Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS

The coating system MoN-Ag is an interesting candidate for industrial applications as a low friction coating at elevated temperatures, due to the formation of lubricous molybdenum oxides and silver molybdates. Film deposition was performed by high-power impulse magnetron sputtering and direct current...

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Autores principales:	Martin Fenker, Martin Balzer, Sabine Kellner, Tomas Polcar, Andreas Richter, Frank Schmidl, Tomas Vitu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	PVD HiPIMS wear resistant coating low friction coatings tribology Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/c8859e57854b43fbb55549716ba573cc
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spelling	oai:doaj.org-article:c8859e57854b43fbb55549716ba573cc2021-11-25T17:16:59ZFormation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS10.3390/coatings111114152079-6412https://doaj.org/article/c8859e57854b43fbb55549716ba573cc2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1415https://doaj.org/toc/2079-6412The coating system MoN-Ag is an interesting candidate for industrial applications as a low friction coating at elevated temperatures, due to the formation of lubricous molybdenum oxides and silver molybdates. Film deposition was performed by high-power impulse magnetron sputtering and direct current magnetron sputtering. To facilitate a future transfer to industry Mo-Ag composite targets have been sputtered in Ar/N<sub>2</sub> atmosphere. The chemical composition of the deposited MoN-Ag films has been investigated by wavelength dispersive X-ray spectroscopy. Morphology and crystallographic phases of the films were studied by scanning electron microscopy and X-ray diffraction. To obtain film hardness in relation to Ag content and bias voltage, the instrumented indentation test was applied. Pin-on-disc tribological tests have been performed at room temperature and at high temperature (HT, 450 °C). Samples from HT tests have been analyzed by Raman measurements to identify possible molybdenum oxide and/or silver molybdate phases. At low Ag contents (≤7 at.%), coatings with a hardness of 18–31 GPa could be deposited. Friction coefficients at HT decreased with increasing Ag content. After these tests, Raman measurements revealed the MoO<sub>3</sub> phase on all samples and the Ag<sub>2</sub>Mo<sub>4</sub>O<sub>13</sub> phase for the highest Ag contents (~23–26 at.%).Martin FenkerMartin BalzerSabine KellnerTomas PolcarAndreas RichterFrank SchmidlTomas VituMDPI AGarticlePVDHiPIMSwear resistant coatinglow friction coatingstribologyEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1415, p 1415 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	PVD HiPIMS wear resistant coating low friction coatings tribology Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	PVD HiPIMS wear resistant coating low friction coatings tribology Engineering (General). Civil engineering (General) TA1-2040 Martin Fenker Martin Balzer Sabine Kellner Tomas Polcar Andreas Richter Frank Schmidl Tomas Vitu Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
description	The coating system MoN-Ag is an interesting candidate for industrial applications as a low friction coating at elevated temperatures, due to the formation of lubricous molybdenum oxides and silver molybdates. Film deposition was performed by high-power impulse magnetron sputtering and direct current magnetron sputtering. To facilitate a future transfer to industry Mo-Ag composite targets have been sputtered in Ar/N<sub>2</sub> atmosphere. The chemical composition of the deposited MoN-Ag films has been investigated by wavelength dispersive X-ray spectroscopy. Morphology and crystallographic phases of the films were studied by scanning electron microscopy and X-ray diffraction. To obtain film hardness in relation to Ag content and bias voltage, the instrumented indentation test was applied. Pin-on-disc tribological tests have been performed at room temperature and at high temperature (HT, 450 °C). Samples from HT tests have been analyzed by Raman measurements to identify possible molybdenum oxide and/or silver molybdate phases. At low Ag contents (≤7 at.%), coatings with a hardness of 18–31 GPa could be deposited. Friction coefficients at HT decreased with increasing Ag content. After these tests, Raman measurements revealed the MoO<sub>3</sub> phase on all samples and the Ag<sub>2</sub>Mo<sub>4</sub>O<sub>13</sub> phase for the highest Ag contents (~23–26 at.%).
format	article
author	Martin Fenker Martin Balzer Sabine Kellner Tomas Polcar Andreas Richter Frank Schmidl Tomas Vitu
author_facet	Martin Fenker Martin Balzer Sabine Kellner Tomas Polcar Andreas Richter Frank Schmidl Tomas Vitu
author_sort	Martin Fenker
title	Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
title_short	Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
title_full	Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
title_fullStr	Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
title_full_unstemmed	Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS
title_sort	formation of solid lubricants during high temperature tribology of silver-doped molybdenum nitride coatings deposited by dcms and hipims
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c8859e57854b43fbb55549716ba573cc
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Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS

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