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http://dx.doi.org/10.7234/kscm.2013.26.1.60

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)
Publication Information
Composites Research / v.26, no.1, 2013 , pp. 60-65 More about this Journal
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
Thin films; Ceramic; Composites; Multilayers; Alumina and zirconia; Thermal expansion;
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