AN APPROACH TO PREPARING NdFeB POWDER WITH HIGH COERCIVITY

Acta Metall Sin

1992, Vol. 28

Issue (8): 91-94 DOI:

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AN APPROACH TO PREPARING NdFeB POWDER WITH HIGH COERCIVITY

XIAO Yaofu; ZHANG Zhengyi; TANG Weizhong (University of Science and Technology Beijing)

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XIAO Yaofu; ZHANG Zhengyi; TANG Weizhong (University of Science and Technology Beijing). AN APPROACH TO PREPARING NdFeB POWDER WITH HIGH COERCIVITY. Acta Metall Sin, 1992, 28(8): 91-94.

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Abstract The Nd_(14)Fe_(73)Co_6B_7 magnetic powder with high coercivity was effectively made of its ingot by hydrogenizing-disproportionating-dehydrogenizing, so called HDD process, under H_2 atmosphere. The high coercivity of the powder was found to be dependent on the decomposition of Nd_2Fe(Co)_4B phase during hydrogenation and consequent upon recrystallization during dehydrogenation. And the contrast of grain size in between original ingot powder and recrystallized one, from 10—50 down to 0.3--1μm, may be the principal cause for this improvement.

Key words: NdFeB powder HDD process recrystallization coercivity

Received: 18 August 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I8/91

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