Structure and Magnetic Properties of Nd–Fe–B Magnets Prepared from DyH2-Containing Powder Mixtures

被引：11

作者：

Burkhanov G.S. ^{[1
]}

Kolchugina N.B. ^{[1
]}

Lukin A.A. ^{[2
]}

Koshkidko Y.S. ^{[3
]}

Cwik J. ^{[3
]}

Skotnicova K. ^{[4
]}

Sitnov V.V. ^{[2
]}

机构：

[1] Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow

[2] JSC Spetsmagnit, Moscow

[3] International Laboratory of High Magnetic Fields and Low Temperatures, Polish Academy of Sciences, Wroclaw

[4] Vysoka Skola Banska—TUO, Ostrava-Poruba

来源：

Inorganic Materials: Applied Research | 2018年 / 9卷 / 03期

关键词：

coercive force; dysprosium hydride; grain-boundary diffusion; low-temperature treatment; Nd–Fe–B permanent magnets; strip-casting;

D O I：

10.1134/S2075113318030115

中图分类号：

学科分类号：

摘要：

Sintered Nd–Pr–Dy–Fe–B permanent magnets were prepared by a powder blending technique using mixtures consisting of strip-casting alloy (wt %) 24.0 Nd, 6.5 Pr, 0.5 Dy, 1.0 B, 0.2 Al, 65.8 Fe and 2 wt % DyH2 dysprosium hydride. After optimum heat treatment of magnets at 500°C for 1 h, the following hysteretic characteristics were reached: remanence Br = 1.29 T; coercive force jHc = 1309 kA/m; critical field Hk = 1220 kA/m; and the maximum energy product (BH)max = 322 kJ/m3. The characteristic peculiarity of the magnets prepared from hydride-containing power mixtures is the stability of hysteretic properties in the course of subsequent stepped annealings or progressive heatings at temperatures of 250–500°C for, in total, more than 20 h. Conditions of low-temperature annealings resulting in the degradation and subsequent restoration of hysteretic properties of magnets are determined. The evolution of the microstructure and phase composition of magnets in the course of heat treatments was studied by X-ray diffraction analysis and scanning electron microscopy, and the correlation between the structural changes and hysteretic properties of magnets is discussed. © 2018, Pleiades Publishing, Ltd.

引用

页码：509 / 516

页数：7

共 27 条

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