Effect of annealing temperature on coercivity of Nd-Fe-B magnets with TbFeAl doping by process of hot-pressing

doi:10.1088/1674-1056/ab7b57

Abstract The Nd-Fe-B magnets are pre-sintered and then processed with hot-pressing, and the resulting magnets are called the hot-pressed pretreated (HPP) magnets. The coercivity of the HPP magnets increases as the annealed temperature increases. When the annealing temperature is 900℃, the coercivity of the magnet is only 17.6 kOe (1 Oe=79.5775 A·m^-1), but when the annealing temperature rises up to 1060℃, the coercivity of the magnet reaches 23.53 kOe, which is remarkably increased by 33.7%. The microstructure analysis indicates that the grain surface of the HPP magnet becomes smoother as the annealed temperature increases. The microstructure factor α is changed according to the intrinsic coercivity model formula. The α of the magnet at 900℃ is only 0.578, but it is 0.825 at 1060℃. Microstructural optimization is due mainly to the increase of coercivity of the HPP magnet.

Keywords: hot-pressed coercivity microstructure anisotropy field

Received: 09 January 2020
Revised: 26 January 2020
Accepted manuscript online:

PACS:	75.60.Nt	(Magnetic annealing and temperature-hysteresis effects)
	75.50.Ww	(Permanent magnets)
	75.50.Vv	(High coercivity materials)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: Project supported by the Major Project of “Science and Technology Innovation 2025” in Ningbo City, China (Grant Nos. 2018B10086 and 2018B10017).

Corresponding Authors: Bo Zheng, Shuai Guo
E-mail: zhengbo@nimte.ac.cn;gshuai@nimte.ac.cn

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Ze-Teng Shu(舒泽腾), Bo Zheng(郑波), Guang-Fei Ding(丁广飞), Shi-Cong Liao(廖是聪), Jing-Hui Di(邸敬慧), Shuai Guo(郭帅), Ren-Jie Chen(陈仁杰), A-Ru Yan(闫阿儒), Lei Shi(石磊) Effect of annealing temperature on coercivity of Nd-Fe-B magnets with TbFeAl doping by process of hot-pressing 2020 Chin. Phys. B 29 057501

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Effect of annealing temperature on coercivity of Nd-Fe-B magnets with TbFeAl doping by process of hot-pressing

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