论文部分内容阅读
Nd—Fe—B系永磁材料具有优异的永磁特性,但是它的致命弱点:居里温度低,温度稳定性差限制了该材料的推广应用。为此1984年3月冶金部军工办和稀土办下达了研究“高性能低温度系数Nd—Fe—B永磁材料”的课题。经过一年多的工作已完成了此项研究任务。 1.在Nd—Fe—B合金基础上,用Co部分地取代Fe可提高居里温度,每增10at％的Co合金,居里温度提高约80～100℃。降低合金的磁感可逆温度系数,随Co含量增加磁感可逆温度系数下降,当o30％时,可由Nd—Fe—B合金的-0.126％/℃降至-0.05％/C。再添加少量Al的提高矫顽力,可获得综合性能好的Nd—Co—Fe—Al—B五元合金,其
Nd-Fe-B permanent magnet material with excellent permanent magnet properties, but its fatal weakness: the Curie temperature is low, poor temperature stability limits the promotion of the material. Therefore, in March 1984, the Ministry of Metallurgy Military Office and Rare Earth Office issued the research topic of “high performance and low temperature coefficient Nd-Fe-B permanent magnet materials”. After more than a year of work has completed the research task. 1. On the basis of Nd-Fe-B alloy, partial substitution of Fe with Co can increase the Curie temperature, and the Curie temperature increases about 80-100 ℃ for every 10at% Co alloy. The reversible temperature coefficient of the magnetic susceptibility of the alloy is decreased, and the reversible temperature coefficient of the magnetic susceptibility decreases with the increase of the Co content. When the temperature is 30%, the temperature coefficient of the Nd-Fe-B alloy can be decreased from -0.126% / ℃ to -0.05% / C. Adding a small amount of Al to improve the coercive force, it is possible to obtain the Nd-Co-Fe-Al-B five-element alloy with good overall properties,