Journal of Porous Materials

, Volume 15, Issue 6, pp 673–677 | Cite as

Internal friction of capsule-free HIPed porous alumina



Porous alumina were sintered by conventional sintering and capsule-free Hot Isostatic Pressing (HIPing), at temperatures between 800 and 1500 °C under pressures 0.1 MPa or 200 MPa for 1 h or 50 h. Young’s modulus and internal friction of samples were measured by resonance method. The results show that Young’s modulus is mainly dominated by porosity of material. Capsule-free HIPed porous materials have slightly higher Young’s modulus than conventionally sintered ones at the same porosity. Internal friction is governed by both porosity and specific surface area. Capsule-free HIPed porous alumina has lower internal friction coefficient than conventionally sintered ones at the similar porosity or at the similar specific surface area. Enhanced surface-self diffusion under high gas pressure reduces internal friction coefficient, and affects internal friction more than Young’s modulus.


Porous alumina Internal friction Capsule-free HIP 


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Tetsu Takahashi
    • 1
  • Koji Matsumaru
    • 1
  • Kozo Ishizaki
    • 1
  1. 1.Department of Materials Science and Engineering Nagaoka University of TechnologyNiigataJapan

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