Nanoscale Run-In of Silicon Oxide-Doped Hydrogenated Amorphous Carbon: Dependence of Interfacial Shear Strength on Sliding Length and Humidity.
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| Title: | Nanoscale Run-In of Silicon Oxide-Doped Hydrogenated Amorphous Carbon: Dependence of Interfacial Shear Strength on Sliding Length and Humidity. |
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| Authors: | McClimon, J. B.1 (AUTHOR) mcclimon@seas.upenn.edu, Hilbert, J.2 (AUTHOR), Lukes, J. R.2 (AUTHOR), Carpick, R. W.2 (AUTHOR) |
| Source: | Tribology Letters. Sep2020, Vol. 68 Issue 3, p1-14. 14p. |
| Abstract: | We conducted atomic force microscopy (AFM) experiments by sliding hard tetrahedral amorphous carbon (ta-C)-coated and diamond AFM probes against silicon oxide-doped hydrogenated amorphous carbon (a-C:H:Si:O) films. We reproducibly observe a substantial reduction in friction with repeated sliding. This behavior qualitatively resembles the run-in effects generally seen in macroscale frictional sliding on diamond-like carbons (DLCs), including this a-C:H:Si:O film in particular. As the applied normal load is increased with repetitive sliding, the friction reduces in tandem. The lateral stiffness of the nanoscale contact is measured as a function of applied normal load, thus the real contact area and the interfacial shear strength are inferred throughout the sliding experiments. These measurements show that the friction reduction is caused by a reduction in the interfacial shear strength of the contact. We propose that this arises from sliding-induced structural modification of the a-C:H:Si:O film. The calculated shear strengths are more than an order of magnitude higher than estimates from macroscale friction experiments. Additionally, humidity-controlled experiments show no significant humidity dependence of the friction despite a very strong dependence at macroscale. Reasons for these contradictions with macroscale experiments are discussed. [ABSTRACT FROM AUTHOR] |
| Copyright of Tribology Letters is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 145029459 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Nanoscale Run-In of Silicon Oxide-Doped Hydrogenated Amorphous Carbon: Dependence of Interfacial Shear Strength on Sliding Length and Humidity. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22McClimon%2C+J%2E+B%2E%22">McClimon, J. B.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mcclimon@seas.upenn.edu</i><br /><searchLink fieldCode="AR" term="%22Hilbert%2C+J%2E%22">Hilbert, J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lukes%2C+J%2E+R%2E%22">Lukes, J. R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Carpick%2C+R%2E+W%2E%22">Carpick, R. W.</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tribology+Letters%22">Tribology Letters</searchLink>. Sep2020, Vol. 68 Issue 3, p1-14. 14p. – Name: Abstract Label: Abstract Group: Ab Data: We conducted atomic force microscopy (AFM) experiments by sliding hard tetrahedral amorphous carbon (ta-C)-coated and diamond AFM probes against silicon oxide-doped hydrogenated amorphous carbon (a-C:H:Si:O) films. We reproducibly observe a substantial reduction in friction with repeated sliding. This behavior qualitatively resembles the run-in effects generally seen in macroscale frictional sliding on diamond-like carbons (DLCs), including this a-C:H:Si:O film in particular. As the applied normal load is increased with repetitive sliding, the friction reduces in tandem. The lateral stiffness of the nanoscale contact is measured as a function of applied normal load, thus the real contact area and the interfacial shear strength are inferred throughout the sliding experiments. These measurements show that the friction reduction is caused by a reduction in the interfacial shear strength of the contact. We propose that this arises from sliding-induced structural modification of the a-C:H:Si:O film. The calculated shear strengths are more than an order of magnitude higher than estimates from macroscale friction experiments. Additionally, humidity-controlled experiments show no significant humidity dependence of the friction despite a very strong dependence at macroscale. Reasons for these contradictions with macroscale experiments are discussed. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Tribology Letters is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s11249-020-01319-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 1 Titles: – TitleFull: Nanoscale Run-In of Silicon Oxide-Doped Hydrogenated Amorphous Carbon: Dependence of Interfacial Shear Strength on Sliding Length and Humidity. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: McClimon, J. B. – PersonEntity: Name: NameFull: Hilbert, J. – PersonEntity: Name: NameFull: Lukes, J. R. – PersonEntity: Name: NameFull: Carpick, R. W. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 10238883 Numbering: – Type: volume Value: 68 – Type: issue Value: 3 Titles: – TitleFull: Tribology Letters Type: main |
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