Sound absorption performance of a lightweight ceramic foam |
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| Affiliation: | 1. Creative Research Initiative Center for Functionally Antagonistic Nano-Engineering, Department of Mechanical Engineering, School of Mechanical and Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;2. Institute of Advanced Machines and Design, Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 08826, Republic of Korea;1. College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, China;2. Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang, 471023, China;3. Luoyang Ship Material Research Institute, Luoyang, 471023, China;1. Faculty of Science and Technology, Free University of Bozen-Bolzano, Bozen, Italy;2. Engineering and Architecture Department, University of Trieste, Trieste, Italy;3. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Italy |
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| Abstract: | Porous materials can be effective for sound absorption and noise reduction. A kind of lightweight cellular ceramic foam with bulk density of 0.38–0.56 g cm-3 was successfully prepared by conventional molding with pore forming agent. The porosity is from 76.4% to 83.7% for the sample with relatively large pores (the average pore size: 5.3–5.6 mm), and from 74.1% to 81.1% for the sample with relatively small pores (the average pore size: 1.5–1.7 mm). The effects were investigated for processing parameters on the structure of samples, and for the pore size, sample thickness and porosity on the sound absorption performance of samples. The results show that the absorption performance of the ceramic foam product with relatively large pores may be superior to that with relatively small pores in the case of the approximately same porosity. The first absorption peak moves from a higher frequency to a lower frequency with the increase of sample thickness. When the porosity increases, the average sound absorption coefficient increases for all of the samples, and the first absorption peak moves from a higher frequency to a lower frequency for the sample with relatively large pores but does not change for that with relatively small pores. |
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| Keywords: | Porous material Ceramic foam Sound absorption |
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