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    Magnetic Materials

    Home >> Magnetic Materials >> Sintered SmCo Magnets

    Sintered SmCo magnets, i.e. sintered samarium cobalt magnets, are those permanent magnetic materials that based on a hexagonal crystal structure (1:5 type SmCo magnets) or a rhombohedral crystal structure (2:17 type SmCo magnets), and they are manufactured through a powder metallurgy process. They contain two basic elements samarium and cobalt. The samarium element can be substituted by a portion of other rare earth elements including praseodymium (Pr), cerium (Ce), gadolinium (Gd), erbium (Er), etc. The cobalt element can be substituted by a portion of iron (Fe) element to increase the magnets’ saturation magnetization (Ms). In order to control the microstructure and the microchemistry so as to meet required performance, it is also critical to add a small portion of copper (Cu), zirconium (Zr), titanium (Ti), etc.

    According to crystal structure, samarium cobalt magnets include SmCo5 magnets (1st generation of REPMs) and Sm2Co17 magnets (2nd generation of REPMs). They were invented/developed by K. Strnat’s team in the 1960s and T. Ojima’s team in the 1970s, respectively. Due to their high Curie temperature (Tc: 700-850 C), middle high maximum energy product ((BH)max: 110-260 kJ/m3), low temperature coefficients of remanence ((Br): +0.01 to -0.05 %/°C) and coercivity ((Hcj): -0.2 to -0.3 %/°C) and high corrosion resistance, sintered SmCo magnets are mainly applied in high temperature motors, servo motors, stepper/stepping motors, traveling wave tubes (TWTs), circulators, isolators, klystrons, undulators, gyroscopes, accelerometers, instruments and meters, etc.

    >> Sintered SmCo Magnets’ Grades and Their Magnetic Properties

    GradeBrHcbHcj(BH)maxTw
    kGsTkOekA/mkOekA/mMGOekJ/m3C
    XGS32H11.0-11.51.10-1.15≥10.2≥812≥25≥199030-32239-255≤350
    XGS30H10.7-11.21.07-1.12≥9.9≥78828-30223-239
    XGS28H10.4-10.91.04-1.09≥9.6≥76426-28207-223
    XGS26H10.0-10.51.00-1.05≥9.2≥73224-26191-207
    XGS24H9.7-10.20.97-1.02≥8.9≥70822-24175-191
    XGS22H9.3-9.80.93-0.98≥8.5≥67620-22159-175
    XGS20H9.0-9.50.90-0.95≥8.2≥65318-20143-159
    XGS3211.0-11.51.10-1.15≥10.0≥796≥18≥143330-32239-255≤300
    XGS3010.7-11.21.07-1.12≥9.7≥77228-30223-239
    XGS2810.4-10.91.04-1.09≥9.4≥74826-28207-223
    XGS2610.0-10.51.00-1.05≥9.0≥71624-26191-207
    XGS249.7-10.20.97-1.02≥8.7≥69222-24175-191
    XGS229.3-9.80.93-0.98≥8.3≥66020-22159-175
    XGS209.0-9.50.90-0.95≥8.0≥63718-20143-159
    XGS32M11.0-11.51.10-1.15≥9.0≥716≥12≥95530-32239-255≤300
    XGS30M10.7-11.21.07-1.12≥8.7≥69228-30223-239
    XGS28M10.4-10.91.04-1.09≥8.5≥67626-28207-223
    XGS26M10.0-10.51.00-1.05≥8.5≥67624-26191-207
    XGS24M9.7-10.20.97-1.02≥8.5≥67622-24175-191
    XGS22M9.3-9.80.93-0.98≥8.2≥65320
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