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.482 北京科技大学学报 第29卷 明显，永磁体一直保持很好的性能；氧含量大于 pendence of coercivity in rare earth cobalt magnets.J Magn Magn 0.32%后，磁性能开始明显下降，但是(BH)max仍然 Mter.2002.242/245:1335 [5]Liu J F,Ding Y,Zhang Y,et al.New rare earth permanent mag" 在160kJm-3以上；而氧含量大于0.4%，磁性能急 nets with an intrinsic coercivity of 10kOe at 550C.J Appl Phys, 剧恶化；达到0.7%后，磁性能几乎消失 1999,85(8):5660 (3)随着氧含量增加，Sm的氧化物Sm203增 [6]曲选辉，颜寒松，黄伯云·金属粉末注射成形粘结剂的发展. 多，晶粒尺寸变小，晶界处的白色析出物增多， 粉末冶金技术.1997,15(1)：61 (4)氧对矫顽力H。的影响，主要体现在有效 [7]Kronmller H.Groll D.Micromagnetic theory of the pinning of domain walls at phase boundaries.Phys B.2002,319:122 Sm含量的变化；氧对B.和(BH)mr的影响体现在 [8]Liu JF.Zhang Y.Dimitrov D.et al.Microstructure and high tem- 非磁性相体积分数B的增加，随着氧含量增加， perature magnetic properties of Sm(Co,Cu.Fe.Zr):(-6.7~ Sm2O3增多，B值加大，B.和(BH)max减小. 9.1)permanent magnets.J Appl Phys.1999.85(5):2800 [9]Sam L.Potts G.Doyle G.et al.Effect of value on high tempera- 参考文献 ture performance of Sm(Co.Fe,Cu.Zr):with ==7.14~-8.10. [1]Tang W.Zhang Y,Hadjipanayis G C.et al.Microstructure and IEEE Trans Magn.2000.36(5):3297 magnetic properties of Sm (Com Fe,Cuo.12 Zro.)7.0.J Magn [10]Zhang Y.Corte-Real M.Hadjipanayis GC.et al.Magnetic hard- ag-Mater,2000(221):268 ening studies in sintered Sm(Co.Cu Fe.Zr):2:17 high tem- [2]田建车，陶斯武，张深根，等.Sm2(CoCuFeZr)17永磁材料的研 perature magnets.J Appl Phys.2000.87(9):6722 究现状及展望.材料导报，2005,19(4)：89 [11]Schobinger D.Gutfleisch O.Hinz D,et al.High temperature [3]Walmer M S.Chen C H.A new class of Sm-TM magnets for op- magnetic properties of 2:17 Sm-Co magnets.J Magn Magn erating temperatures up to 550 degrees Celsius.IEEE Trans Mater,2002,242/245,1347 agn,2000,36(5).3376 [12]周寿增，稀土永磁材料及其应用，北京：冶金工业出版社， [4]Tang W.Zhang Y,Gabay A M,et al.Anomalous temperature de- 1995:15 Effects of oxygen on the microstructure and magnetic properties of Sm(Co,Fe, Cu,Zr):permanent magnets TIA N Jianjun,ZHA NG Shengen,Qu Xuanhui,TAO Siwu,CUI Dawei Materials Science and Engineering School,University of Science and Technology Beijing.Beijing 100083.China ABSTRACI The effects of oxygen on the magnetic properties of Sm(Co,Fe,Cu,Zr):permanent magnets were studied.SEM,EDS and TEM approaches were used to analyze the microstructure of the permanent mag nets.The factors that affect the magnetic properties were discussed.The results indicate that the magnetic prop- erties remain excellent and are not affected when the oxygen content is less than 0.32 in mass fraction.The magnetic properties begin to decrease when the oxygen content is between 0.32%and 0.4.evidently deterio- rate when the oxygen content is above 0.4%,and almost vanish when the oxygen content is more than 0.7. The particle size of the magnets decreases while more Sm203 begins to separate from the magnets gradually.The main factors that affect the magnetic properties are the increase of non magnetism phase and the decrease of the useful Sm content of the magnets. KEY WORDS permanent magnets;magnetic properties;oxidation;microstructure;samarium oxide明显永磁体一直保持很好的性能；氧含量大于 0∙32％后磁性能开始明显下降但是（ BH）max仍然 在160kJ·m —3以上；而氧含量大于0∙4％磁性能急 剧恶化；达到0∙7％后磁性能几乎消失． （3） 随着氧含量增加Sm 的氧化物 Sm2O3 增 多晶粒尺寸变小晶界处的白色析出物增多． （4） 氧对矫顽力 Hcj的影响主要体现在有效 Sm 含量的变化；氧对 Br 和（ BH）max的影响体现在 非磁性相体积分数 β的增加随着氧含量增加 Sm2O3 增多β值加大Br 和（BH）max减小． 参 考 文 献 ［1］ Tang WZhang YHadjipanayis G Cet al．Microstructure and magnetic properties of Sm （Cobal Fe x Cu0∙128 Zr0∙02）7∙0．J Magn Magn Mater2000（221）：268 ［2］ 田建军陶斯武张深根等．Sm2（CoCuFeZr）17永磁材料的研 究现状及展望．材料导报200519（4）：89 ［3］ Walmer M SChen C H．A new class of Sm-T M magnets for operating temperatures up to 550 degrees Celsius．IEEE Trans Magn200036（5）：3376 ［4］ Tang WZhang YGabay A Met al．Anomalous temperature dependence of coercivity in rare earth cobalt magnets．J Magn Magn Mater2002242／245：1335 ［5］ Liu J FDing YZhang Yet al．New rare-earth permanent magnets with an intrinsic coercivity of10kOe at550℃．J Appl Phys 199985（8）：5660 ［6］ 曲选辉颜寒松黄伯云．金属粉末注射成形粘结剂的发展． 粉末冶金技术199715（1）：61 ［7］ Kronmüller HGroll D．Micromagnetic theory of the pinning of domain walls at phase boundaries．Phys B2002319：122 ［8］ Liu J FZhang YDimitrov Det al．Microstructure and high temperature magnetic properties of Sm（CoCuFeZr） z（ z ＝6∙7～ 9∙1） permanent magnets．J Appl Phys199985（5）：2800 ［9］ Sam LPotts GDoyle Get al．Effect of z value on high temperature performance of Sm（CoFeCuZr） z with z ＝7∙14～8∙10． IEEE Trans Magn200036（5）：3297 ［10］ Zhang YCorte-Real MHadjipanayis G Cet al．Magnetic hardening studies in sintered Sm（CoCu xFeZr） z2∶17high temperature magnets．J Appl Phys200087（9）：6722 ［11］ Schobinger DGutfleisch OHinz Det al．High temperature magnetic properties of 2∶17 Sm—Co magnets．J Magn Magn Mater2002242／245：1347 ［12］ 周寿增．稀土永磁材料及其应用．北京：冶金工业出版社 1995：15 Effects of oxygen on the microstructure and magnetic properties of Sm （CoFe CuZr）z permanent magnets TIA N JianjunZHA NG ShengenQu XuanhuiTAO Siw uCUI Dawei Materials Science and Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China ABSTRACT The effects of oxygen on the magnetic properties of Sm （CoFeCuZr）z permanent magnets were studied．SEMEDS and TEM approaches were used to analyze the microstructure of the permanent magnets．The factors that affect the magnetic properties were discussed．The results indicate that the magnetic properties remain excellent and are not affected when the oxygen content is less than0∙32％ in mass fraction．The magnetic properties begin to decrease when the oxygen content is between0∙32％ and0∙4％evidently deteriorate when the oxygen content is above0∙4％and almost vanish when the oxygen content is more than0∙7％． The particle size of the magnets decreases while more Sm2O3begins to separate from the magnets gradually．The main factors that affect the magnetic properties are the increase of non-magnetism phase and the decrease of the useful Sm content of the magnets． KEY WORDS permanent magnets；magnetic properties；oxidation；microstructure；samarium oxide ·482· 北 京 科 技 大 学 学 报 第29卷