Production and wetting properties of fluorinated diamond-like carbon coatings

Butter, R.; Waterman, D R; Lettington, Alan H.; Ramos, Rogerio T.; Fordham, E.J.

doi:10.1016/s0040-6090(97)00337-4

Cited by 118 publications

(46 citation statements)

References 26 publications

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“…This in itself is not unusual due to the extent that doping with these elements must affect the microstructure and reactivity of the coating. Inclusion of F within DLC films has been shown to change surface wettability, the amount of C-C bonding in DLC films and also decreases intrinsic film stress of the film (26)(27)(28). Fluorine has also been shown to reduce the hardness of DLC films (29).…”

Section: Discussionmentioning

confidence: 99%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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Diamond-like Carbon coatings are well-known for their excellent wear and friction reducing properties. Novel DLCs are constantly being developed that further these beneficial characteristics; this is often achieved by incorporating a dopant into the microstructure of the DLC. One dopant that is widely used currently in commercial settings, including F1 car engines, is silicon. Si doping can be, to some extent, regarded as a double-edged sword. This is because, whilst it has been reported as being able to reduce friction in certain environments, this usually comes at the cost of far higher wear than the corresponding un-doped DLC. The fundamental aspects of Si-DLC's friction and wear properties are explored herein with the goal of optimising the coating using fundamental tribochemical knowledge.

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Section: Discussionmentioning

confidence: 99%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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“…In the case of the CHxFy film, it is difficult to generate the proton acceptor in the film because the fluorine atom (F) has a higher electronegatively than the carbon atom (C) and the CFx connection to the film is stable (Butter et al 1997;Prioli et al 2003). Therefore, the increase in the bonded fraction will be caused by the change in the number of dangling bonds induced by doping F into the film (Lim et al 2006), i.e., it will be based on the increase in the doping F, at first, the CF and CF 2 portions increase (C=C portions remain), then the CF and CF 2 portions decrease and the CF 3 portions increase (C=C portions decrease).…”

Section: Methodsmentioning

confidence: 99%

“…Comparison of the effects between the vapor deposition technique and dip-coating process will be discussed. In this study, the incorporation of nitrogen and fluorine contents into the DLC film is investigated in order to change the characteristics of the DLC surface (Yu et al 2003;Xin et al 2002;Cicala et al 2004;Kato et al 2003;Trippe et al 2004;Kawaguchi et al 2006;Choi et al 2006;Butter et al 1997;Prioli et al 2003;Leezeberg et al 2001;Stirniman and Falcone 2000). The PFPE lubricant molecules are deposited on the hydrogen, nitrogen or fluorine doped DLC surface using the vapor deposition technique.…”

Section: Introductionmentioning

confidence: 99%

Vacuum vapor deposition of PFPE molecules on CHxNy and CHxFy amorphous carbon surfaces

2007

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According to the demand of increasing storage density for the magnetic data storage, a contact recording system is proposed, in which the head constantly makes contact with the disk surface during read/write cycles. In this system a stronger lubricant film for head disk interface (HDI) is required. In a conventional dip-coating method, which is carried out under atmospheric conditions, however, a fresh diamond like carbon (DLC) surface adsorbs several contaminations from the air and a strong lubricant layer is difficult to form on the DLC surface. In this study, a DLC layer is coated on a Si substrate by a plasma chemical vapor deposition (PCVD) method, then the DLCcoated Si sample is transferred to another vacuum chamber without being exposed to the atmosphere, and a perfluoropolyether (PFPE) lubricant film is vapor-deposited on the sample. The sample is analyzed by XPS and compared to the surface on which the PFPE lubricant is dip-coated. It is noted that both samples are rinsed after the coatings and the loose PFPE molecules are washed away. A thicker bonded layer of PFPE is formed on the DLC surface treated by vapor deposition. A tribological wear test is also carried out using a pin-on-disk tribotester. Both results show that the tribological characteristics are improved by the vapor deposition of PFPE molecules compared to the dip-coating method.

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“…O mecanismo de fluoração nos filmes de a-C:H promove a substituição dos átomos de hidrogênio pelos átomos de flúor na rede estrutural desse material (BUTTER et al, 1997). Esse fenômeno foi evidenciado através das análises de espectroscopia Raman e XPS nos filmes de a-C:H fluorados, que revelou a ocorrência de um aumento na intensidade da banda C-F e uma diminuição na intensidade da banda C-H nos espectros desse material (SAH, 1985).…”

Section: Processos De Incorporação De Flúor Nos Filmes A-c:hunclassified

“…Alguns autores mostram que o mecanismo de fluoração dos filmes de a-C:H ocorre pela substituição dos átomos de hidrogênio por átomos de flúor na rede estrutural desse material (BUTTER et al, 1997;SAH, 1985). Os espectros de alta resolução do pico C 1s foram adquiridos e ajustados com cinco Gaussianas.…”

Section: Potência (W)unclassified

Efeito da incorporação de flúor nas propriedades de superfície de filmes DE aC:H

Marins¹

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"Os pequenos atos que se executam são melhores que todos aqueles grandes que se planejam." George C. Marshal AGRADECIMENTOSEm primeiro lugar agradeço a Deus, pois sem Ele nada seria possível.Aos meus filhos André Luiz e Vanessa, pela compreensão, paciência e que apesar das dificuldades, sempre incentivaram meus estudos.À minha orientadora, Prof a . Drª. Elidiane Cipriano Rangel pelas valiosas discussões, paciência e confiança, para a realização deste trabalho.Ao Prof. Dr. Rogério Pinto Mota que jamais deixou de me incentivar. Sem a sua Coorientação, dedicação e auxílio, o estudo aqui apresentado seria praticamente impossível.Ao Prof. Dr. Roberto Yzumi Honda, pela amizade, pelo carinho e contribuição nos trabalhos experimentais, sem a qual seria difícil concluí-lo.Ao Sr. José Benedito Galhardo pela pronta ajuda com os equipamentos do laboratório. RESUMO Filmes finos de carbono amorfo hidrogenado (a-C:H) e fluorados (a-C:H:F)foram depositados a partir de plasmas de misturas de acetileno/argônio e acetileno/argônio/hexafluoreto de enxofre. Para a primeira mistura de gases, o plasma foi mantido por 5 e 10 minutos a uma pressão de 9,5 Pa (30% C 2 H 2 e 70% Ar) enquanto para a segunda ele foi mantido por 5 minutos utilizando-se 30% C 2 H 2 , 65%Ar e 5% SF 6 a uma pressão total de 9,5 Pa. A potência do sinal de excitação foi variada ABSTRACTHydrogenated amorphous carbon (a-C:H) and fluorinated (a-C:H:F) thin films were deposited from acetylene/argon and acetylene/argon/sulfur hexafluoride mixtures. For the first gas mixture, the plasma was kept for 5 or 10 minutes using 9.5 Pa of pressure (30% C 2 H 2 e 70% Ar) while for the second it was kept for 5 minutes using 30% C 2 H 2 , 65% Ar e 5% SF 6 at a total pressure of 9.5 Pa. The power of the excitation signal was changed from 5 to 125 W and the effect of such parameter on the properties of the films was investigated. To fluorinate the a-C:H films they were submitted, immediately after deposition and without exposure to atmosphere, to SF 6 plasma treatments. Such procedures were conducted for 5 minutes in radiofrequency (13.56MHz, 70 W) plasmas of 13.3 Pa of pressure. Raman and X-Ray photoelectron spectroscopes were employed to investigate, respectively, the microstructure and chemical composition of the films. Film hardness and friction coefficient were determined from nanoindentation and tribometry techniques, respectively. The receptivity of the samples towards water was evaluated through contact angle data and roughness was measured by optical interferometry. The a-C:H films obtained from the C 2 H 2 and Ar plasma mixtures in lower power (5 e 25 W) presented polymer-like structures and compositions while those prepared using intermediary power levels ( 50 e 75 W) presented higher proportions of tetrahedral carbon bonds and low proportions of hydrogen, suggesting a Diamond like Carbon (DLC) structure. Films deposited using the higher power (100 e 125 W) plasmas presented a graphitic structure. As the material prepared with lower power signals were submitted to the S...

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Production and wetting properties of fluorinated diamond-like carbon coatings

Cited by 118 publications

References 26 publications

Repressing oxidative wear within Si doped DLCs

Repressing oxidative wear within Si doped DLCs

Vacuum vapor deposition of PFPE molecules on CHxNy and CHxFy amorphous carbon surfaces

Efeito da incorporação de flúor nas propriedades de superfície de filmes DE aC:H

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