Characteristic of absorbing sound in lotus-type porous copper fabricated by unidirectional solidification

被引：1
作者：
Xie, ZK [1 ]
Ikeda, T [1 ]
Okuda, Y [1 ]
Nakajima, H [1 ]
机构：
[1] Osaka Univ, Inst Sci & Ind Res, Ibaraki 5670047, Japan
来源：
JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2004年 / 68卷 / 03期
关键词：
copper; penetration rate; absorption coefficient; porosity; pore size;
D O I：
10.2320/jinstmet.68.185
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Lotus-type porous copper with a high number of unidirectional cylindrical pores was fabricated by unidirectional solidification of melt dissolving hydrogen in a pressurized hydrogen atmosphere. The sound absorption coefficient of porous copper whose specimen face has many open pores was measured by a standing-wave method in the range up to the sound frequency of 4 kHz. The absorption coefficient increases with increasing frequency. The absorption coefficient increases with increasing porosity and specimen thickness, while it decreases with increasing pore size. In addition, it was understood that the absorption coefficient of lotus-type porous materials can be determined by using the attenuation constant.
引用
收藏
页码：185 / 190
页数：6
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