Robust Mechanical Properties of Electrically Insulative Alumina Films by Supersonic Aerosol Deposition

Jong Gun Lee, You Hong Cha, Do Yeon Kim, Jong Hyuk Lee, Tae Kyu Lee, Woo Young Kim, Jieun Park, Dongyun Lee, Scott C. James, Salem S. Al-Deyab, Suk Goo Yoon

Research output: Contribution to journalArticle

5 Citations (Scopus)

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-μm 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 MΩ 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.

Original languageEnglish
Pages (from-to)1046-1051
Number of pages6
JournalJournal of Thermal Spray Technology
Volume24
Issue number6
DOIs
Publication statusPublished - 2015 Aug 6

Fingerprint

Aluminum Oxide
Aerosols
aerosols
Alumina
aluminum oxides
mechanical properties
Mechanical properties
hardness
Hardness
Insulation
electrical insulation
Acoustic impedance
Steel
Stainless Steel
Substrates
vacuum chambers
electrical resistance
insulation
Thermal effects
nozzles

Keywords

  • aerosol deposition
  • alumina
  • electrical insulation
  • hardness
  • scratchability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Robust Mechanical Properties of Electrically Insulative Alumina Films by Supersonic Aerosol Deposition. / 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, Suk Goo.

In: Journal of Thermal Spray Technology, Vol. 24, No. 6, 06.08.2015, p. 1046-1051.

Research output: Contribution to journalArticle

Lee, JG, Cha, YH, Kim, DY, Lee, JH, Lee, TK, Kim, WY, Park, J, Lee, D, James, SC, Al-Deyab, SS & Yoon, SG 2015, 'Robust Mechanical Properties of Electrically Insulative Alumina Films by Supersonic Aerosol Deposition', Journal of Thermal Spray Technology, vol. 24, no. 6, pp. 1046-1051. https://doi.org/10.1007/s11666-015-0257-8
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, Suk Goo. / Robust Mechanical Properties of Electrically Insulative Alumina Films by Supersonic Aerosol Deposition. In: Journal of Thermal Spray Technology. 2015 ; Vol. 24, No. 6. pp. 1046-1051.
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