FeCrAl纤维多孔材料梯度结构吸声性能的研究  

Study on sound absorption performance of FeCrAl fibrous porous materials gradient structure

作　　者：敖庆波[1] 汤慧萍[1] 朱纪磊[1] 王建永[1] 

机构地区：[1]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《功能材料》2009年第10期1764-1766,共3页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2006CB601201B)

摘　　要：根据前期对单层FeCrAl纤维多孔材料吸声性能的系统研究,对纤维多孔结构进行了优化设计,梯度结构是以孔隙度递减的方式排列而成。分别对单层和梯度结构的吸声性能进行了测试,结果表明,在常温常声压条件下,3层梯度结构低频吸声性能较单层材料有明显提高,而且能够在一个较宽频率范围内的稳态吸声系数平稳延伸,最大值为1;在常温高声强140dB条件下,该结构仍保持较好的稳态吸声性能,在1600～6400Hz宽频范围内的吸声系数均达到0.9以上;在高温常声压条件下,梯度结构的吸声性能受到温度影响有所下降,且吸声系数不随频率的升高而增加,从而在测试频率范围内出现第一峰值频率。虽然梯度结构的高温吸声性能变差,但是较单层材料的吸声性能要好得多。因此,FeCrAl纤维多孔材料梯度结构是一种适用于多种特殊环境的吸声体。According to the system research of the sound absorption performance of FeCrAl fibrous porous materials, the porous materials structure were optimization design, and the order of arrangement of the gradient structure was degressive in porosity. The sound absorption performance of monolayer and gradient structure were test respectively. The results showed that sound absorption performance in low frequency of three layer gradient structure compared with monolayer had improved obviously in the normal temperature and normal sound press, and the steady absorption coefficient could extended smoothly, the maximum was 1. The steady sound absorption performance of the structure also kept preferably under high sound intensity in 140dB and normal temperature, the absorption coefficient were more than 0.9 in wide frequency range between 1600-6400Hz. The sound absorption performance of gradient structure had slightly decreased because of the effects from temperature, and the absorption coefficient did not increase with the increasing of the frequency, so the first peak frequency formed in test frequency range. The sound absorption performance in high temperature of gradient structure became poor, but it better than monolayer materials. Therefore, FeCrAl fibrous porous materials gradient structure is a sound absorber which suitable for many special environment.

关 键 词：梯度结构 FECRAL 纤维多孔材料 吸声性能 

分 类 号：TB34[一般工业技术—材料科学与工程]