采用电爆炸技术,合成了粒径约为70 nm的Ni纳米颗粒,以3-巯基丙基三甲氧基硅烷偶联剂(MPTS)对Ni颗粒进行表面改性,利用共沉淀法对改性Ni颗粒进行包覆得到核-壳结构的复合纳米颗粒.将获得的复合纳米颗粒作为微波吸收剂,并以不同比例分散到热固性酚醛树脂中,涂刷在200 mm×200 mm的金属板上,用RAM反射率远场RCS测量法研究了微波吸收特性.研究表明,核-壳结构Fe3O4/Ni复合颗粒作为微波吸收剂,在相同质量比条件下,其微波吸收性能明显优于纯Ni纳米颗粒或Fe3O4纳米颗粒的情况,并且在Fe3O4/Ni核-壳结构复合纳米颗粒中随着镍含量的提高,微波吸收增强,而随着Fe3O4含量的增加,微波吸收频段向高频段移动.
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