Optimizing temperature coefficient of Sm_(2)Co_(17)-type magnets through adjusting the isothermal aging process  

作　　者：Chao Wang Die Hu Qiangfeng Li Yikun Fang Meng Zheng Lei Wang Hongsheng Chen Lei Zhao Haizhou Wang Minggang Zhu Wei Li 

机构地区：[1]Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing,100081,China [2]Shanghai Aerospace Control Technology Institute,Shanghai,201109,China [3]Beijing Advanced Innovation Center for Materials Genome Engineering,Central Iron and Steel Research Institute,Beijing,100081,China [4]Beijing Key Laboratory of Metal Materials Characterization,Central Iron and Steel Research Institute,Beijing,100081,China

出　　处：《Journal of Rare Earths》2024年第11期2097-2104,I0004,共9页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (2021YFB3503100,2022YFB3505303,2021YFB3501500);the Key Technology Research and Development Program of Shandong Province (2019JZZY020210)。

摘　　要：The high-temperature magnetic perfo rmance and micro structure of Sm_(1-x)Gd_(x)(Co_(bal)Fe_(0.09)Cu_(0.09)Zr_(0.025))_(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℃,β_(25-500℃),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 Sm_(5)Co_(19) 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 temperature range from 25 to 500℃ for Gd-substituted Sm_(2)Co_(17)-type magnets.

关 键 词：Rare earths Sm_(2)Co_(17)-type magnets Isothermal aging process Temperature coefficient of intrinsic coercivity 

分 类 号：TM273[一般工业技术—材料科学与工程]