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Effect of polarization on fracture toughness of BaTiO3/Al2O3 composites by Sirirat Rattanachan; Yukio Miyashita; Yoshiharu Mutoh is a Materials Science article available to read on EtoBox.

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In this study, Al 2 O 3 based composites dispersed with BaTiO 3 particles were fabricated by a conventional sintering process. The relative density and microstructure (grain size, phase) of composites were studied. The relative density of BaTiO 3 /Al 2 O 3 composites decreased with increasing BaTiO 3 content, and there were reaction phases between Al 2 O 3 matrix and dispersed BaTiO 3 particles. The Indentation Fracture Method was used to evaluate the fracture toughness of the present composites before and after polarization. It was verified that an applied electric field induced distinct anisotropy in fracture toughness of BaTiO 3 /Al 2 O 3 composites between parallel and perpendicular directions to the poling direction. The fracture toughness was improved with addition of BaTiO 3 particles to Al 2 O 3 matrix. The toughening mechanisms of BaTiO 3 /Al 2 O 3 composites have been also discussed.

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Author

Sirirat Rattanachan; Yukio Miyashita; Yoshiharu Mutoh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)