The control of mechanical strength by an electric field in ceramic composites dispersed with piezoelectric particles

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Abstract

The control of mechanical strength in structural ceramic composite has been proposed and demonstrated by dispersing piezoelectric particles. The change in strength of barium titanate/zirconia composite on polarization treat-ment was evaluated, and the mechanism of this phenome-non is discussed based on the previously proposed mechanism for monolithic piezoelectric ceramics. The bending strength of BT/8YSZ composite increased upon longitudinal poling and decreased upon transverse poling compared to the untreated samples. Both the strengthened and weakened specimens tended to return almost to their original strength by heating over the T c of barium titanate. Scanning electron microscopy was then used to examine the crack propagation after the polarization treatment, and cracks going in the poling direction were found to detour around the barium titanate grains, which was attributable to the increase in strength in the poling direction.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalJournal of Electroceramics
Volume24
Issue number2
DOIs
Publication statusPublished - Apr 2010

Fingerprint

Barium titanate
Strength of materials
Electric fields
ceramics
barium
composite materials
electric fields
Composite materials
Polarization
Structural ceramics
Piezoelectric ceramics
Zirconia
Bending strength
Crack propagation
flexural strength
piezoelectric ceramics
dispersing
crack propagation
polarization
zirconium oxides

Keywords

  • Barium titanate
  • Ceramics
  • Poling
  • Strength
  • Zirconia

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Mechanics of Materials

Cite this

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abstract = "The control of mechanical strength in structural ceramic composite has been proposed and demonstrated by dispersing piezoelectric particles. The change in strength of barium titanate/zirconia composite on polarization treat-ment was evaluated, and the mechanism of this phenome-non is discussed based on the previously proposed mechanism for monolithic piezoelectric ceramics. The bending strength of BT/8YSZ composite increased upon longitudinal poling and decreased upon transverse poling compared to the untreated samples. Both the strengthened and weakened specimens tended to return almost to their original strength by heating over the T c of barium titanate. Scanning electron microscopy was then used to examine the crack propagation after the polarization treatment, and cracks going in the poling direction were found to detour around the barium titanate grains, which was attributable to the increase in strength in the poling direction.",
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