【作者】 高润生； 甄良； 邵文柱； 吕良星； 孙学银； 徐仁根；

【Author】 GAO Run-sheng, ZHEN Liang, SHAO Wen-zhu, Lu Liang-xing, SUN Xue-yin, XU Ren-geng (Department of Materials Science, Harbin Institute of Technology, Harbin 150001, China)

【机构】 哈尔滨工业大学材料学院；

【摘要】 对Fe-Cr-Co合金在高温条件下的磁稳定性进行了研究。稳定性试验结果表明,(BH)max的不可逆变化率为Br和Hc的2-5倍,材料的磁性能,特别是(BH)max在开始阶段有一定的波动,随时间延长波动逐渐减小,经过稳定化处理的试样其稳定性有一定的改善。以单畴粒子理论为基础,讨论了各因素对磁性能的影响。透射电镜观察表明,合金的显微组织结构在稳定性试验前后没有发生明显的变化。穆斯堡尔谱分析发现,经过高温稳定性试验后,合金中的铁磁性成分不仅强度有所增大,而且所占比例也有提高,同时顺磁相强度减小、所占比例降低,造成了合金磁性能的提高;并分析认为,合金磁性能的变化是由于合金中Cr原子的继续扩散和分布引起al和a2两相成分变化造成的。更多还原

【Abstract】 Magnetic stability of a Fe-Cr-Co permanent magnet material at high temperatures has been studied. The result of stability experiment indicated that the irreversible changes of (BH)max of alloy were 2 to 5 times larger than that of Br and Hc, and the changes of magnetic properties of the Fe-Cr-Co alloy tend to decrease, and then gradually keeps a certain level with increasing the holding time at high temperature. The stability of samples that treated by stable treatment has improved at high temperature. TEM observations show that microstructures of the alloy do not change distinctly after high temperature holding. Mossbauer spectroscopic analyses find that the rising of strength and proportion of ferromagnetic components, and reduction of those of paramagnetic components lead to the improvement of magnetic properties after high temperature holding. This study attributes the change of magnetic properties to element redistribution of Cr.更多还原