Internal friction of capsule-free HIPed porous alumina |
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Authors: | Tetsu Takahashi Koji Matsumaru Kozo Ishizaki |
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Affiliation: | (1) Department of Materials Science and Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan |
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Abstract: | 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. |
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Keywords: | Porous alumina Internal friction Capsule-free HIP |
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