Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy

Hidenori Nishimura; Noritsugu Umehara; Hiroyuki Kousaka; Motoyuki Murashima

doi:10.1016/j.triboint.2016.10.029

Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy

Hidenori Nishimura, Noritsugu Umehara, Hiroyuki Kousaka, Motoyuki Murashima

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

In order to clarify a low friction mechanism of CNx (Carbon Nitride) coating in PAO (Poly Alpha Olefin) oil lubrication, we measured reflectance spectrum at friction area in-situ by reflectance spectroscopy. And we obtained thicknesses and polarizabilities of oil film and transformed layer formed on bulk CNx coating during friction test by analyzing reflectance spectrum. From results, we concluded that the increments of polarizabilities of transformed layer and oil film had an effect on increasing thickness of oil film, and then the lubricated condition changed from boundary to mixed lubrication. Finally CNx coating showed low friction coefficient in PAO oil lubrication.

Original language	English
Pages (from-to)	383-388
Number of pages	6
Journal	Tribology International
Volume	113
DOIs	https://doi.org/10.1016/j.triboint.2016.10.029
Publication status	Published - 2017
Externally published	Yes

Keywords

CNx coating
In-situ observation
Reflectance spectroscopy
Transformed layer

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1016/j.triboint.2016.10.029

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Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy. / Nishimura, Hidenori; Umehara, Noritsugu; Kousaka, Hiroyuki et al.
In: Tribology International, Vol. 113, 2017, p. 383-388.

Research output: Contribution to journal › Article › peer-review

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abstract = "In order to clarify a low friction mechanism of CNx (Carbon Nitride) coating in PAO (Poly Alpha Olefin) oil lubrication, we measured reflectance spectrum at friction area in-situ by reflectance spectroscopy. And we obtained thicknesses and polarizabilities of oil film and transformed layer formed on bulk CNx coating during friction test by analyzing reflectance spectrum. From results, we concluded that the increments of polarizabilities of transformed layer and oil film had an effect on increasing thickness of oil film, and then the lubricated condition changed from boundary to mixed lubrication. Finally CNx coating showed low friction coefficient in PAO oil lubrication.",

keywords = "CNx coating, In-situ observation, Reflectance spectroscopy, Transformed layer",

author = "Hidenori Nishimura and Noritsugu Umehara and Hiroyuki Kousaka and Motoyuki Murashima",

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year = "2017",

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AU - Nishimura, Hidenori

AU - Umehara, Noritsugu

AU - Kousaka, Hiroyuki

AU - Murashima, Motoyuki

PY - 2017

Y1 - 2017

N2 - In order to clarify a low friction mechanism of CNx (Carbon Nitride) coating in PAO (Poly Alpha Olefin) oil lubrication, we measured reflectance spectrum at friction area in-situ by reflectance spectroscopy. And we obtained thicknesses and polarizabilities of oil film and transformed layer formed on bulk CNx coating during friction test by analyzing reflectance spectrum. From results, we concluded that the increments of polarizabilities of transformed layer and oil film had an effect on increasing thickness of oil film, and then the lubricated condition changed from boundary to mixed lubrication. Finally CNx coating showed low friction coefficient in PAO oil lubrication.

AB - In order to clarify a low friction mechanism of CNx (Carbon Nitride) coating in PAO (Poly Alpha Olefin) oil lubrication, we measured reflectance spectrum at friction area in-situ by reflectance spectroscopy. And we obtained thicknesses and polarizabilities of oil film and transformed layer formed on bulk CNx coating during friction test by analyzing reflectance spectrum. From results, we concluded that the increments of polarizabilities of transformed layer and oil film had an effect on increasing thickness of oil film, and then the lubricated condition changed from boundary to mixed lubrication. Finally CNx coating showed low friction coefficient in PAO oil lubrication.

KW - CNx coating

KW - In-situ observation

KW - Reflectance spectroscopy

KW - Transformed layer

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Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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