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CHENGDU HEAVEN AND GREAT TECHNOLOGY CO.,LTD.

Magnetic Materials

Country/Region china
Company CHENGDU HEAVEN AND GREAT TECHNOLOGY CO.,LTD.
Categories Magnetic Materials
Update 2019-03-02 07:55:09
ICP License Issued by the Chinese Ministry
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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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