Mechanical and tribological properties of WO2.9 and ZrO2 + WO2.9 composites studied by nanoindentation and reciprocating wear tests

M. Erkin Cura; Michal Trebala; Yanling Ge; Piotr Klimczyk; Simo-Pekka Hannula

doi:10.1016/j.wear.2021.203920

Mechanical and tribological properties of WO_2.9 and ZrO₂ + WO_2.9 composites studied by nanoindentation and reciprocating wear tests

M. Erkin Cura^*, Michal Trebala, Yanling Ge, Piotr Klimczyk, Simo-Pekka Hannula

^*Corresponding author for this work

Krakow Technology Institute

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

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Abstract

Oxygen vacancies in WO_2.9 yield to formation of easy shear planes and they can potentially be applied in boundary lubrication conditions for reducing friction. Mechanical and tribological properties of pulsed electric current sintered monolithic WO_2.9 were studied by nanoindentation and nanoscratch, and the composites of ZrO₂ + WO_2.9 with reciprocating wear tests. Hardness of WO_2.9 at 25 °C was ~11 GPa and reduced elastic modulus was ~150 GPa. The ploughing dominated coefficient of friction as between 0.09 and 0.24 when measured against a Berkovich diamond tip. The composite n-ZrO₂ + 10 vol% WO_2.9 presented the lowest CoF, and wear rate 10⁻¹⁰ mm³/Nm measured under 10 N load against alumina ball (6 mm diameter) due to WO_2.9 acting as a solid lubricant.

Original language	English
Article number	203920
Number of pages	12
Journal	Wear
Volume	478-479
Early online date	21 Apr 2021
DOIs	https://doi.org/10.1016/j.wear.2021.203920
Publication status	Published - 15 Aug 2021
MoE publication type	A1 Journal article-refereed

Keywords

Crystallographic shear
Nanoindentation
Raman
Solid lubrication

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CHEM_Cura_et_al_Mechanical_and_tribological_properties_2021_WearFinal published version, 12 MBLicence: CC BY

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title = "Mechanical and tribological properties of WO2.9 and ZrO2 + WO2.9 composites studied by nanoindentation and reciprocating wear tests",

abstract = "Oxygen vacancies in WO2.9 yield to formation of easy shear planes and they can potentially be applied in boundary lubrication conditions for reducing friction. Mechanical and tribological properties of pulsed electric current sintered monolithic WO2.9 were studied by nanoindentation and nanoscratch, and the composites of ZrO2 + WO2.9 with reciprocating wear tests. Hardness of WO2.9 at 25 °C was ~11 GPa and reduced elastic modulus was ~150 GPa. The ploughing dominated coefficient of friction as between 0.09 and 0.24 when measured against a Berkovich diamond tip. The composite n-ZrO2 + 10 vol% WO2.9 presented the lowest CoF, and wear rate 10−10 mm3/Nm measured under 10 N load against alumina ball (6 mm diameter) due to WO2.9 acting as a solid lubricant.",

keywords = "Crystallographic shear, Nanoindentation, Raman, Solid lubrication",

author = "Cura, {M. Erkin} and Michal Trebala and Yanling Ge and Piotr Klimczyk and Simo-Pekka Hannula",

note = "Funding Information: This work was supported partially within the framework of the SINTERCER project (REGPOT-2012-2013-1 EUFP7, project no. 316232 ) by the European Commission under the FP7 Specific Programme {\textquoteleft}Capacities{\textquoteright}), and by Academy of Finland via Graduate School for Advanced Materials and Processes (Grant 118728 ). Dr. Ajai Iyer is acknowledged for his help in Raman measurements and Mr. Andreas Friman for his help with tribology tests. Mr. Joonas Lehtonen is acknowledged for helpful discussions. Publisher Copyright: {\textcopyright} 2021 The Authors Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2021",

month = aug,

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doi = "10.1016/j.wear.2021.203920",

language = "English",

volume = "478-479",

journal = "Wear",

issn = "0043-1648",

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AU - Cura, M. Erkin

AU - Trebala, Michal

AU - Ge, Yanling

AU - Klimczyk, Piotr

AU - Hannula, Simo-Pekka

N1 - Funding Information: This work was supported partially within the framework of the SINTERCER project (REGPOT-2012-2013-1 EUFP7, project no. 316232 ) by the European Commission under the FP7 Specific Programme ‘Capacities’), and by Academy of Finland via Graduate School for Advanced Materials and Processes (Grant 118728 ). Dr. Ajai Iyer is acknowledged for his help in Raman measurements and Mr. Andreas Friman for his help with tribology tests. Mr. Joonas Lehtonen is acknowledged for helpful discussions. Publisher Copyright: © 2021 The Authors Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/8/15

Y1 - 2021/8/15

N2 - Oxygen vacancies in WO2.9 yield to formation of easy shear planes and they can potentially be applied in boundary lubrication conditions for reducing friction. Mechanical and tribological properties of pulsed electric current sintered monolithic WO2.9 were studied by nanoindentation and nanoscratch, and the composites of ZrO2 + WO2.9 with reciprocating wear tests. Hardness of WO2.9 at 25 °C was ~11 GPa and reduced elastic modulus was ~150 GPa. The ploughing dominated coefficient of friction as between 0.09 and 0.24 when measured against a Berkovich diamond tip. The composite n-ZrO2 + 10 vol% WO2.9 presented the lowest CoF, and wear rate 10−10 mm3/Nm measured under 10 N load against alumina ball (6 mm diameter) due to WO2.9 acting as a solid lubricant.

AB - Oxygen vacancies in WO2.9 yield to formation of easy shear planes and they can potentially be applied in boundary lubrication conditions for reducing friction. Mechanical and tribological properties of pulsed electric current sintered monolithic WO2.9 were studied by nanoindentation and nanoscratch, and the composites of ZrO2 + WO2.9 with reciprocating wear tests. Hardness of WO2.9 at 25 °C was ~11 GPa and reduced elastic modulus was ~150 GPa. The ploughing dominated coefficient of friction as between 0.09 and 0.24 when measured against a Berkovich diamond tip. The composite n-ZrO2 + 10 vol% WO2.9 presented the lowest CoF, and wear rate 10−10 mm3/Nm measured under 10 N load against alumina ball (6 mm diameter) due to WO2.9 acting as a solid lubricant.

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KW - Solid lubrication

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Mechanical and tribological properties of WO_2.9 and ZrO₂ + WO_2.9 composites studied by nanoindentation and reciprocating wear tests

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Mechanical and tribological properties of WO2.9 and ZrO2 + WO2.9 composites studied by nanoindentation and reciprocating wear tests

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Mechanical and tribological properties of WO_2.9 and ZrO₂ + WO_2.9 composites studied by nanoindentation and reciprocating wear tests