32. Fabrication and Damping Behavior of Barium Titanate Reinforced Copper Matrix Composites

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. T. A. Asare,
  2. J. P. Schultz,
  3. B. D. Poquette,
  4. A. O. Aning and
  5. S. L. Kampe

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch32

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Asare, T. A., Schultz, J. P., Poquette, B. D., Aning, A. O. and Kampe, S. L. (2005) Fabrication and Damping Behavior of Barium Titanate Reinforced Copper Matrix Composites, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch32

Author Information

  1. Materials Science and Engineering Virginia Tech Blacksburg, VA 24061, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

SEARCH

Keywords:

  • ferroelectric;
  • calorimety;
  • ceramics;
  • rhombohedral;
  • microscope

Summary

The damping behavior of particulate reinforced copper-barium titanate composites (CBT composites) fabricated using powder metallurgy techniques was evaluated between 25°C and 165°C at a frequency of 1 Hz using dynamic mechanical analysis (DMA). Retention of the ferroelectric tetragonal phase of the barium titanate particulates after composite fabrication was determined by differential scanning calorimety (DSC). DMA results indicate that the damping capacity, tanδ, of copper is enhanced by incorporation of barium titanate particulates in the metallic matrix. The magnitude of the enhanced damping was greater for large barium titanate particulate sizes. The damping capacity of this CBT composite was high from room temperature up to the Curie temperature of barium titanate, after which there was a slight drop in damping values. This drop results from a loss of ferroelectric damping mechanisms above the Curie temperature. At the Curie temperature, ferroelectric tetragonal barium titanate transforms into a paraelectric cubic form. In composites fabricated using small barium titanate particulates (∼2 urn), ferroelectricity did not have a significant effect on damping capacity, due to the destabilization of the ferroelectric properties in fine grained and small barium titanate particulates.