磁场热处理对磁性吸波材料微波吸收特性的影响  

Effect of magnetic heat treatment on microwave absorbing properties of magnetic absorbing material

作　　者：林培豪[1] 潘顺康[1] 王磊[1] 周怀营[1] 杨涛[1] 

机构地区：[1]f桂林电子科技大学广西信息材料重点实验室,桂林541004

出　　处：《中国有色金属学报》2012年第4期1113-1118,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50961005);广西信息材料重点实验室主任基金资助项目(桂科能0710908-12-Z);广西自然科学基金资助项目(0991002Z)

摘　　要：采用高能球磨及热处理方法制备Nd11.76Fe82.36B5.88和Nd11.76Fe77.36Cr5B5.88粉体,借助X射线衍射仪和矢量网络分析研究磁场热处理对粉体组织结构和微波吸收特性的影响。结果发现:在热处理过程中,加入磁场可以促进Nd11.76Fe82.36B5.88粉体各铁磁性相和非铁磁性相的晶粒长大,使Nd11.76Fe82.36B5.88粉体反射率的最小值从普通热处理粉体的-14 dB降低到-24.3 dB,Nd11.76Fe77.36Cr5B5.88粉体的反射率最小值从普通热处理粉体的-30.5 dB降低到-48 dB;磁场热处理使Nd11.76Fe82.36B5.88和Nd11.76Fe77.36Cr5B5.88粉体的吸波带变窄,且在微波损耗过程中,磁损耗作用增大,而介电损耗作用减弱。The Nd11.76Fe82.36B5.88 and Nd11.76Fe77.36Cr5B5.88 powders were prepared by the high-energy ball milling and following heat treatment.By the aid of X-ray diffraction and vector network analysis,the effects of the magnetic heat treatment on the powder structure and microwave absorbing properties were researched.The results show that applying magnetic field in the heat treatment process can promote the growth of ferromagnetic phase and non-ferromagnetic phase grain in Nd11.76Fe82.36B5.88 powder,the minimum reflectivity of Nd11.76Fe82.36B5.88 powder drops from the ordinary heat-treated -14 dB to -24.3 dB.The minimum reflectivity of Nd11.76Fe77.36Cr5B5.88 powder drops from the ordinary heat-treated -30.5 dB to -48 dB.The magnetic heat treatment of Nd11.76Fe82.36B5.88 and Nd11.76Fe77.36Cr5B5.88 powder will narrow the microwave absorbing bandwidth,and in the microwave loss process,the magnetic loss will increase,while the dielectric loss will decrease.

关 键 词：磁场热处理 吸波材料 反射率 高能球磨 

分 类 号：TG132.2[一般工业技术—材料科学与工程]