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Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina

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Abstract:

In this paper, elastic moduli of nanostructured alumina are evaluated by simultaneous measurement of longitudinal and shear wave velocities using mode-converted ultrasound in scanning acoustic microscope (SAM). Mode-converted longitudinal and shear waves inside alumina sample are captured to calculate acoustic wave velocities and determine elastic constants such as Young’s modulus and Bulk modulus. Al2O3 nanostructured alumina samples are formed by compacting micro-sized Al2O3 powder with nano-sized Al2O3 powder from 10wt% to 50wt%, and tested by SAM to investigate elastic moduli. A correlation is found from experiment that the more percentage of nano-particles are added, the higher elastic moduli are obtained. It is also shown that the mode-converted ultrasound is sensitive enough to characterize mechanical modulus of nanostructured alumina quantitatively.

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Periodical:

Key Engineering Materials (Volumes 321-323)

Pages:

1711-1714

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.321-323.1711

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Online since:

October 2006

Authors:

Noh Yu Kim, Hee Joon Kim, Se Woong Oh, N. Hozumi, Cheol Kyou Lee, Min Sung Hong

Keywords:

Elastic Property, Mode Conversion, Scanning Acoustic Microscopy (SAM), Sintered Alumina, Ultrasonic Wave Velocities

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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[2] N. Kim et al., Ultrasonic characterization of Elastic Moduli using defocused scanning acoustic microscopy, 2004 Japan-Korea Joint Workshop on Advanced Semiconductor Processes and Equipments(2004), Unzen, Japan, Nov. 18-20.

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DOI: 10.4028/www.scientific.net/kem.317-318.7

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