Journal
MATERIALS LETTERS
Volume 134, Issue -, Pages 268-271Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2014.07.082
Keywords
Porous materials; Hollow sphere structures; Microstructure; Sound absorption properties; Acoustical model
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Porous structure with micro-sized open cell was tailored for the sound absorption, and ceramic hollow sphere structures (CUSS) were prepared by low temperature pre-bonding and curing process. Micro-sized open cells of CHSS, which demonstrated normal/bimodal distribution, were mainly observed in the interstitial gaps of fly ashes. The CHSS with micro-sized open cells demonstrated a broadband sound absorption above 500 Hz, and its acoustics behavior was affected significantly by the porous structure. The calculated values of sound absorption based on the Pride-Allard model demonstrated similar trends as experimental results with the increase of frequency. (C) 2014 Elsevier B.V. All rights reserved.
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