Low Friction Property of Boron Doped DLC under Engine Oil

DLC films are of significant interest for automobile parts, because they possess the potential to improve the friction property under oil lubricated conditions. In order to obtain further low friction, we focused on the combination of boron doped DLC (B-DLC) and the Mo-trimer as a lubricating oil ad...

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Autores principales:	Hiroyuki Mori, Mamoru Tohyama, Masaru Okuyama, Toshihide Ohmori, Naoya Ikeda, Keiji Hayashi
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2017
Materias:	dlc boron low friction engine oil additive mo-trimer 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/4cc7af21cab44a089ebd92d0ec8e1028
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spelling	oai:doaj.org-article:4cc7af21cab44a089ebd92d0ec8e10282021-11-05T09:20:26ZLow Friction Property of Boron Doped DLC under Engine Oil1881-219810.2474/trol.12.135https://doaj.org/article/4cc7af21cab44a089ebd92d0ec8e10282017-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/12/3/12_135/_pdf/-char/enhttps://doaj.org/toc/1881-2198DLC films are of significant interest for automobile parts, because they possess the potential to improve the friction property under oil lubricated conditions. In order to obtain further low friction, we focused on the combination of boron doped DLC (B-DLC) and the Mo-trimer as a lubricating oil additive, and the influence of the boron concentration on the friction property of the B-DLC films was evaluated by a block on ring type test. Compared to DLC films without boron, the B-DLC films exhibited an extremely low friction coefficient below 0.03 ranging from 2 to 12 at% in boron concentration under the lubricating condition using the engine oil containing the Mo-trimer. It was found that the surface roughness of the B-DLC films rubbed in the oil containing the Mo-trimer became particularly smooth below 2 nm measured by an atomic force microscope. On the wear surface of the B-DLC films, Mo3S7- derived from the Mo-trimer was selectively confirmed as having a uniform distribution by time-of-flight secondary ion mass spectrometry. Based on the obtained results of surface measurements and analyses, it was suggested that the B-DLC films exhibited a low friction property primarily caused by the nano-scale smooth surface, disturbing the adsorption of the other additives and the transfer reaction products from the counter parts by forming a selective adsorbed Mo-trimer film on the B-DLC surface.Hiroyuki MoriMamoru TohyamaMasaru OkuyamaToshihide OhmoriNaoya IkedaKeiji HayashiJapanese Society of Tribologistsarticledlcboronlow frictionengine oiladditivemo-trimerPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 12, Iss 3, Pp 135-140 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	dlc boron low friction engine oil additive mo-trimer Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	dlc boron low friction engine oil additive mo-trimer Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Hiroyuki Mori Mamoru Tohyama Masaru Okuyama Toshihide Ohmori Naoya Ikeda Keiji Hayashi Low Friction Property of Boron Doped DLC under Engine Oil
description	DLC films are of significant interest for automobile parts, because they possess the potential to improve the friction property under oil lubricated conditions. In order to obtain further low friction, we focused on the combination of boron doped DLC (B-DLC) and the Mo-trimer as a lubricating oil additive, and the influence of the boron concentration on the friction property of the B-DLC films was evaluated by a block on ring type test. Compared to DLC films without boron, the B-DLC films exhibited an extremely low friction coefficient below 0.03 ranging from 2 to 12 at% in boron concentration under the lubricating condition using the engine oil containing the Mo-trimer. It was found that the surface roughness of the B-DLC films rubbed in the oil containing the Mo-trimer became particularly smooth below 2 nm measured by an atomic force microscope. On the wear surface of the B-DLC films, Mo3S7- derived from the Mo-trimer was selectively confirmed as having a uniform distribution by time-of-flight secondary ion mass spectrometry. Based on the obtained results of surface measurements and analyses, it was suggested that the B-DLC films exhibited a low friction property primarily caused by the nano-scale smooth surface, disturbing the adsorption of the other additives and the transfer reaction products from the counter parts by forming a selective adsorbed Mo-trimer film on the B-DLC surface.
format	article
author	Hiroyuki Mori Mamoru Tohyama Masaru Okuyama Toshihide Ohmori Naoya Ikeda Keiji Hayashi
author_facet	Hiroyuki Mori Mamoru Tohyama Masaru Okuyama Toshihide Ohmori Naoya Ikeda Keiji Hayashi
author_sort	Hiroyuki Mori
title	Low Friction Property of Boron Doped DLC under Engine Oil
title_short	Low Friction Property of Boron Doped DLC under Engine Oil
title_full	Low Friction Property of Boron Doped DLC under Engine Oil
title_fullStr	Low Friction Property of Boron Doped DLC under Engine Oil
title_full_unstemmed	Low Friction Property of Boron Doped DLC under Engine Oil
title_sort	low friction property of boron doped dlc under engine oil
publisher	Japanese Society of Tribologists
publishDate	2017
url	https://doaj.org/article/4cc7af21cab44a089ebd92d0ec8e1028
work_keys_str_mv	AT hiroyukimori lowfrictionpropertyofborondopeddlcunderengineoil AT mamorutohyama lowfrictionpropertyofborondopeddlcunderengineoil AT masaruokuyama lowfrictionpropertyofborondopeddlcunderengineoil AT toshihideohmori lowfrictionpropertyofborondopeddlcunderengineoil AT naoyaikeda lowfrictionpropertyofborondopeddlcunderengineoil AT keijihayashi lowfrictionpropertyofborondopeddlcunderengineoil
_version_	1718444407969021952

Low Friction Property of Boron Doped DLC under Engine Oil

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