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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 (M_s). 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 (T_c: 700-850 C), middle high maximum energy product ((BH)_max: 110-260 kJ/m³), low temperature coefficients of remanence ((B_r): +0.01 to -0.05 %/°C) and coercivity ((H_cj): -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.

With over a decade’s experience and state-of-the-art technologies, CHENGDU HEAVEN AND GREAT TECHNOLOGY CO.,LTD (HGT) is one of the best in the field of manufacturing and developing permanent magnets. HGT provides high quality neodymium iron boron (NdFeB) magnets, samarium cobalt (SmCo) magnets, ceramic/ferrite magnets, AlNiCo magnets and their magnetic assemblies to meet global customers’ requirements with on-time delivery and professional service.

ADVANCED MAGNETS^TM, the flagship brand of HGT, focuses on the series of rare earth permanent magnets (REPMs) including NdFeB and SmCo magnets. The REPMs have the highest maximum energy product (BH)_max which provide feasible solutions to smaller dimension and/or higher performance devices and equipments so as to improve the social efficiency with the benefits of faster speed, stronger power and less consumption and pollution. As the REPMs' applications become broader and deeper, HGT plays a more and more important role in the global process of greener and smarter future.