激光局部氮化改善取向硅钢磁畴结构分布

Development About the Distribution of the Domain Structure of Oriented Silicon Steel by Local Laser Nitridation

采用激光氮化方法 (LN方法 )对取向硅钢表面进行局域线状氮化处理 ,引入气态氮作为合金化元素 ,研究了激光工艺参数对硅钢表面氮化物形成的影响·对传统观察磁畴的方法进行了改进 ,研制了一种新型的Fe3 O4磁流体 ,这种磁流体不仅能进行适时观察磁畴结构 ,而且还实现了带膜磁畴观察·利用XPS方法及Fe3 O4磁流体磁畴观测方法对处理后的样品进行了检测及磁畴观察·结果表明 :通过控制激光工艺参数可实现取向硅钢的激光氮化 ,在取向硅钢表面生成了Fe4N和Fe3 N两种氮化物 ;氮化处理后 ,硅钢片的磁畴结构有所细化 ,从而可以改善取向硅钢的性能 ,降低取向硅钢的铁损 ;氮化样品经 6 0 0℃ ,3h保温时效退火处理后 ,磁畴结构基本保持不变 ,这说明氮化处理可以使取向硅钢的高温时效性有所改善·

Local nitridation treatment was achieved on the surface of grain oriented silicon steel by laser local nitridation method. Nitrogen was introduced to be the alloying element. The relationships between laser parameters and the formation of Fe N alloy on the surface of silicon steel was studied. Traditional domain investigation method was modified. A new type of Fe 3O 4 magnetic fluid was prepared. With this modified method, domain investigation with film was realized. The prepared samples were analyzed by XPS method and domain investigation was realized with Fe 3O 4 magnetic fluid. The laser local nitridation can be realized by controlling laser parameters. Two types of ferrite nitrides ie. Fe 4N and Fe 3N are formed on the surface of grain oriented silicon steel. Domain structure of silicon steel is confined, therefore the property of grain oriented silicon steel can be improved and the core loss can be decreased too. After annealing at 600?℃ for 3 hours, domain structure of nitrided sample changes a little. The property of ageing is developed after the nitridation treatment.