永磁材料的发展 A (2=y) 480 60 Development of permanent magnets 400 50 Steel Nd2Fe14B 320 40 稀土永磁 240 Sm2Co17 30 (Sm,Pr)Cos Sm2Fe17N3 K6Jau 160 Ba,Sr-Ferrite Sintered SmCos 20 FeCrCo wnwlxew Co,Ferrite 80 MK AInico MnAl 10 KS NKS wnwlxeW Steel 0 0 1900 1920 1940 1960 1980 2000 2020 Year Ferrite In the last 100 years,the strength of the magnets [(BH)max and H]increased by a Alnico factor of 100. Sm-Co Nd-Fe-B 学与工程学院 9 School or Materals Science and Engineering材料科学与工程学院 School of Materials Science and Engineering 稀土永磁 永磁材料的发展 In the last 100 years, the strength of the magnets [(BH)max and Hc ] increased by a factor of 100. 9