金属纤维多孔材料孔结构对其性能的影响（英文）

Effect of Pore Structure on Performance of Porous Metal Fiber Materials

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 of porous metal fiber materials is a key factor affecting their performances, so the effects of the pore structure on the performances were analyzed in the paper. Using Fe Cr Al fiber as starting materials, porous metal materials were prepared by an air flow method and sintering process. The microstructures of sintered samples were observed by a scanning electron microscope（SEM）. The tensile strength and air permeability were also tested. The sound absorption coefficients at 90-140 d B with different frequencies from 1000-3000 Hz were measured. In addition, the fractal dimension of the pore structure was calculated by self-developed software which was based on the fractal theory and computer image processing technology. The effects of pore structure on the tensile strength, the sound absorption coefficient and the air permeability were discussed, and the relationships among the tensile strength, the air permeability and the fractal dimension were described. Results show that the tensile strength decreases linearly with the fractal dimension increasing, while the air permeability increases obviously. Additionally, the sound absorption coefficient declines gradually with the fractal dimension increasing at the same sound intensity or frequency.