不同尺寸的NdFeB稀土永磁体热退磁行为研究  

Thermal Demagnetization Behavior of NdFeB Rare Earth Permanent Magnet with Different Dimensions

作　　者：甄良[1,2] 易忠 杨丽[2] 孟立飞 姜利祥 邵文柱[2] 

机构地区：[1]可靠性与环境工程技术国防科技重点实验室,北京100094 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《中国稀土学报》2013年第1期26-30,共5页Journal of the Chinese Society of Rare Earths

基　　金：可靠性与环境工程国防科技重点实验室开放基金(KHZS-2011-3-KFJJ004);国家自然科学基金(50671031)资助

摘　　要：针对不同类型及不同尺寸的两类NdFeB永磁体分别研究了它们随温度变化的热退磁行为。采用样品的整体剩余磁通来表征热退磁过程中磁体性能的变化。结果表明,Pc较小的永磁体温度稳定性较差,随温度的升高,样品的剩余磁通迅速衰减;Pc<<0.1的普通型永磁体,温度为100℃时样品的剩余磁通损失超过60%。高矫顽力型永磁体比普通型磁体具有更优越的温度稳定性和高温性能。温度升高主要导致磁体矫顽力降低,140℃时普通型磁体的矫顽力降低约80%,而高矫顽力型磁体的矫顽力只降低了约20%。The thermal demagnetization behaviors of two types of NdFeB magnets with different dimensions were investigated.The magnetic properties changes of magnets were characterized by magnetic flux loss of the sample during thermal demagnetization.The results revealed that the temperature stability of magnets with lower Pc value was poor and its magnetic flux decreased rapidly with temperature increase.The magnetic flux loss for ordinary magnet was more than 60% at 100 ℃.The high coercivity NdFeB magnet than ordinary magnets had superior temperature stability and high temperature performance.The temperature increase led to coercivity decrease.The coercivity of ordinary magnet decreased about 80% at 140 ℃,and of high coercivity magnets did about 20%.

关 键 词：NdFeB稀土永磁体 热退磁 尺寸效应 温度稳定性 

分 类 号：TM273[一般工业技术—材料科学与工程]