Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Study of Al2O3/ZrO2 (5 nm/20nm) Nanolaminate Composite

  • Balakrishnan, G. (Department of Mechanical Engineering, Changwon National University) ;
  • Wasy, A. (Department of Mechanical Engineering, Changwon National University) ;
  • Ho, Ha Sun (Department of Mechanical Engineering, Changwon National University) ;
  • Sudhakara, P. (Department of Mechanical Engineering, Changwon National University) ;
  • Bae, S.I. (Department of Mechanical Engineering, Changwon National University) ;
  • Song, J.I. (Department of Mechanical Engineering, Changwon National University)
  • Received : 2012.12.03
  • Accepted : 2013.02.15
  • Published : 2013.02.28
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Abstract

A nanolaminate consisting of alternate layers of aluminium oxide ($Al_2O_3$) (5 nm) and zirconium oxide ($ZrO_2$) (20 nm) was deposited at an optimized oxygen partial pressure of $3{\times}10^{-2}$ mbar by pulsed laser deposition. The nanolaminate film was analysed using high temperature X-ray diffraction (HTXRD) to study phase transition and thermal expansion behaviour. The surface morphology was investigated using field emission scanning electron microscopy (FE-SEM). High temperature X-ray diffraction indicated the crystallization temperature of tetragonal zirconia in the $Al_2O_3/ZrO_2$ multilayer-film was 873 K. The mean linear thermal expansion coefficient of tetragonal $ZrO_2$ was $4.7{\times}10^{-6}\;K^{-1}$ along a axis, while it was $13.68{\times}10^{-6}\;K{-1}$ along c axis in the temperature range 873-1373 K. The alumina was in amorphous nature. The FESEM studies showed the formation of uniform crystallites of zirconia with dense surface.

Keywords

References

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