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Materials 2015, 8(11), 7511-7518; doi:10.3390/ma8115395

Sound Absorption Characteristics of Aluminum Foams Treated by Plasma Electrolytic Oxidation

1
Key Laboratory of Automobile Materials (Ministry of Education), College of Materials Science and Engineering, Jilin University, Changchun 130022, China
2
Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China
3
School of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Academic Editor: Sven De Schampheleire
Received: 27 July 2015 / Revised: 12 October 2015 / Accepted: 15 October 2015 / Published: 9 November 2015
(This article belongs to the Special Issue Metal Foams: Synthesis, Characterization and Applications)
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Abstract

Open-celled aluminum foams with different pore sizes were fabricated. A plasma electrolytic oxidation (PEO) treatment was applied on the aluminum foams to create a layer of ceramic coating. The sound absorption coefficients of the foams were measured by an impedance tube and they were calculated by a transfer function method. The experimental results show that the sound absorption coefficient of the foam increases gradually with the decrease of pore size. Additionally, when the porosity of the foam increases, the sound absorption coefficient also increases. The PEO coating surface is rough and porous, which is beneficial for improvement in sound absorption. After PEO treatment, the maximum sound absorption of the foam is improved to some extent. View Full-Text
Keywords: foams; aluminum; plasma electrolytic oxidation; sound absorption foams; aluminum; plasma electrolytic oxidation; sound absorption
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jin, W.; Liu, J.; Wang, Z.; Wang, Y.; Cao, Z.; Liu, Y.; Zhu, X. Sound Absorption Characteristics of Aluminum Foams Treated by Plasma Electrolytic Oxidation. Materials 2015, 8, 7511-7518.

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