【摘要】 以十三氟辛基三乙氧基硅烷(FAS)为硅源，采用水解缩合法对片状FeSiAl吸收剂粒子进行表面接枝包覆，对片状FeSiAl粒子表面包覆前后的微观结构、包覆层成分、静磁性能和电磁性能进行了表征。结果表明：FAS成功地接枝在片状FeSiAl粒子表面形成薄层致密包覆层，包覆后的粒子仍保持较好的软磁性能。由于包覆层的电绝缘及低极化特性，吸收剂的介电常数可降低40%,而磁导率不受影响，从而使材料的阻抗匹配显著提升。当FAS的质量分数为3%,吸收剂的填充质量分数为76%的复合材料是3 mm厚度时，其反射损耗RL小于-3 dB时的吸收带宽从1.206 GHz (0.147～1.353 GHz)增加到1.922 GHz (0.147～2.069 GHz),最小损耗强度从-14.64 dB提升至-16.90 dB。更多还原

【Abstract】 Triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane(FAS) was proposed to be grafted on the surface of flaky FeSiAl absorbents by a hydroly-tic condensation method. The microstructure, coating composition, static magnetic and electromagnetic properties of flaky FeSiAl absorbents before and after surface coating were characterized. The results showed that the hydrolyzed FAS were successfully grafted on the surface of flaky FeSiAl particles to form a thin and uniform coating, and coated particles still have good soft magnetic properties. Due to the electrical insulation and low polarization properties of the coated layer, the complex permeability of flaky FeSiAl absorbents was nearly unchanged by the coating while complex permittivity was reduced by 40%, which substantially improved the impedance matching of the microwave absorbing materials. When the composite material with a mass fraction of 3% FAS and a mass fraction of absorbent filler of 76% was 3 mm thick, the absorption bandwidth whose reflection loss RL was less than-3 dB increased from 1.206 GHz(0.147—1.353 GHz) to 1.922 GHz(0.147—2.069 GHz), the minimum loss intensity increased from-14.64 dB to-16.90 dB.更多还原