Thermal expansion behavior of sintered Nd–Fe–B magnets with different Co contents and orientations  

作　　者：孟睿阳 徐吉元 张家滕 刘静 方以坤 董生智 李卫 Rui-Yang Meng;Ji-Yuan Xu;Jia-Teng Zhang;Jing Liu;Yi-Kun Fang;Sheng-Zhi Dong;Wei Li(Division of Functional Material,Central Iron&Steel Research Institute,Beijing 100081,China)

机构地区：[1]Division of Functional Material,Central Iron&Steel Research Institute,Beijing 100081,China

出　　处：《Chinese Physics B》2023年第5期573-579,共7页中国物理B（英文版）

基　　金：the National Key Research and Development Program of China (Grant No. 2021YFB3502900);the National Natural Science Foundation of China (Grant No. 51871063);the Key Technology Research and Development Program of Shandong Province, China (Grant No. 2019JZZY020210);the Major Projects in Inner Mongolia Autonomous Region, China。

摘　　要：The thermal expansion behavior of sintered Nd–Fe–B magnets is a crucial parameter for production and application.However, this aspect has not been thoroughly investigated. In this study, three different sintered Nd–Fe–B magnets with varying Co content(Co = 0, 6, 12 wt%) were prepared using the conventional powder metallurgy method, and four magnets oriented under different magnetic fields were prepared to compare. The thermal expansion behavior for the magnets was investigated using a linear thermal dilatometry in the temperature range of 20℃–500℃. It was found that, the coefficient of thermal expansion(CTE) increases with the increase of Co contents, while the anisotropy of thermal expansion decreases.The introduction of Co leads to continuous changes from negative to positive thermal expansion in the vertically oriented direction, which is important for the development of zero thermal expansion magnets. The thermal expansion of nonoriented magnets was found to be isotropic. Additionally, the anisotropy of thermal expansion increases with the increase of orientation degree. These results have important implications for the development of sintered Nd–Fe–B with controllable CTE.

关 键 词：thermal expansion sintered Nd–Fe–B magnets ORIENTATION Co content 

分 类 号：TM273[一般工业技术—材料科学与工程]