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Effect of Annealing, Doping and Humidity on the Tribological Properties of Sputter Coated ZnO Films for Solid Lubricating Applications

Ravindran Manu, Bodhi
http://orcid.org/0000-0002-6179-5455
http://rave.ohiolink.edu/etdc/view?acc_num=toledo16558979740616

Abstract Details

2022, Doctor of Philosophy, University of Toledo, Engineering.
Solid lubricants are materials with a layered crystal structure that provide lubrication in conditions where conventional liquid lubricants are unstable. They are used in extreme environmental and working conditions processes such as high and vacuumed pressure, cryogenic and high temperatures, corrosive and radiative environments, high loads and sliding velocity. Such conditions are mainly encountered in aerospace and marine applications. Some commercially used solid lubricants include 2D materials such as graphite, MoS2, h-BN. However, these materials lack good anti-wear properties and manufacture of lubricating composites where the lubricant is dispersed in a wear resistant matrix is the widely used method for increasing their wear resistance. Heavy metal doping that facilitates grain boundary strengthening and restricts the motion of dislocations across the grain boundary is also employed for improved wear properties. Another challenge of solid lubricants is the narrow operating range. Their lubricating properties drastically deteriorate with changes from specified operating parameters. Adaptive lubrication, where the lubricating mechanism changes with operating parameters is employed to increase the working range of these lubricants. This dissertation work focusses on understanding and improving the tribological properties of sputter deposited ZnO films. ZnO possess some desirable properties compared with existing solid lubricants. It has high-temperature stability, corrosion resistance, and radiation stability. Presently, commercially used solid lubricants are greatly influenced by these environmental parameters. Hence ZnO is a suitable candidate for developing solid lubricants with broad operating range. In this work, the effect of humidity and annealing on the coefficient of friction and wear life are primarily investigated. Pin-on-Disk tribo-test were conducted on sub stoichiometric ZnO films with silver, aluminium and nitrogen doping to understand its effect on tribo-properties and lattice structure. The effect of titanium buffer on the growth mechanism of sub-stochiometric ZnO and its influence on tribo-properties were also investigated. The influence of humidity and annealing on the stability of tribo-films were also experimentally determined. The fundamental objective of this research work was to understand the effects of humidity, annealing, film deposition and tribo-test parameters on tribological performance to help develop sputter deposited ZnO films with superior wear life
Ahalapitiya H. Jayatissa (Committee Chair)
Adam Schroeder (Committee Member)
Sorin Cioc (Committee Member)
Lesley Berhan (Committee Member)
Champa A. Jayasuriya (Committee Member)
128 p.
Materials Science; Mechanical Engineering; Mechanics
Tribology, coefficient of friction, wear-life, tribo-film, pin-on-disk tribometer

Recommended Citations

Citations

  • Ravindran Manu, B. (2022). Effect of Annealing, Doping and Humidity on the Tribological Properties of Sputter Coated ZnO Films for Solid Lubricating Applications [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo16558979740616

    APA Style (7th edition)

  • Ravindran Manu, Bodhi. Effect of Annealing, Doping and Humidity on the Tribological Properties of Sputter Coated ZnO Films for Solid Lubricating Applications. 2022. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo16558979740616.

    MLA Style (8th edition)

  • Ravindran Manu, Bodhi. "Effect of Annealing, Doping and Humidity on the Tribological Properties of Sputter Coated ZnO Films for Solid Lubricating Applications." Doctoral dissertation, University of Toledo, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=toledo16558979740616

    Chicago Manual of Style (17th edition)

toledo16558979740616
42
© 2022, some rights reserved.Creative Commons License Effect of Annealing, Doping and Humidity on the Tribological Properties of Sputter Coated ZnO Films for Solid Lubricating Applications by Bodhi Ravindran Manu is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Toledo and OhioLINK.