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Synthesis and Characterisation of Mo-B, Mo-B-C and Mo-Fe-B Thin Films Deposited by Magnetron Sputtering
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala University, 2017.
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-339415OAI: oai:DiVA.org:uu-339415DiVA, id: diva2:1175680
Opponent
Supervisors
Available from: 2018-01-22 Created: 2018-01-18 Last updated: 2018-01-22Bibliographically approved
List of papers
1. Synthesis and characterization of MoB2−x thin films grown by nonreactive DC magnetron sputtering
Open this publication in new window or tab >>Synthesis and characterization of MoB2−x thin films grown by nonreactive DC magnetron sputtering
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2016 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559Article in journal (Refereed) Published
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-335983 (URN)10.1116/1.4948234 (DOI)
Available from: 2017-12-11 Created: 2017-12-11 Last updated: 2018-01-18
2. Synthesis and characterisation of Mo-B-C thin films deposited by non-reactive DC magnetron sputtering
Open this publication in new window or tab >>Synthesis and characterisation of Mo-B-C thin films deposited by non-reactive DC magnetron sputtering
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 309, p. 506-515Article in journal (Refereed) Published
Abstract [en]

Thin films in the Mo-B-C system with varying carbon content (up to 37 at.%) were deposited using non-reactive DC magnetron sputtering. The phase composition and microstructure were determined and the potential use of the films in sliding electrical contact applications was evaluated. Films with lower than 23 at.% carbon content consisted of nanocrystalline MoB2 - x grains surrounded by an amorphous tissue phase (a-B for binary, and a-BCx for ternary films). With increasing carbon content grain sizes was found to decrease (from 16 to 5 nm), and above 23 at.% carbon the films deposited at room temperature were X-ray amorphous. Scanning transmission electron microscopy and energy dispersive X-ray spectroscopy reveal that these films contain Mo-rich and Mo-poor regions, and thus are two-phase amorphous nanocomposites. Low-carbon content samples exhibited a friction coefficient against the steel counter surface of 1.1; this was reduced to 0.8 for high carbon-content films. Analysis of the tribofilm revealed formation of molybdenum oxide and amorphous carbon, however without significant lubricating effect at room temperature. Hardness and elastic modulus decrease with carbon content from similar to 29 to similar to 22 GPa and similar to 526 to similar to 326 GPa. These values give an WE ratio of 0.06 to 0.07, indicating brittle material. Resistivity was found to increase with carbon content from similar to 175 mu Omega cm for binary Mo-B to similar to 395 mu Omega cm for Mo-B-C thin film with 37 at.% of C. Therefore all the above results suggest that the Mo-B-C films are not suitable for sliding electrical contacts.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2017
Keywords
Mo-B-C, Magnetron sputtering, Films, Hard coatings, Molybdenum diboride, Nanocomposite
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-319135 (URN)10.1016/j.surfcoat.2016.12.003 (DOI)000396184400059 ()
Funder
Swedish Research Council, 621-2012-4359 622-2008-405Knut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research , RMA11-0029
Available from: 2017-03-31 Created: 2017-03-31 Last updated: 2018-01-18Bibliographically approved
3. Synthesis and characterisation of nanocomposite Mo-Fe-B thin films deposited by magnetron sputtering
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(English)Manuscript (preprint) (Other academic)
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-336121 (URN)
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2018-01-18

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Malinovskis, Paulius

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