Substrate and material transfer effects on the surface chemistry and texture of diamond‐like carbon deposited by plasma‐enhanced chemical vapour deposition

Abstract

transfer effects on the surface chemistry and texture of diamond-like carbon deposited by plasma enhanced CVD Surface and Interface Analysis 44 (2012) AbstractDiamond-like carbon (DLC), a thin amorphous carbon film, has many uses in tribological systems. Exploiting alternative substrates and interlayers can enable control of the hardness and modulus of the multi-layer system and improve wear or friction properties. We utilise XPS and AFM to examine DLC concurrently coated on an epoxy interlayer and a steel substrate by plasma enhanced chemical vapour deposition (PECVD). sp 2 /sp 3 ratios were calculated both by deconvolution of the XPS C1s line and analysis of the C KLL Auger spectrum. Altering the substrate causes changes in the carbon bonding configuration, evident with the same trend through both analysis methods, though with differing absolute values, related to hydrogen and oxygen content. There is significant variation in the microscale surface texture, exhibited both by average roughness values and size and uniformity of surface asperities. This suggests that alteration to the film surface structure is a factor to be considered in addition to interface adhesion, hardness and elastic modulus, in investigating substrates and interlayers for tribological coatings. Examination of a DLC film separately produced on a steel substrate, in comparison with that produced concurrently with DLC coating of epoxy, shows the possibility of effects on the chemistry of the film through transfer of material from adjacent samples within the plasma deposition, related to heating, out-gassing or sputtering processes. The possibility of such contamination has implications in coating parameter design and coating of multiple samples with PECVD.

Recycling of DLC-Coated Tools for Dry Machining of Aluminum Alloys via Oxygen Plasma Ashing

“…DLC (Diamond-Like Carbon) coating is high-lighted as a promising method to prolong the tool life in practice. As had been reported in Jones (2012) and Zolgharni, Jones, Bulpett, Anson, and Franks (2008), adhesion of aluminum alloys to cutting tools was significantly reduced by DLC coating. In case of bare tools, the wrought aluminum alloy was easy to glue into teeth of tools even at the beginning stage of machining.…”

Ultrathin undoped tetrahedral amorphous carbon films: The role of the underlying titanium layer on the electronic structure

“…Raman spectroscopy was performed in order to check whether the ta-C bonding structure was identical for samples with different underlying Ti layers, because substrate nature and roughness may affect the ta-C quality [33,34]. Raman spectra, their fitting and the I(D)/I(G) ratio values are presented in Figure 1.…”

“…Only samples that were thicker than 60-70 nm maintain properties of bulk ta-C (Young's modulus, density, sp 3 fraction) [31,32]. In addition, the quality of the substrate/ta-C interface may affect the properties of the top ta-C layer [33,34].…”

Avaliação Da Adesão De Filmes Multifuncionais: Comparação Entre Testes De Indentação E Riscamento

“…A incorporação de fortes formadores de carbonetos, como o silício, nas interfaces onde se deseja aplicar DLC tem um efeito benéfico na adesividade destes filmes, uma vez que a componente de ligação química entre revestimento e substrato é aprimorada desta maneira [5]. Outra forma de se melhorar a adesividade destes filmes é através do ataque da superfície por bombardeamento iônico com argônio [6,7]. Este tratamento aumenta a rugosidade do substrato levando a um aumento da componente mecânica de ligação [6,8].…”

“…Outra forma de se melhorar a adesividade destes filmes é através do ataque da superfície por bombardeamento iônico com argônio [6,7]. Este tratamento aumenta a rugosidade do substrato levando a um aumento da componente mecânica de ligação [6,8]. Morshed [9] sugere que ao otimizar as condições de ataque iônico com argônio é possível maximizar a adesividade e minimizar tensões residuais, sem alterar de forma significativa a dureza destes filmes.…”