N48型正畸钕铁硼永磁体的性能测试  

Mechanical properties of N48 type orthodontic NdFeB magnet

作　　者：侯志明[1] 薛明[1] 代昕[1] 艾红军[1] 姚戈[2] 温井龙[2] 

机构地区：[1]沈阳中国医科大学口腔医学院正畸科,110002 [2]中国科学院沈阳金属研究所疲劳实验室

出　　处：《实用口腔医学杂志》2005年第3期406-408,共3页Journal of Practical Stomatology

基　　金：辽宁省教育厅项目

摘　　要：目的:对与托槽大小相近的N48磁体进行磁性能及力学测试.方法:将N48钕铁硼切割为2 mm×3 mm×4 mm大小的磁块,测量剩余磁通密度、矫顽力、最大磁能积;测量磁体表面及周围磁场强度;使用Tytron250型万能材料实验机测定两充磁磁块0～10 mm之间吸引力与排斥力的变化.结果:N48钕铁硼的剩余磁通密度为1.37 T,矫顽力为1 037 A/m,最大磁能积为368 kJ/m3.磁体表面场强为0.338 T,距离达到7 mm时降为0.01 T.最大吸引力4.47 N,0～5 mm范围内吸引力为4.47～0.39 N.最大排斥力为2.82 N,0～5 mm范围内为2.82～0.35 N.结论:N48磁体的性能已经达到临床矫治力的需要.Objective: To test the mechanical properties o f N48 NdFeB magnet.Methods:Samples of N48 NdFeB magnet in the size of 2 mm×3 mm×4 mm were prepared, the residual flux density,coercive force and maximum energy product of the samples were measured, the magnetic density aroun d the magnets,the attractive and repulsive force between two magnets in 0~10 mm air gap were investegated.Results:The residual flux density of t he N48 NdFeB magnet was 1.373 T, coercive force 1 037 A/m and maximum energ y product 368 kJ/m 3.The magnetic density at magnet surface was 0.338 T,it decr eased to 0 at the point that leave magnet surface 20 mm away. The highest attrac tive force was 4.47 N between two magnets, the attractive force was 4.47~0.39 N in 0~5 mm air gap.The highest repulsive force was 2.82 N and the repulsive force was 2.82~0.39 N in 0~5 mm air gap.Conclusion:The magnetic and m echanical properties of the N48 NdFeB magnet can meet the standard of the orthod ontic force.

关 键 词：钕铁硼永磁体 口腔正畸 矫治力 

分 类 号：R783.5[医药卫生—口腔医学]