Interactions of Additives on Surfaces via Temperature Programmed Desorption
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University of Akron / OhioLINK
2017
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=akron151394915585005 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron1513949155850052021-08-03T07:05:08Z Interactions of Additives on Surfaces via Temperature Programmed Desorption Seeley, Marisa A. Chemical Engineering Engineering Temperature Programmed Desorption TPD lubrication tribology friction wear desorption kinetics reaction mechanisms Motion under load between any two surfaces that are in contact with each other most likely will develop damage. Lubricants are used between two surfaces in contact to reduce the amount of damage which occurs. Within these lubricants, additives are included to further enhance the beneficial properties such as anti-wear. The overall goal of this project is to build reaction mechanisms and achieve activation energies for the surface reactions that take place. The analogs di-tert-octyl polysulfide (DTOPS) was used for the sulfur class, triphenyl phosphate (TPP) was used for the phosphorous class, and zinc dialkyldithiophosphate (ZDDP) was used for the SP class. Additionally, mineral oil (MO) and fully formulated (FF) oil provided additional information within the scope of this research. Temperature programmed desorption (TPD) was used to identify the reaction species as they desorb from the surface. These surfaces were then analyzed by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) analysis, Fourier transfer infrared (FTIR) spectroscopy, and Raman spectroscopy. Tribological tests such as high frequency reciprocating rig (HFRR) testing studied the wear between two surfaces. The HFRR testing was performed with neat additives, which resulted in the sulfur class to perform the worst, the phosphorous class next, and the SP class performed the best. The HFRR data are used to calculate activation energies in the tribological contact based on the time and temperature that the wear regime begins. The TPD data are used to calculate the activation energies in the bulk desorption inside of a vacuum chamber. The activation energies are compared to see how they change from tribological contact to the bulk desorption. Suggested reaction mechanisms that follow the results are presented. 2017 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron151394915585005 http://rave.ohiolink.edu/etdc/view?acc_num=akron151394915585005 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemical Engineering Engineering Temperature Programmed Desorption TPD lubrication tribology friction wear desorption kinetics reaction mechanisms |
| spellingShingle |
Chemical Engineering Engineering Temperature Programmed Desorption TPD lubrication tribology friction wear desorption kinetics reaction mechanisms Seeley, Marisa A. Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| author |
Seeley, Marisa A. |
| author_facet |
Seeley, Marisa A. |
| author_sort |
Seeley, Marisa A. |
| title |
Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| title_short |
Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| title_full |
Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| title_fullStr |
Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| title_full_unstemmed |
Interactions of Additives on Surfaces via Temperature Programmed Desorption |
| title_sort |
interactions of additives on surfaces via temperature programmed desorption |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2017 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron151394915585005 |
| work_keys_str_mv |
AT seeleymarisaa interactionsofadditivesonsurfacesviatemperatureprogrammeddesorption |
| _version_ |
1719453000590688256 |