多孔金属纤维烧结毡单向拉伸行为

摘要

基于多齿刀具切削及高温固相烧结铜纤维技术制备具有三维网状结构的多孔金属纤维烧结毡(PMFSS)。通过单向拉伸试验研究纤维长度及自然时效处理对 PMFSS 拉伸性能的影响。结果表明：增大纤维长度有利于提高PMFSS的拉伸强度；选用15 mm中等纤维长度有利于PMFSS获得最优的伸长率，可达到13.5%。经1个月的自然时效处理后，PMFSS的拉伸强度都出现明显下降，但除5 mm短纤维PMFSS的伸长率明显提高，其他PMFSS伸长率基本保持不变。同时，还对PMFSS的断裂形式进行表征与分析。%A novel porous metal fiber sintered sheet (PMFSS) with a three-dimensional reticulated structure was fabricated by multi-tooth cutting and high-temperature solid-phase sintering process with copper fibers. A uniaxial tensile test was conducted to investigate the effect of fiber length and natural aging factor on the tensile properties of the PMFSS. Results indicated that, under given stress, the increase of fiber length helped reinforce the tensile strength. The elongation of the PMFSS with medium length fiber of 15 mm exhibited the optimal performance, reaching about 13.5%. After natural aging treatment for a month, the tensile strength of PMFSS significantly decreased, but the change of elongation was negligible except for the one with the shortest fiber length of 5 mm, whose elongation was effectively improved. The morphological fracture features of PMFSSs were also characterized.