首页|Optimizing temperature coefficient of Sm2Co17-type magnets through adjusting the isothermal aging process
Optimizing temperature coefficient of Sm2Co17-type magnets through adjusting the isothermal aging process
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The high-temperature magnetic performance and microstructure of Sm1-xGdx(CobalFe0.09Cu0.09Zr0.025)7.2(x=0.3,0.5)magnets were investigated.With the isothermal aging time decreasing from 11 to 3 h,the temperature coefficient of intrinsic coercivity in the temperature range of 25-500 ℃,β25-500 c,was optimized from-0.167％/℃ to-0.112％/℃ for x=0.3 magnets.The noticeable enhancement(～33％)of temperature stability is correlated with the increased content of 1∶5H cell boundary phase and its relatively high Curie temperature as well.However,for the x=0.5 magnet,it is found that the presence of Sm5Co19 phases and wider nanotwin variants hinder the formation of 1∶5H cell boundary phase.The insufficient 1∶5H is not beneficial to the proper redistribution of Cu in cell boundary,making the x=0.5 magnet difficult to achieve higher temperature stability.Consequently,the approach of adjusting the isothermal aging process can offer guidance for attaining superior magnetic performance in the tem-perature range from 25 to 500 ℃ for Gd-substituted Sm2Co17-type magnets.
Rare earthsSm2Co17-type magnetsIsothermal aging processTemperature coefficient of intrinsiccoercivity
Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing,100081,China
Shanghai Aerospace Control Technology Institute,Shanghai,201109,China
Beijing Advanced Innovation Center for Materials Genome Engineering,Central Iron and Steel Research Institute,Beijing,100081,China
Beijing Key Laboratory of Metal Materials Characterization,Central Iron and Steel Research Institute,Beijing,100081,China
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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaKey Technology Research and Development Program of Shandong Province
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