无机填料对功能弹性体吸声性能的影响

基于调节聚氨酯/环氧树脂(PUR/EP)弹性体基材声阻抗,增加材料对声能弛豫吸收和传播路径、加大声波损耗的目的,在基材中加入空心玻璃微珠和云母两种无机材料,并通过改变无机材料的添加量和梯度结构设计对其水声吸声性能展开了研究。研究结果表明:无机填料云母和空心微珠的加入均能有效改善PUR/EP基材的吸声性能。空心微珠量越多,吸声效果越佳。云母添加量的影响规律为5%含量时平均吸声系数高,而高云母含量则只能对基材的低频吸声性能的提高贡献较大。这两种无机填料的梯度分层复合材料的吸声性能要优于非梯度材料(总含量10%)。

Effect of Inorganic Fillers on Underwater Acoustic erformance of Functional Elastomers

Two kinds of inorganic materials :hollow glass beads and the mica were added to polyurethane/epoxy (PUR/EP) elastomer substrate for the purpose of increasing the acoustic absorption and propagation path,adjustment of the acoustic impedance,and increasing the acoustic loss. Its underwater acoustic absorption performance was studied by changing the amount of inorganic materials and gradient structure design. The results show that inorganic fillers such as mica and hollow glass microspheres can effectively improve the underwater acoustic absorption properties of the PUR/EP blend matrix. The more of the contents of hollow glass microspheres,the better the acoustic absorption of the blends. The average absorption coefficient is high when the amounts content of mica is 5%,high mica content can only give larger contribution to the low-frequency acoustic absorption properties of the matrix. The acoustic absorption properties of gradient layered composites by these two inorganic filler is superior to the non-gradient materials (10% of the total content).