Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts
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N-doped ZnO thin films were deposited on 304L stainless steel through the pyrolysis of zinc acetate and ammonium acetate in different ratios at a temperature of 420 °C using metal organic chemical vapor deposition. Compositional and structural analyzes of the films were performed by using Rutherford backscattering spectroscopy and X-ray diffraction. The frictional behavior of the thin films and 304L stainless steel substrate was evaluated using a ball-on-flat configuration with reciprocating sliding under marginally lubricated and fully flooded conditions. Al alloy (2017) was used as ball counterface, while basestock synthetic polyalfaolefin oil (PAO10) without additives was used as lubricant. The flat and ball counterface surfaces were examined to assess the wear dimension and failure mechanism. Under marginally lubricated condition, N-doped ZnO thin films provided significant reduction in friction, whereas the films have minimal or no effect in friction under fully flooded condition. N-doped ZnO thin films showed a significant effect in protecting the ball counterface as wear volume was reduced compared with that of the substrate under the marginally lubricated condition. Under the fully flooded condition, with the exception of one of the films, the wear volume of the N-doped ZnO thin films ball reduced compared with that of the substrate. In all the ball counterfaces for N-doped ZnO thin films under both conditions, wear occurred through abrasive mechanism of various degrees or mild polishing. Thus, superfluous lubrication of N-doped ZnO thin films is not necessary to reduce friction and wear.
KeywordsZnO film metal organic chemical vapor deposition friction wear optical microscopy
This work was supported by U.S. Department of Energy, Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, under contract DEAC02- 06CH11357. The authors are also grateful to Center for Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria, for RBS and XRD analyses.
- Li W, Zheng S, Wang P, Chen Q, Song X, Cao B. Preparation of ZnO nanoparticles with enhanced antifriction properties. Asian J Chem 24: 2753–2756 (2012)Google Scholar
- Macias-Sanchez J J, Hinojosa-Reyes L, Caballero-Quintero A, de la Cruz W, Ruiz-Ruiz E, Hernandez-Ramireza A, Guzman-Mar J L. Synthesis of nitrogen-doped ZnO by sol gel method: Characterization and its application on visible photocatalytic degradation of 2, 4-D and picloram herbicides. Photochem Photobiol Sci 14: 536–542 (2015)CrossRefGoogle Scholar
- Mbamara U S, Olofinjana B, Ajayi O O, Lorenzo-Martin C, Obiajunwa E I, Ajayi E O B. Friction and wear behavior of nitrogen-doped ZnO thin films deposited via MOCVD under dry contact. Eng Sci Technol 19: 956–963 (2016)Google Scholar
- Mbamara U S, Olofinjana B, Lorenzo-Martin C, Ajayi O O, Obiajunwa E I, Ajayi E O B. Surface statistical topographical properties of ZnO:N thin films deposited by MOCVD. J NanoSci NanoEng 1: 18–22 (2015)Google Scholar
- Budinski K G, Budinski M K. Engineering Materials, Properties and Selection. New Jersey (USA): Prentice Hall, 2002.Google Scholar
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