Nanoscale friction as a function of activation energies
Understanding the scale-dependence of friction is increasingly viewed as a critical quest. With progressively thinnerfilms, mixed and boundary regimes oflubrication have become commonplace. Therefore, at the micro-scale a greater need for mitigating friction is desired in order to improve operationa...
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| Format: | Article |
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IOP Publishing Ltd
2015
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| _version_ | 1796860545712783360 |
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| author | Chong, William Woei Fong Rahnejat, Homer |
| author_facet | Chong, William Woei Fong Rahnejat, Homer |
| author_sort | Chong, William Woei Fong |
| collection | ePrints |
| description | Understanding the scale-dependence of friction is increasingly viewed as a critical quest. With progressively thinnerfilms, mixed and boundary regimes oflubrication have become commonplace. Therefore, at the micro-scale a greater need for mitigating friction is desired in order to improve operational efficiency of many machines and mechanisms. Furthermore, there is a growing tendency to use low friction hard wear-resistant advanced coatings to guard against wear. In parallel, there has been much attention paid to lubricant rheology and formulation. However, only in recent times there has been an emerging view of lubricant-surface combination as a system. In this perspective it is essential to relate the observed and measured friction at component level to the underlying interactions in micro/nano-scales. This is the approach inthis paper. Observed phenomenon at micro-scale are related back to the activation energies of lubricant-surface system, providing in particular results for surface modified Ni-SiC coated specimen in combination with formulated lubricants, the combination of which represent the lubricant-surface system of choice in cylinders of high performance race engine. The nano-scale conjunction of an AFM tip with lubricated surface engineered specimen, subjected to various conjunctional loading and sliding kinematics is investigated. It is shown that the measured frictional characteristics can be adequately described in terms of activation energies in line with the Eyring's thermal activation model for cases of fairly smooth asperity tip contact conjunctions. |
| first_indexed | 2024-03-05T19:42:58Z |
| format | Article |
| id | utm.eprints-58625 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T19:42:58Z |
| publishDate | 2015 |
| publisher | IOP Publishing Ltd |
| record_format | dspace |
| spelling | utm.eprints-586252021-12-15T01:28:30Z http://eprints.utm.my/58625/ Nanoscale friction as a function of activation energies Chong, William Woei Fong Rahnejat, Homer TJ Mechanical engineering and machinery Understanding the scale-dependence of friction is increasingly viewed as a critical quest. With progressively thinnerfilms, mixed and boundary regimes oflubrication have become commonplace. Therefore, at the micro-scale a greater need for mitigating friction is desired in order to improve operational efficiency of many machines and mechanisms. Furthermore, there is a growing tendency to use low friction hard wear-resistant advanced coatings to guard against wear. In parallel, there has been much attention paid to lubricant rheology and formulation. However, only in recent times there has been an emerging view of lubricant-surface combination as a system. In this perspective it is essential to relate the observed and measured friction at component level to the underlying interactions in micro/nano-scales. This is the approach inthis paper. Observed phenomenon at micro-scale are related back to the activation energies of lubricant-surface system, providing in particular results for surface modified Ni-SiC coated specimen in combination with formulated lubricants, the combination of which represent the lubricant-surface system of choice in cylinders of high performance race engine. The nano-scale conjunction of an AFM tip with lubricated surface engineered specimen, subjected to various conjunctional loading and sliding kinematics is investigated. It is shown that the measured frictional characteristics can be adequately described in terms of activation energies in line with the Eyring's thermal activation model for cases of fairly smooth asperity tip contact conjunctions. IOP Publishing Ltd 2015 Article PeerReviewed Chong, William Woei Fong and Rahnejat, Homer (2015) Nanoscale friction as a function of activation energies. Surface Topography-Metrology and Properties, 3 (4). 044002-044002. ISSN 2051-672X http://dx.doi.org/10.1088/2051-672X/3/4/044002 DOI:10.1088/2051-672X/3/4/044002 |
| spellingShingle | TJ Mechanical engineering and machinery Chong, William Woei Fong Rahnejat, Homer Nanoscale friction as a function of activation energies |
| title | Nanoscale friction as a function of activation energies |
| title_full | Nanoscale friction as a function of activation energies |
| title_fullStr | Nanoscale friction as a function of activation energies |
| title_full_unstemmed | Nanoscale friction as a function of activation energies |
| title_short | Nanoscale friction as a function of activation energies |
| title_sort | nanoscale friction as a function of activation energies |
| topic | TJ Mechanical engineering and machinery |
| work_keys_str_mv | AT chongwilliamwoeifong nanoscalefrictionasafunctionofactivationenergies AT rahnejathomer nanoscalefrictionasafunctionofactivationenergies |