Fixed-point control of temperature stability of samarium cobalt based permanent magnets by rare earth gadolinium
The fixed-point control of rare earth gadolinium on the temperature stability of samarium cobalt(Sm-Co)based permanent magnets was explored.By adjusting the Gd content,the effect of Gd on the magnetic temperature stability of Sm1-xGdx(CobalFe0.1Cu0.08Zr0.026)7.2(x=0.44-0.50)magnet was systematically studied.Experimental re-sults show that with the increase of Gd content,the remanence Br and the maximum energy product(BH)m de-crease,while the absolute value of the remanence temperature coefficient a decreases,indicating that magnets with high Gd content exhibit reduced sensitivity to temperature changes in the range of 293-373 K.Moreover,the tem-perature corresponding to the maximum magnetic moment increases,demonstrating that magnets with high Gd con-tent display more stable magnetic properties in high-temperature regions.Microstructural analysis reveals that in-creased Gd content leads to a reduction in grain size and an increase in cell phase size,as well as enrichment of Cu at the cell boundaries.The research results provide a scientific basis for the fixed-point regulation of temperature sta-bility of Sm-Co based permanent magnets.
Sm-Co magnetrare earth gadoliniummagnetic propertiesremanence temperature coefficientmicro-structure
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