邓联文
,
刘秀丽
,
周克省
,
黄生祥
,
赵新闻
,
黄伯云
功能材料
采用气体雾化和高能球磨处理工艺并结合SrCO3复合改性技术制备FeSiAlCr薄片状微波吸收剂材料;利用X射线衍射仪和扫描电镜分析观测试样的微观结构和形貌;使用矢量网络分析仪测量系统测量样品在2～18GHz频率范围的复介电常数和复磁导率;计算模拟了FeSiAlCr吸收剂和经纳米SrCO3复合改性的SrCO3/FeSiAlCr吸收剂构成的单层吸波材料的吸波性能.结果表明,气体雾化工艺结合高能球磨处理技术可以获得纳米晶结构和薄片状形貌的FeSiAlCr材料,通过纳米SrCO3复合改性处理还能有效降低材料的介电常数,改善微波电磁参量的匹配性能;SrCO3/FeSiAlCr复合改性材料具有良好的吸波性能,厚度为1.2mm的吸波涂层在2～6GHz范围的反射系数均低于-5dB.
关键词:
FeSiAlCr合金
,
纳米SrCO3
,
复合改性
,
微波吸收
Tingdong ZHOU
金属学报(英文版)
FeSiAlCr alloy powders were prepared by mechanical alloying, the milling time were 20 h, 40 h, 60 h and 80~h, respectively. Powders morphology was studied by SEM. Microstructure of powders milled for various times were analyzed by XRD. The complex permittivity and complex permeability of four powders were tested in the frequency range from 0.5 to 18 GHz, and their microwave absorption properties were analyzed. It was found that the particle size of powders milled for 80~h was less than 2μm. Silicon and aluminum atoms were dissolved into the crystal lattice of iron, and chromium atoms can form alloy with iron atoms. The minimum peak value of reflectivity can reach to -11.3 dB at the frequency of 4.3 GHz for 80 h milling powders, and the other one was -6 dB at 16.5 GHz.
关键词:
FeSiAlCr alloy
,
固溶体
,
电磁参数
,
反射率
,
机械合金化
