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孔结构是影响金属纤维多孔材料各项性能的关键因素之一,为此研究了孔结构对其性能的影响规律。采用气流铺毡法和烧结技术制备了Fe Cr Al纤维多孔材料,利用SEM观察其微观组织,同时测试了其拉伸强度、透气性和吸声系数(声强为90~140 d B,频率为1000~3000 Hz)。利用自主研发的分形软件计算了孔结构的分形维数。另外,研究了孔结构对多孔材料拉伸强度、吸声系数和透气性的影响规律,建立了拉伸强度、透气性与分形维数之间的本构关系。研究表明,随着分形维数的增加,抗拉伸强度呈线性下降,而透气性显著增大;在相同的声强和频率下,吸声系数随着分形维数的增加而逐渐降低。
The pore structure is one of the key factors that affect the properties of porous metal fiber materials. Therefore, the influence of pore structure on its properties has been studied. The Fe Cr Al fiber porous material was prepared by air-flow method and sintering technique. The microstructure of the Fe-Cr Al fiber was observed by SEM. The tensile strength, air permeability and sound absorption coefficient (sound intensity 90 ~ 140 d B, 1000 to 3000 Hz). The fractal dimension of pore structure was calculated by the self-developed fractal software. In addition, the influence of pore structure on the tensile strength, sound absorption coefficient and air permeability of porous materials was studied, and the constitutive relation between tensile strength, air permeability and fractal dimension was established. The results show that with the increase of fractal dimension, the tensile strength decreases linearly and the gas permeability increases obviously. Under the same sound intensity and frequency, the sound absorption coefficient decreases with the increase of fractal dimension.