学术
摘 要:
分别研究了以聚四氟乙烯（PTFE）和环氧树脂（Epoxy resin）为粘结剂的各向异性粘结NdFeCoB取向成形后经不同次数的交流脉冲退磁后的表面剩磁Br,以及上述磁体再经过热退磁后的表面剩磁Br。发现两种磁体即使经过多次交流退磁也并不能将其完全退磁,因此必须对其进行热退磁。研究了热退磁对两种磁体的表面剩磁的影响,同时重点研究了热退磁温度和保温时间对以PTFE为粘结剂的各向异性粘结NdFe-CoB的表面剩磁和矫顽力的影响。结果表明,在370℃保温10min,既可以保证退磁效果,又不至于引起磁体更多的热磁损失。[著者文摘]
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文章出处:
《粉末冶金技术》-2008年26卷1期 -37-40页
栏目信息:
Influence of demagnetization process on the effect of demagnetization of anisotropic bonded NdFeCoB magnets
Zhang Tao, Sun Aizhi, Yao Xiunan （ School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:
The surface renmanence of anisotropic bonded NdFeCoB magnets with PTFE or Epoxy resin binder have been investigated, respectively. Both of them were demagnetized for different times by alternating current pulse applied field. Then two sorts of magnets were demagnetized by heat treatment. It is found that alternating current pulse demagnetization could not achieve ideal effect, so thermal demagnetization is necessary. Then the effect of thermal demagnetization was studied, particularly, temperature and time of thermal demagnetization and their effects on superficial remnant and coercivity of anisotropic PTFE bonded NdFeCoB. The result show that demagnetization at 370℃ for 10 minutes, not only reduces superficial remnant to ideal level, but also makes the thermo-magnetic loss the least.[著者文摘]
Key words:
thermal demagnetization; alternating current pulse demagnetization; surface remanence; coercivity; anisotropic bonded NdFeCoB
基金资助:
国家高技术研究发展计划新材料领域资助项目（2001AA324016）
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