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对比研究了2种内应变水平和晶粒大小不同的Fe粉在微加工过程中的形貌演变和微波电磁性能的变化规律.结果表明,与羰基Fe粉相比,表面粗糙度和内应变水平较大,晶粒较小的自制Fe粉在形状控制剂的协助下,经10 h的微加工就能得到大而薄的片状Fe粉;延长微加工时间(t)至12 h,存在的高内应变使片状结构破碎,宽度减小;进一步延长至t=24 h,Fe粉继续变薄,制备出宽厚比较大、宽度较小的片状Fe粉.该片状Fe粉同时具有高的磁导率和较低的介电常数,用其组成的环氧树脂基复合材料在体积分数为20%,厚度为1.5 mm时反射率小于-10 dB的带宽为8.2 GHz,最低反射率为-14.6 dB.
The morphologies and microwave electromagnetic properties of two Fe powders with different internal strain levels and grain sizes were compared and studied.The results showed that the surface roughness and internal strain level Larger, smaller grains of self-made Fe powder shape control agent with the help of 10h micro-processing can be large and thin flaky Fe powder; extended micro-processing time (t) to 12 h, the existence of The high internal strain causes the sheet structure to be broken and the width decreases, and further prolonging the time until t = 24 h, the Fe powder continues to be thinned to prepare flaky Fe powder with a large thickness and a small width. Of the permeability and low dielectric constant of epoxy resin matrix composites composed of its volume fraction of 20% at a thickness of 1.5 mm reflectivity less than -10 dB bandwidth of 8.2 GHz, the lowest reflectivity -14.6 dB.