超薄金属纤维复合膜材料的低频吸声性能  

Lower Frequency Sound Absorption Properties of Ultra-thin Metal Fiber Complex Film Materials

作　　者：敖庆波[1] 王建忠[1] 马军[1] 李烨[1] 吴琛 汤慧萍[1] Ao Qingbo;Wang Jianzhong;Ma Jun;Li Ye;Wu Chen;Tang Huiping(State Key Laboratory of Porous Metals Materials,Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

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：《稀有金属材料与工程》2020年第11期3861-3864,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51701164);陕西省科技新星项目(2018KJXX-060)。

摘　　要：针对限域空间(≤5mm)噪声防护对超薄吸声结构的重大需求,以不锈钢纤维毡为原料,利用低温烧结技术制备了由不锈钢纤维多孔材料和金属薄膜组成的复合膜材料。利用B&K声学测试平台对复合膜材料进行频率范围在50~1000Hz之间吸声系数的测试,分析了结构参数对复合膜材料吸声性能的影响规律。分别通过研究金属纤维多孔材料的孔结构(孔径、丝径、烧结结点)及金属薄膜的层数对复合膜材料吸声性能的影响规律。结果表明,在频率为50~1000Hz的范围内,超薄复合膜材料的最优结构为金属纤维多孔材料按照细丝径、小孔面向声源,粗丝径、大孔在后的顺序排列,材料内部复合铜箔可有效提高材料在低频处的吸声性能。Focusing on the exigent requirement of ultra-thin sound absorption structure in the limited space for noise treatment,using stainless steel fiber felt as the raw material,the film materials composed of stainless steel fiber porous material and metal film were prepared by low temperature sintering technology.The sound absorption coefficient of complex film materials was tested by B&K acoustic test platform in the frequency range from 50 to 1000 Hz,and the effect of structural parameters on the sound absorption performance of complex film materials was analyzed.The effects of pore structure of metal fiber porous materials(pore diameter,wire diameter,sintering node)and the number of metal film layers on the sound absorption performance of complex film materials were studied.Results show that in the frequency range of 50 to 1000 Hz,the optimal structure of ultra-thin complex film materials is based on the order of the porous metal fiber material that fine wire diameter,small pore faces to sound source,while thick wire diameter and large pore is in the back.Complex copper-film inside the materials can effectively improve the sound absorption performance at low frequency.

关 键 词：金属纤维 复合结构 吸声性能 金属薄膜 低频 

分 类 号：TF125.6[冶金工程—粉末冶金]