Abstract
This study investigated the influence of porosity on the flexural property of a nanoporous alumina film. When the porosity of the alumina film increased, both bending strength and modulus declined. The results from the bending test revealed that the setting of the film during the bending test had significant influence on the flexural property. Fracture only occurred when the porous side of the alumina film suffered tensile stress. The ability to resist fracture in the barrier layer was higher than in the porous side; the magnitude of the bending strength was amplified when the barrier layer sustained tensile stress. When the porous layer suffered a tensile stress, the bending strength decreased from 182.4 MPa to 47.7 Mpa as the porosity increased from 22.7% to 51.7%; meanwhile, the modulus reduced from 82.7 GPa to 17.9 GPa. In this study, the most important finding from fractographic analysis suggested that there were a localized plastic deformations and layered ruptures at the porous side of the alumina film when a load was applied. The fracture behavior of the nanoporous alumina film observed in the present work was notably different from general ceramic materials and might be related to its asymmetric nanostructure.
Highlights
The research and development of nanoporous templates has seen an increase in the number of participating industries and academic organizations
The porous alumina film has drawn a great deal of attention to the fabrication of nanoelectronic devices, such as gas sensors [14,15] and field emission devices [16]
The results of this study could be useful in understanding the fracture mechanism of the nanoporous alumina film
Summary
The research and development of nanoporous templates has seen an increase in the number of participating industries and academic organizations. The barrier layer is dense and forms at the boundary of the aluminium substrate and alumina film [6] Extensive application of this porous alumina film exists because of its nanometer dimension and special structure. How hardness changes for AAO films with various pore sizes, porosities, and crystal structures were offered by Gall et al [23] They noted that the hardness and Young’s modulus of crystalline AAO templates were higher than amorphous ones. In Jeon’s study [24], bending tests were carried out on cantilever beams by pressing AFM tips, and the results were compared with three-point bending tests conducted by using the nano-UTM They found that Young’s modulus was the same, approximately 30 to 40 GPa, in both measurements and the existence of clogged and open layers did not affect the stress distribution in the porous layer or its modulus. The results of this study could be useful in understanding the fracture mechanism of the nanoporous alumina film
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