(桂林電子科技大學(xué) 廣西信息材料重點(diǎn)實(shí)驗(yàn)室，桂林 541004)
摘 要: 采用高能球磨及熱處理方法制備Nd11.76Fe82.36B5.88和Nd11.76Fe77.36Cr5B5.88粉體，借助X射線衍射儀和矢量網(wǎng)絡(luò)分析研究磁場(chǎng)熱處理對(duì)粉體組織結(jié)構(gòu)和微波吸收特性的影響。結(jié)果發(fā)現(xiàn)：在熱處理過(guò)程中，加入磁場(chǎng)可以促進(jìn)Nd11.76Fe82.36B5.88粉體各鐵磁性相和非鐵磁性相的晶粒長(zhǎng)大，使Nd11.76Fe82.36B5.88粉體反射率的最小值從普通熱處理粉體的−14 dB降低到−24.3 dB，Nd11.76Fe77.36Cr5B5.88粉體的反射率最小值從普通熱處理粉體的−30.5 dB降低到−48 dB；磁場(chǎng)熱處理使Nd11.76Fe82.36B5.88和Nd11.76Fe77.36Cr5B5.88粉體的吸波帶變窄，且在微波損耗過(guò)程中，磁損耗作用增大，而介電損耗作用減弱。
關(guān)鍵字: 磁場(chǎng)熱處理；吸波材料；反射率；高能球磨
（Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China）
Abstract:The Nd11.76Fe82.36B5.88 and Nd11.76Fe77.36Cr5B5.88 powders were prepared by the h, igh-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.
Key words: magnetic heat treatment; absorbing material; reflectivity; high energy ball milling
