采用硅橡胶(110型)与金属(镍粉)按质量比为1:2.7进行配料,应用室温二次固同化合成Ni/硅橡胶压敏复合材料样品.室温下测量了样品的压阻效应,比较了外加0.024 T磁场前后样品的介电性质.结果表明,当压强从3.75 kPa到312.5 kPa时,样品直流电阻率下降了 8个数量级.与加磁场前相比,0.024 T的磁场使得低频(40～104Hz)交流电导率提高了2.46倍,介电常数提高了20%,介电损耗提高了2倍,这主要是由复合材料中铁磁-绝缘体-铁磁颗粒膜的隧道磁电阻效应以及磁电耦合引起的.撤去磁场后交流电导率、介电常数和介电损耗均不能回到加磁场前的初始值,这与Ni粉的铁磁性有关.Ni/硅橡胶压敏复合材料的压阻、磁电阻效应及磁电耦合等物理性质在磁传感器件、信息储存等领域有潜在的应用价值.
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