摘要
利用粉末冶金方法研制了Sm(Co_(Lal)Fe_(0.24)Cu_(0.08)Zr_(0.027))_(7.0),Sm(Co_(Lal)Fe_(0.27)Cu_(0.05)Zr_(0.027))_(7.0),Sm(Co_(Lal)Fe_(0.26)Cu_(0.05)Zr_(0.026))_(7.0)3种高温永磁,并对其磁性能、温度稳定性和显微结构进行了分析.结果表明:样品Sm(Co_(Lal)Fe_(0.27)Cu_(0.05)Zr_(0.027))_(7.0)具有最高的内禀矫顽力(2165.6kA·m^(-1))和最大磁能积(212.0kA·m^(-3));3种磁体的温度系数都较低,最高使用温度均在400℃以上,大大高于一般商用磁体;增加Sm,Co,Cu的含量和减少Fe的含量可以提高材料的温度稳定性.X射线分析表明,合金中含有Sm_2(Co,Fe)_(17)主相,Sm(Co,Cu)_5相,含Zr化合物等.Sm(Co,Cu)_5相、单质Zr、晶粒边界等钉扎畴壁,使合金具有较高的矫顽力.
Three high temperature magnets, including Sm(Co_(bal) Fe_(0. 24) Cu_(0. 08) Zr_(0. 027))_(7. 0), Sm (Co_(bal) Fe_(0. 27) Cu_(0. 06)Zr_(0. 027))_(7. 0) and Sm (Co_(bal) Fe_(0. 26) Cu_(0. 05) Zr_(0. 026))_(7. 0), were produced by power metallurgy techniques. Themagnetic properties, temperature stability and microstructure were analyzed in this paper. The resultsshow that Sm (Co_(bal) Fe_(0. 27) Cu_(0. 05) Zr_(0. 027))_(7. 0) has the highest intrinsic coeroivity of 2 165. 6 kA· m^(-1), themaximum energy product of 212. 0 kA· m^(-3). The three alloys have low temperature coefficient of coercivi-ty, and the maximum operating temperature of the three magnets all over 400 ℃, which is greatly higherthan that of the commercial Sm_2 Co_(17) alloys. Thermal stability can be improved by applying higher Sm,Co, Cu content and lower Fe content. Through the analysis of microstructure, It can be found that thereexist Sm_2 (Co, Fe)_'(17) main phase, Sm (Co, Cu )_5 Phase, Zr-rich compound and Zr in the alloys.Sm(Co, Cu)_5, Zr and cell boundary may pin the domain wall, so as to improve the coeroivity.
出处
《粉末冶金材料科学与工程》
EI
2001年第3期186-191,共6页
Materials Science and Engineering of Powder Metallurgy
关键词
高温永磁
磁性能
温度系数
high temperature permanent magnets
magnetic properties
temperature coefficient
