铁硼又称钕铁硼磁体(NdFeB磁体),是由钕、铁、硼(Nd2Fe14B)形成的四方晶体。钕磁铁是1982年由半岛综合体育官方登录住友特殊金属公司的佐川正人发现的。这种磁体的磁能积(BHmax)大于钐钴磁体,是当时世界上磁能积最大的材料。后来,住友特种金属成功开发了粉末冶金工艺。通用汽车公司成功开发了熔融纺丝工艺,可以制备钕铁硼磁体。半岛综合体育官方登录这种磁铁是目前可用的磁性最强的永磁体,也是最常用的稀土磁铁。钕铁硼磁体在半岛综合体育官方登录室温下可以使用很长时间,但众所周知,当暴露在高温下时,它们会退磁。钕铁硼磁体的成本和性能的结合使其成为传统磁体和新产品应用的流行选择,在现有强度急剧增加的情况下,可半岛综合体育官方登录以使用更小的磁体,这对大多数设计都有利。在高温下处理钕铁硼磁体时应注意,因为钕铁硼磁体在高温下容易退磁。半岛综合体育官方登录下面我们就和大家一起来了解一下钕铁硼磁体的高温退磁问题。半岛综合体育官方登录 Due to the high content of NdFeB in NdFeB magnets, they are also easy to oxidize, so various coatings that meet these conditions depend on the operating environment of NdFeB magnets. The reason why NdFeB will demagnetize in high temperature environment is determined by its own physical structure. The reason why a general magnet can generate a magnetic field is because the electrons carried by the substance itself rotate around the atom in accordance with the direction, thereby generating a magnetic field force, which in turn affects the surrounding related affairs. However, the rotation of electrons around atoms in a predetermined direction is also limited by temperature conditions. Different magnetic materials can withstand different temperatures. If the temperature is too high, electrons will deviate from the original orbit, causing confusion. The local magnetic field of the material will be disrupted, resulting in demagnetization. The temperature resistance of powerful NdFeB magnets is about 200 degrees, that is, if it exceeds 200 degrees, demagnetization will occur. If the temperature is higher, the demagnetization will be more serious.
几种有效解决钕铁硼磁体高温退磁的方法:半岛综合体育官方登录
1.不要将钕铁硼磁铁产品置于过高的温度下,尤其要注意其临界温度,即200度,并及时调整其工作环境温度,尽量减少退磁的发生。
二是从技术入手,提高使用铁硼磁体的产品性能,使其具有更高的温度结构,不容易受环境影响。半岛综合体育官方登录
3.也可以选择具有相同磁能积的高矫顽力材料。如果不能,你只能牺牲一点磁能积,用更低的磁能积找到更高矫顽力的材料。如果没有,可以选择使用钐钴。对于可逆退磁,钐钴是唯一的选择。
前一:磁性材料工业的发展前景