A comparative analysis of sound absorption performance of ZL104/aluminum fiber composite foam
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A comparative analysis of sound absorption performance of ZL104/aluminum fiber composite foam Yingwu Wang1, Xiaoqing Zuo1,a)
, Dehao Kong1, Yun Zhou1
1
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China Address all correspondence to this author. e-mail: [email protected]
a)
Received: 8 June 2019; accepted: 1 August 2019
ZL104 alloy foam and ZL104 alloy/aluminum fiber composite foams with a porosity of 71–90% were prepared by an infiltration casting method. The pore structure and the sound absorption properties of these two kinds of foams were studied. The results show that fibers partially embedded in the porous pore walls and partially extending out of the pore in the composite foams. The sound absorption coefficient of the foams has a sound absorption peak and a sound absorption trough with increasing frequency. The fiber composite foam possesses better sound absorption properties compared with the alloy foam. As porosity, fiber diameter, and fiber content increases, the average sound absorption coefficient of the composite foam first increases and then decreases. The average sound absorption coefficient (0.88) of the composite foam with a fiber content of 5 vol%, a fiber diameter of 0.1 mm, and a porosity of 82% increased 10% compared with that of the alloy foam. The surface roughness and specific surface area of the foam increase after fiber compounding, and the sound wave drives the fibers to vibrate to enlarge the consumption of sound energy.
Introduction Aluminum foam with an open-cell structure has high specific strength, damping, temperature resistance, and recovery [1, 2, 3, 4, 5]. Open-cell aluminum foam has a particularly strong sound absorption ability for noise in frequencies greater than 800 Hz and is suitable for use in the fields such as noise control for air compressors and generators, viaduct and highway sound-absorbing walls, high-speed rail and subways, mechanical devices, recording studios, and swimming pools [6, 7, 8, 9]. In recent years, Lu [10, 11], Dupere [12], Han [13], Zhang [14], and Chen et al. [15] have studied the relationship between the sound absorption coefficient and the pore structure of porous metals. Results show that improved sound absorption property of the foam metal can be achieved when the pore size is smaller, porosity is higher, and the material is thicker. Moreover, the sound absorption property of the aluminum foam can be improved by controlling the pore structure [16, 17, 18, 19, 20, 21, 22, 23, 24, 25]. For example, when the porosity is constant, reducing the pore size or increasing the number of holes in the cell wall can improve the sound absorption performance of the foam metal [23]. Also, the sound absorption coefficient of foam metal in the medium and high
ª Materials Research Society 2019
frequency range can be improved via the pore size range that can be widened, gradient, and periodicity [20, 23, 24, 25]. Infiltration casting is a common method for preparing opencell sound absorbing aluminum foam [18, 21]
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