LaFe_(11.6)Si_(1.4)/10%Co复合材料的磁热效应  

Magnetocaloric Effect of Fe_(11.6)Si_(1.4)/10%Co Composite Material

作　　者：高磊 程娟[1] 李兆杰[1] 钟喜春[2] 刘翠兰[1] Gao Lei;Cheng Juan;Li Zhaojie;Zhong Xichun;Liu Cuilan(State Key Laboratory of Baiyun Obo Rare Earth Resource Research and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510000,China)

机构地区：[1]白云鄂博稀土资源研究与综合利用国家重点实验室,包头稀土研究院,内蒙古包头014030 [2]华南理工大学材料科学与工程学院,广东广州510000

出　　处：《中国稀土学报》2023年第6期1078-1083,I0002,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然基金项目(52066001);广州市科技计划项目(201904010030)资助。

摘　　要：利用SPS(放电等离子烧结)技术制备了La Fe_(11.6)Si_(1.4)/10%Co复合材料,结合XRD,OM和Versa Lab等手段,系统地研究了La Fe_(11.6)Si_(1.4)/10%Co复合材料的相组成、微观结构和磁热性能。不同烧结温度制备的铸态La Fe_(11.6)Si_(1.4)/10%Co复合材料由1∶13相、α-Fe相和Co相组成,烧结温度的提高促进了主相(1∶13相)的分解,恶化复合材料的磁热性能。OM测试结果表明,烧结温度的提高有利于孔隙尺寸的减小,提高铸态La Fe_(11.6)Si_(1.4)/10%Co复合材料的致密度。923 K烧结的铸态La Fe_(11.6)Si_(1.4)/10%Co复合材料的居里温度T_C为199.8 K,0~2 T磁场范围的最大等温磁熵变为3.02 J·kg^(-1)·K^(-1),RC值为40.6 J·kg^(-1),并表现出二级磁相变的特点,具有良好的磁热性能。Fe_(11.6)Si_(1.4)/10%Co composite material was prepared by SPS(spark plasma sintering)technology.Combined with the means of XRD,OM and Versa Lab,the phase composition,microstructure and magnetocaloric properties of Fe_(11.6)Si_(1.4)/10%Co composite material were studied.The as-cast Fe_(11.6)Si_(1.4)/10%Co composite material prepared at different sintering temperatures is composed of 1∶13 phase,α-Fe phase and Co.The decomposition of 1∶13 phase is promoted by increasing the sintering temperature,and the magnetocaloric properties is deterioated.The results show that the increase of sintering temperature is beneficial to the density.The Curie temperature TC of the as-cast composite material sintered at 923 K is 199.8 K,the maximum isothermal magnetic entropy in 0-2 T is 3.02 J∙kg^(-1)∙K^(-1),and the RC is 40.6 J∙kg^(-1).Moreover,the composite material shows the characteristics of second-order magnetic phase transformation and has good magnetocaloric properties.

关 键 词：复合材料 微观结构 磁热性能 磁相变 稀土 

分 类 号：TB64[一般工业技术—制冷工程]