The effect of coating properties on the performance of a-C:H and ta-C films

Helena Ronkainen, Kenneth Holmberg, Anssi Laukkanen, Tom Andersson, M. Kano, T. Horiuchi, T. Suzuki

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

DLC films cover a wide range of different carbon based coatings, starting from soft to extremely hard diamond-like carbon films. In this study two different types of DLC films have been studied in respect of their stress and strain characteristics and tribological performance. The coatings are hydrogenated amorphous carbon (a-C:H) coatings deposited by PECVD and tetrahedral amorphous carbon (ta-C) coating deposited by filtered arc technique. In order to evaluate the mechanical behaviour of the coatings under load, 3D FE modelling was carried out in combination with scratch testing. Also the tribological performance was evaluated with pin-on-disc tests using stepwise increasing normal load. The 3D FEM model was developed for calculating the stress and strain distributions of DLC coated systems and to evaluate how coating thickness and elastic properties affect the stress-strain state at crack initiation location. The simulation was compared to the findings to experimental observations in scratch test contact conditions, when the spherical diamond tip was moving with increased load on a coated surface. The coating performance was evaluated with scratch testing to detect the crack generation as well as the coating adhesion. When combining the simulated coating characteristics with empirical observation of coating fracture patterns the coating fracture performance and tolerance to cracking could be evaluated. A major effect of the coating elastic modulus on the stress and fracture behaviour of the coatings was observed. In the tribological testing the both coatings had a low friction performance. In the tribological testing with stepwise increasing load, the critical load for coating delamination was higher for the a-C:H coating, which is in accordance with the results of FE modelling of coating stress state.
Original languageEnglish
Pages (from-to)3-10
Number of pages8
JournalTribologia
Volume31
Issue number3-4
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Carbon films
Amorphous carbon
Amorphous films
coatings
Coatings
carbon
Testing
diamonds
Diamond like carbon films
Diamond
strain distribution
crack initiation
Plasma enhanced chemical vapor deposition
Crack initiation
Delamination

Keywords

  • A-C:H
  • DLC
  • modelling
  • Ta-C
  • tribology
  • ProperTune

Cite this

Ronkainen, Helena ; Holmberg, Kenneth ; Laukkanen, Anssi ; Andersson, Tom ; Kano, M. ; Horiuchi, T. ; Suzuki, T. / The effect of coating properties on the performance of a-C:H and ta-C films. In: Tribologia. 2012 ; Vol. 31, No. 3-4. pp. 3-10.
@article{7ddd10f06564477ab7cf06fc468ee6fd,
title = "The effect of coating properties on the performance of a-C:H and ta-C films",
abstract = "DLC films cover a wide range of different carbon based coatings, starting from soft to extremely hard diamond-like carbon films. In this study two different types of DLC films have been studied in respect of their stress and strain characteristics and tribological performance. The coatings are hydrogenated amorphous carbon (a-C:H) coatings deposited by PECVD and tetrahedral amorphous carbon (ta-C) coating deposited by filtered arc technique. In order to evaluate the mechanical behaviour of the coatings under load, 3D FE modelling was carried out in combination with scratch testing. Also the tribological performance was evaluated with pin-on-disc tests using stepwise increasing normal load. The 3D FEM model was developed for calculating the stress and strain distributions of DLC coated systems and to evaluate how coating thickness and elastic properties affect the stress-strain state at crack initiation location. The simulation was compared to the findings to experimental observations in scratch test contact conditions, when the spherical diamond tip was moving with increased load on a coated surface. The coating performance was evaluated with scratch testing to detect the crack generation as well as the coating adhesion. When combining the simulated coating characteristics with empirical observation of coating fracture patterns the coating fracture performance and tolerance to cracking could be evaluated. A major effect of the coating elastic modulus on the stress and fracture behaviour of the coatings was observed. In the tribological testing the both coatings had a low friction performance. In the tribological testing with stepwise increasing load, the critical load for coating delamination was higher for the a-C:H coating, which is in accordance with the results of FE modelling of coating stress state.",
keywords = "A-C:H, DLC, modelling, Ta-C, tribology, ProperTune",
author = "Helena Ronkainen and Kenneth Holmberg and Anssi Laukkanen and Tom Andersson and M. Kano and T. Horiuchi and T. Suzuki",
year = "2012",
language = "English",
volume = "31",
pages = "3--10",
journal = "Tribologia",
issn = "0780-2285",
number = "3-4",

}

Ronkainen, H, Holmberg, K, Laukkanen, A, Andersson, T, Kano, M, Horiuchi, T & Suzuki, T 2012, 'The effect of coating properties on the performance of a-C:H and ta-C films', Tribologia, vol. 31, no. 3-4, pp. 3-10.

The effect of coating properties on the performance of a-C:H and ta-C films. / Ronkainen, Helena; Holmberg, Kenneth; Laukkanen, Anssi; Andersson, Tom; Kano, M.; Horiuchi, T.; Suzuki, T.

In: Tribologia, Vol. 31, No. 3-4, 2012, p. 3-10.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of coating properties on the performance of a-C:H and ta-C films

AU - Ronkainen, Helena

AU - Holmberg, Kenneth

AU - Laukkanen, Anssi

AU - Andersson, Tom

AU - Kano, M.

AU - Horiuchi, T.

AU - Suzuki, T.

PY - 2012

Y1 - 2012

N2 - DLC films cover a wide range of different carbon based coatings, starting from soft to extremely hard diamond-like carbon films. In this study two different types of DLC films have been studied in respect of their stress and strain characteristics and tribological performance. The coatings are hydrogenated amorphous carbon (a-C:H) coatings deposited by PECVD and tetrahedral amorphous carbon (ta-C) coating deposited by filtered arc technique. In order to evaluate the mechanical behaviour of the coatings under load, 3D FE modelling was carried out in combination with scratch testing. Also the tribological performance was evaluated with pin-on-disc tests using stepwise increasing normal load. The 3D FEM model was developed for calculating the stress and strain distributions of DLC coated systems and to evaluate how coating thickness and elastic properties affect the stress-strain state at crack initiation location. The simulation was compared to the findings to experimental observations in scratch test contact conditions, when the spherical diamond tip was moving with increased load on a coated surface. The coating performance was evaluated with scratch testing to detect the crack generation as well as the coating adhesion. When combining the simulated coating characteristics with empirical observation of coating fracture patterns the coating fracture performance and tolerance to cracking could be evaluated. A major effect of the coating elastic modulus on the stress and fracture behaviour of the coatings was observed. In the tribological testing the both coatings had a low friction performance. In the tribological testing with stepwise increasing load, the critical load for coating delamination was higher for the a-C:H coating, which is in accordance with the results of FE modelling of coating stress state.

AB - DLC films cover a wide range of different carbon based coatings, starting from soft to extremely hard diamond-like carbon films. In this study two different types of DLC films have been studied in respect of their stress and strain characteristics and tribological performance. The coatings are hydrogenated amorphous carbon (a-C:H) coatings deposited by PECVD and tetrahedral amorphous carbon (ta-C) coating deposited by filtered arc technique. In order to evaluate the mechanical behaviour of the coatings under load, 3D FE modelling was carried out in combination with scratch testing. Also the tribological performance was evaluated with pin-on-disc tests using stepwise increasing normal load. The 3D FEM model was developed for calculating the stress and strain distributions of DLC coated systems and to evaluate how coating thickness and elastic properties affect the stress-strain state at crack initiation location. The simulation was compared to the findings to experimental observations in scratch test contact conditions, when the spherical diamond tip was moving with increased load on a coated surface. The coating performance was evaluated with scratch testing to detect the crack generation as well as the coating adhesion. When combining the simulated coating characteristics with empirical observation of coating fracture patterns the coating fracture performance and tolerance to cracking could be evaluated. A major effect of the coating elastic modulus on the stress and fracture behaviour of the coatings was observed. In the tribological testing the both coatings had a low friction performance. In the tribological testing with stepwise increasing load, the critical load for coating delamination was higher for the a-C:H coating, which is in accordance with the results of FE modelling of coating stress state.

KW - A-C:H

KW - DLC

KW - modelling

KW - Ta-C

KW - tribology

KW - ProperTune

M3 - Article

VL - 31

SP - 3

EP - 10

JO - Tribologia

JF - Tribologia

SN - 0780-2285

IS - 3-4

ER -