Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets

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Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets. / Sheridan, Richard; Williams, A.J; Harris, Ivor; Walton, A.

In: Journal of Magnetism and Magnetic Materials, Vol. 350, 01.01.2014, p. 114-118.

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@article{bbed669d44474e5aa03fefbdf2aa6857,
title = "Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets",
abstract = "The hydrogenation disproportionation desorption recombination (HDDR) process has been investigated as a possible means of producing bonded magnets from used NdFeB-type sintered magnets with compositions, Nd13.4Dy0.8Al0.7Nb0.3Fe78.5B6.3 and Nd12.5Dy1.8Al0.9Nb0.6Co5.0Fe72.8B6.4 (atomic%). It has been shown that by increasing the processing temperature, an increase in the equilibrium pressure for disproportionation and in the overall reaction time was observed. The magnetic properties of the lower Dy content magnet were affected significantly by the change in processing temperature with a peak in properties observed at 880 °C producing magnetic powder with a remanence of 1.08 (±0.02) T, a coercivity of 840 (±17) kA m−1, and a maximum energy product of 175 (±2.5) kJ m−3. Further work on magnets with a significantly higher Dy content has shown that simultaneous processing of sintered magnets with varying compositions can be achieved by increasing the hydrogen pressure, however a range of magnetic properties are produced depending on the initial compositions of the samples in the input feed.",
author = "Richard Sheridan and A.J Williams and Ivor Harris and A. Walton",
year = "2014",
month = jan,
day = "1",
doi = "10.1016/j.jmmm.2013.09.042",
language = "English",
volume = "350",
pages = "114--118",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets

AU - Sheridan, Richard

AU - Williams, A.J

AU - Harris, Ivor

AU - Walton, A.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The hydrogenation disproportionation desorption recombination (HDDR) process has been investigated as a possible means of producing bonded magnets from used NdFeB-type sintered magnets with compositions, Nd13.4Dy0.8Al0.7Nb0.3Fe78.5B6.3 and Nd12.5Dy1.8Al0.9Nb0.6Co5.0Fe72.8B6.4 (atomic%). It has been shown that by increasing the processing temperature, an increase in the equilibrium pressure for disproportionation and in the overall reaction time was observed. The magnetic properties of the lower Dy content magnet were affected significantly by the change in processing temperature with a peak in properties observed at 880 °C producing magnetic powder with a remanence of 1.08 (±0.02) T, a coercivity of 840 (±17) kA m−1, and a maximum energy product of 175 (±2.5) kJ m−3. Further work on magnets with a significantly higher Dy content has shown that simultaneous processing of sintered magnets with varying compositions can be achieved by increasing the hydrogen pressure, however a range of magnetic properties are produced depending on the initial compositions of the samples in the input feed.

AB - The hydrogenation disproportionation desorption recombination (HDDR) process has been investigated as a possible means of producing bonded magnets from used NdFeB-type sintered magnets with compositions, Nd13.4Dy0.8Al0.7Nb0.3Fe78.5B6.3 and Nd12.5Dy1.8Al0.9Nb0.6Co5.0Fe72.8B6.4 (atomic%). It has been shown that by increasing the processing temperature, an increase in the equilibrium pressure for disproportionation and in the overall reaction time was observed. The magnetic properties of the lower Dy content magnet were affected significantly by the change in processing temperature with a peak in properties observed at 880 °C producing magnetic powder with a remanence of 1.08 (±0.02) T, a coercivity of 840 (±17) kA m−1, and a maximum energy product of 175 (±2.5) kJ m−3. Further work on magnets with a significantly higher Dy content has shown that simultaneous processing of sintered magnets with varying compositions can be achieved by increasing the hydrogen pressure, however a range of magnetic properties are produced depending on the initial compositions of the samples in the input feed.

U2 - 10.1016/j.jmmm.2013.09.042

DO - 10.1016/j.jmmm.2013.09.042

M3 - Article

VL - 350

SP - 114

EP - 118

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

ER -