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研究了取代元素钴、镝、钬、铒、钆等对Nd-Fe-B系永磁合金磁性及热稳定性的影响。用钻和重稀土元素取代铁和钕,合金居里温度升高,磁感总损失下降,平均可逆温度系数下降最后变为正值。已得到一种温度系数α=-0.028％/℃(20～100℃)的Nd Fe B系永磁合金,它可以较好地工作在150℃的环境中。用这种取代方法获得的温度系数为零的合金,其磁性为:Br=7900G,_iH_c>16kOe,_bH_c=7.3kOe,(BH)_(max)=14.3MGOe。
The effects of elemental cobalt, dysprosium, holmium, erbium and gadolinium on the magnetic and thermal stability of Nd-Fe-B permanent magnet alloys were studied. Replacing iron and neodymium with diamond and heavy rare earth elements, the Curie temperature of the alloy increases, the total loss of magnetic induction decreases, and the average reversible temperature coefficient declines to a positive value. A NdFeB based permanent magnet alloy having a temperature coefficient α = -0.028% / ° C (20 to 100 ° C) has been obtained, which can work well at 150 ° C. The alloys with zero temperature coefficient obtained by this substitution method have the following magnetic properties: Br = 7900G, _iH_c> 16kOe, _bH_c = 7.3kOe, (BH) _ (max) = 14.3MGOe.