Robust Mechanical Properties of Electrically Insulative Alumina Films by Supersonic Aerosol Deposition
- Authors
- Lee, Jong-Gun; Cha, You-Hong; Kim, Do-Yeon; Lee, Jong-Hyuk; Lee, Tae-Kyu; Kim, Woo-Young; Park, Jieun; Lee, Dongyun; James, Scott C.; Al-Deyab, Salem S.; Yoon, Sam S.
- Issue Date
- 8월-2015
- Publisher
- SPRINGER
- Keywords
- aerosol deposition; alumina; electrical insulation; hardness; scratchability
- Citation
- JOURNAL OF THERMAL SPRAY TECHNOLOGY, v.24, no.6, pp.1046 - 1051
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THERMAL SPRAY TECHNOLOGY
- Volume
- 24
- Number
- 6
- Start Page
- 1046
- End Page
- 1051
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92934
- DOI
- 10.1007/s11666-015-0257-8
- ISSN
- 1059-9630
- Abstract
- Electrically insulating alumina films were fabricated on steel substrates using supersonic aerosol deposition and their hardness and scratchability were measured. Alumina particles (0.4-mu m diameter) were supersonically sprayed inside a low-pressure chamber using between 1 and 20 nozzle passes. These alumina particles were annealed between 300 and 800 K to determine the temperature's effect on film crystal size (37-41 nm). Smoother surface morphology and increased electrical resistance of the thin films were observed as their thicknesses grew by increasing the number of passes. Resistances of up to 10,000 M Omega demonstrate robust electrical insulation. Significant hardness was measured (1232 hv or 13.33 GPa), but the alumina films could be peeled off with normal loads of 36 and 47 N for films deposited on stainless steel and SKD11 substrates, respectively. High insulation and hardness confirm that these alumina films would make excellent electrical insulators.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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