纳米晶SmN/α-Fe及SmO/α-Fe复合材料的吸波特性

Electromagnetic Wave Absorption Properties of Nano-Crystalline SmN/α-Fe and SmO/α-Fe Composite

摘要:

通过SmFe合金的氢化-歧化（HD）后并结合低温氮化或氧化法制备出了纳米晶SmN/α-Fe及SmO/α-Fe双相复合电磁波吸收材料。研究表明：在0.5~18 GHz的频率范围内，SmN/α-Fe双相复合电磁波吸收材料介电常数的实部和虚部都比SmO/α-Fe的高，而复磁导率却略低于SmO/α-Fe，两者磁导率虚部μr″均出现两个峰，并且在较宽频带范围内保持较高值；但因SmO/α-Fe双相复合电磁波吸收材料的磁导率和介电常数两者匹配性优于SmN/α-Fe，因而具有更好的电磁波吸收性能，其RL＜–20 dB的频段为3.3~10.65 GHz，匹配厚度为1.6~3.95 mm，在4.8 GHz，RL达到最小值–50 dB，匹配厚度为2.92 mm。

Abstract:

Nano-crystalline SmN/α-Fe and SmO/α-Fe double phase composite with electromagnetic (EM) wave absorption property was prepared by hydrogenization and dehydrogenization followed by nitrogenation and oxidation treatment. The results show that the measured real part and imaginary part of dielectric constant for SmN/α-Fe are higher than that for SmO/α-Fe, but the complex EM permeability of SmO/α-Fe is higher than that of SmN/α-Fe, their imaginary parts of the relative permeability μ″ exhibit two resonant peaks and high values over the 0.5~18 GHz range. Because the match between the permeability and the dielectric constant for SmO/α-Fe is better than that for SmN/α-Fe, therefore the former has better EM wave absorption property and its RL (reflection loss) is less than –20 dB with absorber match thickness of 1.60~3.95 mm in the frequency range of 3.30~10.65 GHz. The minimum RL is –50 dB, absorber match thickness is 2.92 mm at 4.8 GHz.