Effects of Applied Heat and Stress on Structural Changes of DLC Film

Diamond-like carbon (DLC) is considered to be predominantly amorphous, whereby small clusters of microcrystalline structures with sp3 and sp2 bonding, and an amorphous matrix, coexist. DLC film has some extraordinary properties such as high hardness, low friction, and high wear resistance. There is...

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Autores principales:	Yuuki Tokuta, Masahiro Kawaguchi, Aya Shimizu, Shinya Sasaki
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2012
Materias:	dlc hydrogen coating heat treatment raman spectroscopy erda Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/a5989d3441dc40a785298fd601e99914
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spelling	oai:doaj.org-article:a5989d3441dc40a785298fd601e999142021-11-05T09:24:57ZEffects of Applied Heat and Stress on Structural Changes of DLC Film1881-219810.2474/trol.7.119https://doaj.org/article/a5989d3441dc40a785298fd601e999142012-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/3/7_119/_pdf/-char/enhttps://doaj.org/toc/1881-2198Diamond-like carbon (DLC) is considered to be predominantly amorphous, whereby small clusters of microcrystalline structures with sp3 and sp2 bonding, and an amorphous matrix, coexist. DLC film has some extraordinary properties such as high hardness, low friction, and high wear resistance. There is strong demand for the use of such DLC properties in a wide range of tribological applications, including cutting tools, mechanical elements of automobiles, die surfaces, and computer hard disks. On the other hand, it is widely known that changes in the structure of DLC film during sliding affect its tribological properties. However, the precise mechanism of the structural change remains unclear. In this study, the effects of applied heat and stress on the structural changes of DLC films were investigated to evaluate the predominant factor in this mechanism. DLC film was deposited on a steel substrate using plasma-based ion implantation and deposition. After heat treatment with applied force, structural changes of the DLC film were investigated by micro-laser Raman spectroscopy. Structural change was confirmed in DLC film annealed at temperatures over 648 K. This suggests that hydrogen evolution from the DLC film possibly caused the structural change. Greater hydrogen evolution was observed from the unloaded surface compared to the loaded area. Structural change was found to be dependent on the stress field: The tensile stress led to structural change, but the compressive stress field did not affect the structural change. These results indicate that a structural change in DLC film caused by heat treatment can be suppressed by preventing hydrogen evolution from the surface of the film.Yuuki TokutaMasahiro KawaguchiAya ShimizuShinya SasakiJapanese Society of Tribologistsarticledlc hydrogencoatingheat treatmentraman spectroscopyerdaPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 3, Pp 119-126 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	dlc hydrogen coating heat treatment raman spectroscopy erda Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	dlc hydrogen coating heat treatment raman spectroscopy erda Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yuuki Tokuta Masahiro Kawaguchi Aya Shimizu Shinya Sasaki Effects of Applied Heat and Stress on Structural Changes of DLC Film
description	Diamond-like carbon (DLC) is considered to be predominantly amorphous, whereby small clusters of microcrystalline structures with sp3 and sp2 bonding, and an amorphous matrix, coexist. DLC film has some extraordinary properties such as high hardness, low friction, and high wear resistance. There is strong demand for the use of such DLC properties in a wide range of tribological applications, including cutting tools, mechanical elements of automobiles, die surfaces, and computer hard disks. On the other hand, it is widely known that changes in the structure of DLC film during sliding affect its tribological properties. However, the precise mechanism of the structural change remains unclear. In this study, the effects of applied heat and stress on the structural changes of DLC films were investigated to evaluate the predominant factor in this mechanism. DLC film was deposited on a steel substrate using plasma-based ion implantation and deposition. After heat treatment with applied force, structural changes of the DLC film were investigated by micro-laser Raman spectroscopy. Structural change was confirmed in DLC film annealed at temperatures over 648 K. This suggests that hydrogen evolution from the DLC film possibly caused the structural change. Greater hydrogen evolution was observed from the unloaded surface compared to the loaded area. Structural change was found to be dependent on the stress field: The tensile stress led to structural change, but the compressive stress field did not affect the structural change. These results indicate that a structural change in DLC film caused by heat treatment can be suppressed by preventing hydrogen evolution from the surface of the film.
format	article
author	Yuuki Tokuta Masahiro Kawaguchi Aya Shimizu Shinya Sasaki
author_facet	Yuuki Tokuta Masahiro Kawaguchi Aya Shimizu Shinya Sasaki
author_sort	Yuuki Tokuta
title	Effects of Applied Heat and Stress on Structural Changes of DLC Film
title_short	Effects of Applied Heat and Stress on Structural Changes of DLC Film
title_full	Effects of Applied Heat and Stress on Structural Changes of DLC Film
title_fullStr	Effects of Applied Heat and Stress on Structural Changes of DLC Film
title_full_unstemmed	Effects of Applied Heat and Stress on Structural Changes of DLC Film
title_sort	effects of applied heat and stress on structural changes of dlc film
publisher	Japanese Society of Tribologists
publishDate	2012
url	https://doaj.org/article/a5989d3441dc40a785298fd601e99914
work_keys_str_mv	AT yuukitokuta effectsofappliedheatandstressonstructuralchangesofdlcfilm AT masahirokawaguchi effectsofappliedheatandstressonstructuralchangesofdlcfilm AT ayashimizu effectsofappliedheatandstressonstructuralchangesofdlcfilm AT shinyasasaki effectsofappliedheatandstressonstructuralchangesofdlcfilm
_version_	1718444366318534656

Effects of Applied Heat and Stress on Structural Changes of DLC Film

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