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

Richard Sheridan; Andrew Williams; Ivor Harris; Allan Walton

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

Richard Sheridan, Andrew Williams, Ivor Harris, Allan Walton

Metallurgy and Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 and manufacturing scrap material. It has been shown that increasing the processing temperature increased the equilibrium pressure for disproportionation and overall reaction time. The magnetic properties were affected significantly by the change in processing temperature with a peak in properties observed at 880⁰C 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 has shown that simultaneous processing of sintered magnets with varying compositions could be achieved by increasing the hydrogen pressure.

Original language	English
Title of host publication	Proceedings of the 22nd International Workshop on Rare Earth Permanent Magnets and their Applications
Place of Publication	Nagasaki, Japan
Pages	394-397
Number of pages	4
Publication status	Published - Sept 2012

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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 and manufacturing scrap material. It has been shown that increasing the processing temperature increased the equilibrium pressure for disproportionation and overall reaction time. The magnetic properties were affected significantly by the change in processing temperature with a peak in properties observed at 880⁰C 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 has shown that simultaneous processing of sintered magnets with varying compositions could be achieved by increasing the hydrogen pressure.",

author = "Richard Sheridan and Andrew Williams and Ivor Harris and Allan Walton",

year = "2012",

month = sep,

language = "English",

pages = "394--397",

booktitle = "Proceedings of the 22nd International Workshop on Rare Earth Permanent Magnets and their Applications",

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Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets. / Sheridan, Richard; Williams, Andrew; Harris, Ivor et al.
Proceedings of the 22nd International Workshop on Rare Earth Permanent Magnets and their Applications. Nagasaki, Japan, 2012. p. 394-397 P3-012.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

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

AU - Sheridan, Richard

AU - Williams, Andrew

AU - Harris, Ivor

AU - Walton, Allan

PY - 2012/9

Y1 - 2012/9

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 and manufacturing scrap material. It has been shown that increasing the processing temperature increased the equilibrium pressure for disproportionation and overall reaction time. The magnetic properties were affected significantly by the change in processing temperature with a peak in properties observed at 880⁰C 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 has shown that simultaneous processing of sintered magnets with varying compositions could be achieved by increasing the hydrogen pressure.

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 and manufacturing scrap material. It has been shown that increasing the processing temperature increased the equilibrium pressure for disproportionation and overall reaction time. The magnetic properties were affected significantly by the change in processing temperature with a peak in properties observed at 880⁰C 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 has shown that simultaneous processing of sintered magnets with varying compositions could be achieved by increasing the hydrogen pressure.

M3 - Conference contribution

SP - 394

EP - 397

BT - Proceedings of the 22nd International Workshop on Rare Earth Permanent Magnets and their Applications

CY - Nagasaki, Japan

ER -

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

Abstract

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