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在结构陶瓷材料中加入一定量的磁性颗粒分散相,从而使复合材料具有一定的电磁学性能,是结构陶瓷多功能化的一个重要途径。制备了一系列不同体积比的3 mol%YSZ/MnZn铁氧体复合材料(铁氧体含量分别为0 vol%,20vol%,40 vol%,50 vol%,60 vol%,80 vol%和100 vol%),测定了复合材料在1 MHz~1 GHz频率范围内的复磁导率,研究了磁性相体积比对复合材料电磁性能的影响。结果表明,复合材料的磁导率在磁性相体积比超过0.6时,会出现大幅度的升高,即发生磁逾渗现象,逾渗阈值约为0.6。
In the structure of ceramic materials by adding a certain amount of magnetic particles dispersed phase, so that the composite has a certain electromagnetic properties, structural ceramics is an important way of multi-functional. A series of 3 mol% YSZ / MnZn ferrite composites with ferrite content of 0 vol%, 20 vol%, 40 vol%, 50 vol%, 60 vol%, 80 vol% and 100 vol%). The complex permeability of the composites was measured in the frequency range from 1 MHz to 1 GHz. The effect of the volume fraction of magnetic phase on the electromagnetic properties of the composites was investigated. The results show that the magnetic permeability of the composites increases sharply when the magnetic phase volume ratio exceeds 0.6, that is, the magnetic percolation phenomenon occurs and the percolation threshold is about 0.6.