渗氮对SmFeN合金粉末吸波性能的影响  

Impact of Nitriding on Microstructure and Wave-absorbing Properties of SmFeN Alloy Powders

作　　者：董宇航 刘春忠 张洪宁 卢天倪 李娜 黄震威 马驰野 DONG Yuhang;LIU Chunzhong;ZHANG Hongning;LU Tianni;LI Na;HUANG Zhenwei;MA Chiye(Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136

出　　处：《材料研究学报》2024年第10期751-758,共8页Chinese Journal of Materials Research

基　　金：稀土资源利用国家重点实验室开放课题(RERU2022-019);辽宁省应用基础研究计划(2023JH2/101300235)。

摘　　要：对SmFeN粉末渗氮,研究了渗氮对其吸波性能的影响。结果表明:渗氮能提高SmFeN合金的N含量,使合金中氮化物的结构向Fe_(3)N、Fe_(2)N转变,从而提高其吸波性能。渗氮使SmFeN的反射损耗大幅度增强(最小反射损耗值为-52.49 dB),使有效吸收频宽变宽并向低频移动,在10.4~14.7 GHz频段有效吸收频宽的最大值为4.3 GHz。SmFeN has received a lot of attention in recent years because of its exceptional wave-absorbing characteristics.Herein,nitro-SmFeN alloy powders were prepared by gas nitriding at 550℃ for 2 h and 3 h.Then the effect of nitriding treatment on their microstructure and electromagnetic parameters(including the dielectric real partε′,the dielectric imaginary partε″,the permeability real partμ′and the permeability imaginary partμ″),attenuation constants,and impedance matching,as well as the influence on wave-absorbing properties were studied in detail.The findings indicate that the N content of SmFeN alloy powders can be increased due to the nitriding treatment,as a subsequence the the nitride structure of SmFeN is changed to Fe_(3)N and Fe_(2)N,therewith its wave absorbing performance is enhanced.Following nitriding,SmFeN's reflectivity value is significantly increased(with a minimum reflection loss value of-52.49 dB).Additionally,the effective absorption bandwidth is widened and moved to a lower frequency,with a maximum value of 4.3 GHz in the 10.4~14.7 GHz frequency range.The study's findings offer a useful concept for the ensuing relevant applications.

关 键 词：金属材料 SMFEN 渗氮 吸波性能 介电损耗 阻抗匹配 

分 类 号：TB34[一般工业技术—材料科学与工程]