Adsorption and lubricating properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) additives in water-lubricated copper vs. a-C:H contacts

Timo J. Hakala, Jarkko Metsäjoki, Niko Granqvist, Roberto Milani, Géza R. Szilvay, Oskari Elomaa, Mengmeng Deng, Jianjun Zhang, Feng Li

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

In a metal forming process the adhesion between the workpiece and the tool needs to be minimised, which can be achieved by use of lubricants and coatings. Here adsorption and lubrication properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) in water-lubricated copper vs. a-C:H coating contacts were studied by Surface Plasmon Resonance (SPR) and by a pin-on-disc (POD) tribometer. Hydrophobins formed a dense monolayer film on a-C:H surface and reduced friction by 13-30% but increased the wear of copper compared to pure water lubrication. Poly(methyl methacrylate-b-sodium acrylate) formed a sparse lubricating layer compared to HFBII lubricated contacts, but the friction coefficient was lower. HFBII molecules prevented copper oxide tribofilm formation on the copper pin.
Original languageEnglish
Pages (from-to)60-66
JournalTribology International
Volume90
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Polymethyl Methacrylate
acrylates
Polymethyl methacrylates
polymethyl methacrylate
Block copolymers
Copper
copolymers
Sodium
sodium
lubrication
Adsorption
copper
Hydrogen
adsorption
Lubrication
Water
Friction
water
coatings
Coatings

Keywords

  • DLC
  • water lubrication
  • hydrophobins
  • tribology

Cite this

@article{839b36d355de4c03b2c33959068334a5,
title = "Adsorption and lubricating properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) additives in water-lubricated copper vs. a-C:H contacts",
abstract = "In a metal forming process the adhesion between the workpiece and the tool needs to be minimised, which can be achieved by use of lubricants and coatings. Here adsorption and lubrication properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) in water-lubricated copper vs. a-C:H coating contacts were studied by Surface Plasmon Resonance (SPR) and by a pin-on-disc (POD) tribometer. Hydrophobins formed a dense monolayer film on a-C:H surface and reduced friction by 13-30{\%} but increased the wear of copper compared to pure water lubrication. Poly(methyl methacrylate-b-sodium acrylate) formed a sparse lubricating layer compared to HFBII lubricated contacts, but the friction coefficient was lower. HFBII molecules prevented copper oxide tribofilm formation on the copper pin.",
keywords = "DLC, water lubrication, hydrophobins, tribology",
author = "Hakala, {Timo J.} and Jarkko Mets{\"a}joki and Niko Granqvist and Roberto Milani and Szilvay, {G{\'e}za R.} and Oskari Elomaa and Mengmeng Deng and Jianjun Zhang and Feng Li",
year = "2015",
doi = "10.1016/j.triboint.2015.04.006",
language = "English",
volume = "90",
pages = "60--66",
journal = "Tribology International",
issn = "0301-679X",
publisher = "Elsevier",

}

Adsorption and lubricating properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) additives in water-lubricated copper vs. a-C:H contacts. / Hakala, Timo J.; Metsäjoki, Jarkko; Granqvist, Niko; Milani, Roberto; Szilvay, Géza R.; Elomaa, Oskari; Deng, Mengmeng; Zhang, Jianjun; Li, Feng.

In: Tribology International, Vol. 90, 2015, p. 60-66.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Adsorption and lubricating properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) additives in water-lubricated copper vs. a-C:H contacts

AU - Hakala, Timo J.

AU - Metsäjoki, Jarkko

AU - Granqvist, Niko

AU - Milani, Roberto

AU - Szilvay, Géza R.

AU - Elomaa, Oskari

AU - Deng, Mengmeng

AU - Zhang, Jianjun

AU - Li, Feng

PY - 2015

Y1 - 2015

N2 - In a metal forming process the adhesion between the workpiece and the tool needs to be minimised, which can be achieved by use of lubricants and coatings. Here adsorption and lubrication properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) in water-lubricated copper vs. a-C:H coating contacts were studied by Surface Plasmon Resonance (SPR) and by a pin-on-disc (POD) tribometer. Hydrophobins formed a dense monolayer film on a-C:H surface and reduced friction by 13-30% but increased the wear of copper compared to pure water lubrication. Poly(methyl methacrylate-b-sodium acrylate) formed a sparse lubricating layer compared to HFBII lubricated contacts, but the friction coefficient was lower. HFBII molecules prevented copper oxide tribofilm formation on the copper pin.

AB - In a metal forming process the adhesion between the workpiece and the tool needs to be minimised, which can be achieved by use of lubricants and coatings. Here adsorption and lubrication properties of HFBII hydrophobins and diblock copolymer poly(methyl methacrylate-b-sodium acrylate) in water-lubricated copper vs. a-C:H coating contacts were studied by Surface Plasmon Resonance (SPR) and by a pin-on-disc (POD) tribometer. Hydrophobins formed a dense monolayer film on a-C:H surface and reduced friction by 13-30% but increased the wear of copper compared to pure water lubrication. Poly(methyl methacrylate-b-sodium acrylate) formed a sparse lubricating layer compared to HFBII lubricated contacts, but the friction coefficient was lower. HFBII molecules prevented copper oxide tribofilm formation on the copper pin.

KW - DLC

KW - water lubrication

KW - hydrophobins

KW - tribology

U2 - 10.1016/j.triboint.2015.04.006

DO - 10.1016/j.triboint.2015.04.006

M3 - Article

VL - 90

SP - 60

EP - 66

JO - Tribology International

JF - Tribology International

SN - 0301-679X

ER -