Development of Rare-Earth・Iron・Boron system exchange coupling type bonded magnet materials with high quality heat-resistant.

采用单辊快淬法制备了Didymium-Fe-B系和Pr-Fe-B系合金快淬薄带。研究了合金成分、磁轮转速和热处理工艺对磁性能的影响。并对用这些薄带制备的粘结磁体的一些性能进行了测试。在Didymium-Fe-B合金系中，在17.5 m/s的轮速下制备的Didymium_<12.5>Fe_<68>Co_<10>Nb_1 V_1 Tb_<0.5>B_7快淬薄带经热处理后晶化。最佳热处理条件为600℃保温5 min，（BH）_<max>和H_<cJ>值分别为103.6 kJ/m^3、1628.0 kA/m。在25 ~ 125℃范围内，晶化薄带的J_r和H_r的温度系数<cJ>分别为α（J_r）<ave>=-0.03%/℃（可逆）和α（H_<cJ>）=-0.37%/℃（不可逆）。采用模压法制备了Didymium_<12.5>Fe_<68>Co_<10>Nb_1V_1Tb_<0.5>B_7各向同性粘结磁体， ...更多信息 用600℃退火5 min的薄带进行强化，（BH）_<max>达到66.2kJ/m^3。密度为6.32 Mg/m^3。在Pr-Fe-B系合金中，采用单辊液态快淬法制备了Pr_xFe_<91.5-x-y-z>Co_yTi_<1.5>B_zSi_<0.5>（x = 10.0 $&gt; 13.0，y = 8.0 $&gt; 12.0，z=7.0 $&gt; 14.0）合金快淬薄带，研究了成分、辊速和退火条件对合金磁性能的影响。最佳制备工艺条件为：成分为Pr_<11>Fe_<68.5>Co_8 Ti_<1.5>B_<10.5>Si_<0.5>，轮速为10.0 m/s，退火条件为650℃，Ar气氛下退火0 min，磁性能J_r=0.8 T（，H_<cJ>=1570 kA/m，H_<cB>= 550 kA/m，H_（BH）_<max>= 111.2 kJ/m^3，H_k/H_<cJ>×100 = 24.9%，α（J_r）=-0.04%/℃，α（H_<cJ>）=-0.37%/℃，Tc = 403℃。由TEM观察，发现该带的平均粒径为约23 nm。采用600℃退火5 min的Pr_<11>Fe_<68.5>Co_8 Ti_<1.5>B_<10.5>Si_2<0.5>薄带制备了压缩成型各向同性粘结磁体，其磁性能分别为：J_r = 0.60 T（6.0 kG），H_<cJ>= 1530 kA/m，H_<cB>= 420 kA/m，（BH）_<max>=66.8 kJ/m^3。Pr_<11>Fe_<66.5>Co_<10>Ti_<1.5>B_<10.5>Si_2<0.5>和Pr_<11>Fe_<64.5>Co_<12>Ti_<1.5>B_<10.5>Si_2<0.5>粘结磁体在150℃时的不可逆损耗小于MQP-O粘结磁体。少

The melt-spun ribbons of Didymium-Fe-B and Pr-Fe-B system alloys were prepared by single roller rapid-quenching method. The effects of composition, wheel velocity and heat-treatment on the magnetic properties were investigated. And some properties of bonded magnets prepared by using these ribbons were examined. The sunmnaly of the experimental results is following.In Didymium-Fe-B alloy system, the melt-spun ribbons of Didymium_<12.5>Fe_<68>Co_<10>Nb_1V_1Tb_<0.5>B_7 prepared at a wheel velocity of 17.5 m/s were crystallized by heat treatment. The optimum heat treatment condition was found to be at 600℃ for 5 min. The values of (BH)_<max> and H_<cJ> amount to 103.6 kJ/m^3, 1628.0 kA/m, respectively. The temperature coefficients of J_r and H_<cJ> for the crystallized ribbons were α (J_r)_<ave>=-0.03 %/℃(reversible) and α (H_<cJ>)=-0.37 %/℃(irreversible) for the temperature range 25 to 125℃. The compression molded Didymium_<12.5>Fe_<68> Co_<10>Nb_1V_1Tb_<0.5>B_7 isotropic bonded magnet, p … More repared by using the ribbons annealed at 600℃ for 5 min, achieve the (BH)_<max> of 66.2 kJ/m^3. The density amount to 6.32 Mg/m^3. At 150℃ irreversible losses of -2.50 % result.In Pr-Fe-B system alloys, melt-spun ribbons of Pr_xFe_<91.5-x-y-z>Co_yTi_<1.5>B_zSi_<0.5> (x = 10.0〜13.0, y = 8.0〜12.0, z=7.0〜14.0) alloys were prepared by the single roller liquid rapid-quenching method, and the effects of composition, wheel velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows : composition : Pr_<11>Fe_<68.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5> ; wheel velocity : 10.0 m/s and annealing condition : 650℃ for 0 min in Ar atmosphere ; magnetic properties J_r=0.8 T (, H_<cJ>=1570 kA/m, H_<cB> = 550 kA/m, (BH)_<max> = 111.2 kJ/m^3, H_k/H_<cJ>×100 = 24.9%, α(J_r) =-0.04%/℃, α (H_<cJ>)=-0.37%/℃ and T_c = 403℃. From a TEM observation, the average particle size of this ribbon was found to be about 23 nm. The compression molding isotropic bonded magnets were prepared by using Pr_<11>Fe_<68.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5> ribbons annealed at 600℃ for 5 min. The magnetic properties of this bonded magnet were J_r = 0.60 T (6.0 kG), H_<cJ> = 1530 kA/m, H_<cB> = 420 kA/m and (BH)_<max>=66.8 kJ/m^3. The irreversible losses of Pr_<11>Fe_<66.5>Co_<10>Ti_<1.5>B_<10.5>Si_<0.5> and Pr_<11>Fe_<64.5>Co_<12>Ti_<1.5>B_<10.5>Si_<0.5> bonded magnets were smaller than that of MQP-O one at 150℃. Less