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Hard and dense diam...
Hard and dense diamond like carbon coatings deposited by deep oscillations magnetron sputtering
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- Ferreira, Fabio (författare)
- Univ Coimbra, Dept Mech Engn, SEG CEMUC, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal.
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- Aijaz, Asim (författare)
- Uppsala universitet,Fasta tillståndets elektronik
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- Kubart, Tomas, 1977- (författare)
- Uppsala universitet,Fasta tillståndets elektronik
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- Cavaleiro, Albano (författare)
- 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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- Oliveira, Joao (författare)
- Univ Coimbra, Dept Mech Engn, SEG CEMUC, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal.
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Univ Coimbra, Dept Mech Engn, SEG CEMUC, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal Fasta tillståndets elektronik (creator_code:org_t)
- ELSEVIER SCIENCE SA, 2018
- 2018
- Engelska.
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Ingår i: Surface & Coatings Technology. - : ELSEVIER SCIENCE SA. - 0257-8972 .- 1879-3347. ; 336, s. 92-98
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- DLC
- DOMS
- Mass density
- Hardness
- Temperature stability
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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