高能球磨制备高矫顽力各向异性Sm2Fe17N3磁粉

doi:10.19976/j.cnki.43-1448/TF.2021063

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Abstract Sm₂Fe₁₇N₃ magnetic powders were prepared by high-energy ball milling. The effects of ball milling times on the magnetic properties and microstructure of Sm₂Fe₁₇N₃ magnetic powders were studied. The results show that the coercivity of Sm₂Fe₁₇N₃ powders increases first and then decreases with the milling time increases from 0 min to 60 min. When the milling time is 12 min, the grain size of Sm₂Fe₁₇N₃ phase decreases from 40.8 nm of the original powder to 31.8 nm. The powder has the highest coercivity of 875.6 kA/m, and the magnetic powder still maintains anisotropy. However, when the ball milling time is 30 mins, although the grain size is further reduced, the Sm₂Fe₁₇N₃ decomposes to form soft magnetic phases such as SmN and α-Fe, resulting in a decrease in the coercivity of the magnet. When the milling time is 60 min, the coercivity of magnetic powders decreases to 477.6 kA/m. This work provides an effective way for the preparation of high-quality Sm₂Fe₁₇N₃ powder precursors for the preparation of high-performance Sm₂Fe₁₇N₃ bonded magnets.

Key words： Sm₂Fe₁₇N₃ magnetic powders high-energy ball milling coercivity magnetic property anisotropy

Received: 26 June 2021 Published: 22 December 2021

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	LI Wei
	GUO Jiarui
	ZUO Siyuan
	WANG Yana
	HUANG Guangwei
	ZHENG Liyun

Cite this article:

LI Wei,GUO Jiarui,ZUO Siyuan, et al. Preparation of anisotropic Sm₂Fe₁₇N₃ magnetic powders with enhanced coercivity by high-energy ball milling[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(6): 554-559.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021063 OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I6/554

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