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Hard and dense diamond like carbon coatings deposited by deep oscillations magnetron sputtering
Univ Coimbra, Dept Mech Engn, SEG CEMUC, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0003-2679-2387
Univ Coimbra, Dept Mech Engn, SEG CEMUC, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal.;Inst Pedro Nunes, LED&Mat IPN, Lab Ensaios Desgaste & Mat, Rua Pedro Nunes, P-3030199 Coimbra, Portugal..
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2018 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 336, p. 92-98Article in journal (Refereed) Published
Abstract [en]

Recent developments in the automotive industry to improve engine efficiency and minimize pollutant emissions are driving the need for higher operating temperatures and loading densities in internal combustion engines. Future engines for internal combustion engines will require coatings with increased temperature stability (up to 500 degrees C) and wear resistance as compared to present day solutions. Hard tetrahedral DLC coatings (ta-C coatings) very low coefficient of friction and performed very well under mixed and boundary lubrication, and, thus, they are very attractive for automotive industry. In this work, DLC coatings were deposited by deep oscillations magnetron sputtering (DOMS), a variant of high power magnetron sputtering (HiPIMS). The main objective is to increase the sp(3) content in the films, as compared to d.c. magnetron sputtering (DCMS), and thus extend their operating range to higher temperatures. Increasing the bias voltage results in denser and smoother films with increasing hardness, as measured by nano-indentation, and increasing mass density, as measured by x-ray reflectivity. Accordingly, the UV Raman spectroscopy analysis of the films shows that the sp(3)/sp(2) ratio in the films increases with increasing substrate biasing. However, the sp(3) bonds convert back to sp(2) upon annealing. Never the less, a significantly higher amount of sp(3) bonds is formed in the DLC films deposited by DOMS, as compared to the DCMS ones, showing that DOMS is a promising path for the development of hard DLC films.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 336, p. 92-98
Keywords [en]
DLC, DOMS, Mass density, Hardness, Temperature stability
National Category
Materials Chemistry Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-348847DOI: 10.1016/j.surfcoat.2017.10.055ISI: 000425478000015OAI: oai:DiVA.org:uu-348847DiVA, id: diva2:1199466
Conference
60th Annual Technical Conference of the Society-of-Vacuum-Coaters (SVC), APR 29-MAY 04, 2017, Providence, RI
Available from: 2018-04-20 Created: 2018-04-20 Last updated: 2018-05-02Bibliographically approved

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Aijaz, AsimKubart, Tomas

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