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Effect of the addition of Si into V2O5 coatings: Structure and tribo-mechanical properties

Effect of the addition of Si into V2O5 coatings: Structure and tribo-mechanical properties
Effect of the addition of Si into V2O5 coatings: Structure and tribo-mechanical properties

Vanadium oxide (V2O5) is one of the lubricious oxides with the potential to be used as a solid lubricant at elevated temperatures. However, the material itself is not hard wear-resistant, so most of the research has focused on adding V into hard nitride coatings that could lead to the formation of a self-lubricating V2O5 layer when heated. The other possible solution, which has been less studied, is to look for mechanisms to enhance the hardness of the oxide coating. In this research, we investigate the effect of the addition of Si into the V2O5 coatings, aiming to find conditions that lead to enhance hardness and/or reduced wear while keeping the high temperature lubricity of the V2O5 structure. For this, Si modified V2O5 coatings were deposited using a dual magnetron sputtering system. The results showed that small additions of Si (<2.0 at%) improved the hardness of the V2O5 coatings up to 5 times while keeping the same temperature dependence of the coefficient of friction than V2O5. Dry sliding experiments using the pin-on-disc configuration against silicon nitride balls were performed at 25, 300 and 600 °C. Wear factors in the 10−7 mm3/Nm range were obtained, indicating a good wear resistance. Further addition of Si into the V2O5 structure led to a loss of the crystalline ordering and a significant reduction in the hardness.

Hall-Petch, Hardening, Lubricity, Oxidation resistance, Sputtering, Tribological coatings
0257-8972
111-118
Mirabal-Rojas, Roberto
d2f8c5c9-4e0a-4ba7-95d9-6d8a6855d1e8
Rodil, Sandra E.
13d8342c-6e07-4b00-ab67-a04b50752ed8
Ramirez, Giovanni
15afad5e-f80d-4425-ba76-33c21d84ab15
Polcar, Tomas
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Camps, Enrique
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Erdemir, Ali
e96c8e0a-e4b7-40a1-aece-f707805108c2
Mirabal-Rojas, Roberto
d2f8c5c9-4e0a-4ba7-95d9-6d8a6855d1e8
Rodil, Sandra E.
13d8342c-6e07-4b00-ab67-a04b50752ed8
Ramirez, Giovanni
15afad5e-f80d-4425-ba76-33c21d84ab15
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Camps, Enrique
3f6eeec0-8429-4f36-adbe-c3a672c8a601
Erdemir, Ali
e96c8e0a-e4b7-40a1-aece-f707805108c2

Mirabal-Rojas, Roberto, Rodil, Sandra E., Ramirez, Giovanni, Polcar, Tomas, Camps, Enrique and Erdemir, Ali (2018) Effect of the addition of Si into V2O5 coatings: Structure and tribo-mechanical properties. Surface and Coatings Technology, 349, 111-118. (doi:10.1016/j.surfcoat.2018.05.052).

Record type: Article

Abstract

Vanadium oxide (V2O5) is one of the lubricious oxides with the potential to be used as a solid lubricant at elevated temperatures. However, the material itself is not hard wear-resistant, so most of the research has focused on adding V into hard nitride coatings that could lead to the formation of a self-lubricating V2O5 layer when heated. The other possible solution, which has been less studied, is to look for mechanisms to enhance the hardness of the oxide coating. In this research, we investigate the effect of the addition of Si into the V2O5 coatings, aiming to find conditions that lead to enhance hardness and/or reduced wear while keeping the high temperature lubricity of the V2O5 structure. For this, Si modified V2O5 coatings were deposited using a dual magnetron sputtering system. The results showed that small additions of Si (<2.0 at%) improved the hardness of the V2O5 coatings up to 5 times while keeping the same temperature dependence of the coefficient of friction than V2O5. Dry sliding experiments using the pin-on-disc configuration against silicon nitride balls were performed at 25, 300 and 600 °C. Wear factors in the 10−7 mm3/Nm range were obtained, indicating a good wear resistance. Further addition of Si into the V2O5 structure led to a loss of the crystalline ordering and a significant reduction in the hardness.

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Accepted/In Press date: 25 May 2018
e-pub ahead of print date: 26 May 2018
Published date: 15 September 2018
Keywords: Hall-Petch, Hardening, Lubricity, Oxidation resistance, Sputtering, Tribological coatings

Identifiers

Local EPrints ID: 422963
URI: http://eprints.soton.ac.uk/id/eprint/422963
ISSN: 0257-8972
PURE UUID: fc45bcf2-3e05-4648-a64f-78f01f37ed23
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

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Date deposited: 08 Aug 2018 16:31
Last modified: 20 Jul 2019 04:14

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Contributors

Author: Roberto Mirabal-Rojas
Author: Sandra E. Rodil
Author: Giovanni Ramirez
Author: Tomas Polcar ORCID iD
Author: Enrique Camps
Author: Ali Erdemir

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