钕磁铁的温度特性探究及其应用装置的设计  

作　　者：叶萍[1] 宋雨田 刘沄涛 杨逸舟 苏波[1] 

机构地区：[1]首都师范大学物理系,北京100048

出　　处：《科技创新与应用》2021年第24期40-42,共3页Technology Innovation and Application

基　　金：国家自然科学基金项目(编号:61575131)。

摘　　要：钕磁铁是目前为止具有最强磁力的人造永久磁铁,被广泛应用于电子产品上。文章主要探究了钕磁铁的温度特性,并比较了不同尺寸钕磁铁随温度变化的磁性变化率。通过实验发现钕磁铁的磁性随温度的升高逐渐减小;且当钕磁铁温度变化量不大时,尺寸越小的钕磁铁变化率越大,对温度的变化较为敏感。温度变化较大时,尺寸大的钕磁铁变化率高于尺寸小的钕磁铁。基于钕磁铁的磁热效应,利用其制作了电路保护开关装置。该装置可用于高温下工作的器件,当温度过高时,实现自动断开。另外,该开关具有自动充磁功能,从而使其能够重复使用。Neodymium magnet is the most powerful artificial permanent magnet,which is widely used in electronic products.In this paper,the magnetic properties of neodymium magnet with different temperature are studied.It is found that the magnetism of neodymium magnet decreases with the increase of temperature;and when the temperature of neodymium magnet changes little,the smaller the size of neodymium magnet is,the greater the change rate of neodymium magnet is,and it is more sensitive to its temperature change.When the temperature changes greatly,the change rate of large size neodymium magnet is higher than that of small size neodymium magnet.Based on the magnetocaloric effect of neodymium magnet,a circuit protection switch device was made.The device can be used for devices working at high temperature,when the temperature is too high,it can automatically disconnect.In addition,the switch has automatic magnetization function,so that it can be reused.

关 键 词：钕磁铁 温度 电路保护开关 

分 类 号：TM273[一般工业技术—材料科学与工程]