; μ~0.2) coatings depending on the film composition. The transition point is found for a-C content of 10at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC_1-x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites.

Original language	English
Pages (from-to)	3490-3500
Number of pages	11
Journal	Surface and Coatings Technology
Volume	204
Issue number	21-22
DOIs	https://doi.org/10.1016/j.surfcoat.2010.04.019
Publication status	Published - Aug 2010
Externally published	Yes

Keywords

Amorphous carbon
Friction
Hardness
Magnetron sputtering
Nanocomposites
Tungsten carbide

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10.1016/j.surfcoat.2010.04.019

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title = "Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering",

abstract = "Nanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W2C to β-WC1.x. Further C enrichment leads to a nanocomposite structure of small WC1-x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36-40GPa; μ=0.6-0.8) to moderate-hard/low friction (16-20GPa; μ~0.2) coatings depending on the film composition. The transition point is found for a-C content of 10at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC1-x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites.",

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AU - Muñoz-Márquez, M. A.

AU - El Mrabet, S.

AU - Justo, A.

AU - Sánchez-López, J. C.

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N2 - Nanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W2C to β-WC1.x. Further C enrichment leads to a nanocomposite structure of small WC1-x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36-40GPa; μ=0.6-0.8) to moderate-hard/low friction (16-20GPa; μ~0.2) coatings depending on the film composition. The transition point is found for a-C content of 10at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC1-x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites.

AB - Nanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W2C to β-WC1.x. Further C enrichment leads to a nanocomposite structure of small WC1-x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36-40GPa; μ=0.6-0.8) to moderate-hard/low friction (16-20GPa; μ~0.2) coatings depending on the film composition. The transition point is found for a-C content of 10at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC1-x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites.

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Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering

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Keywords

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