Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering

E.G. Castle; Richard Sheridan; S Grasso; Allan Walton; MJ Reece

doi:10.1016/j.jmmm.2016.05.067

Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering

E.G. Castle, Richard Sheridan, S Grasso, Allan Walton, MJ Reece

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Abstract

A Spark Plasma Sintering (SPS) furnace was used to Flash-Sinter (FS) Nd-Fe-Dy-Co-B-Ga melt spun permanent magnetic material. During the 10 second “Flash” process (heating rate 2660 K min-1), sample sintering (to theoretical density) and deformation (54 % height reduction) occurred. This produced texturing and significant magnetic anisotropy, comparable to conventional die-upset magnets; yet with much greater coercivities (>1600 kA m-1) due to the nanoscale characteristics of the plate-like sintered grains. These preliminary results suggest that Flash-SPS could provide a new processing route for the mass production of highly anisotropic, nanocrystalline magnetic materials with high coercivity.

Original language	English
Pages (from-to)	279-283
Journal	Journal of Magnetism and Magnetic Materials
Volume	417
Early online date	25 May 2016
DOIs	https://doi.org/10.1016/j.jmmm.2016.05.067
Publication status	Published - 1 Nov 2016

Keywords

Magnetic anisotropy
High-speed deformation
Spark plasma sintering
Hard magnetic materials
Flash sintering

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title = "Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering",

abstract = "A Spark Plasma Sintering (SPS) furnace was used to Flash-Sinter (FS) Nd-Fe-Dy-Co-B-Ga melt spun permanent magnetic material. During the 10 second “Flash” process (heating rate 2660 K min-1), sample sintering (to theoretical density) and deformation (54 \% height reduction) occurred. This produced texturing and significant magnetic anisotropy, comparable to conventional die-upset magnets; yet with much greater coercivities (>1600 kA m-1) due to the nanoscale characteristics of the plate-like sintered grains. These preliminary results suggest that Flash-SPS could provide a new processing route for the mass production of highly anisotropic, nanocrystalline magnetic materials with high coercivity.",

keywords = "Magnetic anisotropy, High-speed deformation, Spark plasma sintering, Hard magnetic materials, Flash sintering",

author = "E.G. Castle and Richard Sheridan and S Grasso and Allan Walton and MJ Reece",

year = "2016",

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language = "English",

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journal = "Journal of Magnetism and Magnetic Materials",

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T1 - Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering

AU - Castle, E.G.

AU - Sheridan, Richard

AU - Grasso, S

AU - Walton, Allan

AU - Reece, MJ

PY - 2016/11/1

Y1 - 2016/11/1

N2 - A Spark Plasma Sintering (SPS) furnace was used to Flash-Sinter (FS) Nd-Fe-Dy-Co-B-Ga melt spun permanent magnetic material. During the 10 second “Flash” process (heating rate 2660 K min-1), sample sintering (to theoretical density) and deformation (54 % height reduction) occurred. This produced texturing and significant magnetic anisotropy, comparable to conventional die-upset magnets; yet with much greater coercivities (>1600 kA m-1) due to the nanoscale characteristics of the plate-like sintered grains. These preliminary results suggest that Flash-SPS could provide a new processing route for the mass production of highly anisotropic, nanocrystalline magnetic materials with high coercivity.

AB - A Spark Plasma Sintering (SPS) furnace was used to Flash-Sinter (FS) Nd-Fe-Dy-Co-B-Ga melt spun permanent magnetic material. During the 10 second “Flash” process (heating rate 2660 K min-1), sample sintering (to theoretical density) and deformation (54 % height reduction) occurred. This produced texturing and significant magnetic anisotropy, comparable to conventional die-upset magnets; yet with much greater coercivities (>1600 kA m-1) due to the nanoscale characteristics of the plate-like sintered grains. These preliminary results suggest that Flash-SPS could provide a new processing route for the mass production of highly anisotropic, nanocrystalline magnetic materials with high coercivity.

KW - Magnetic anisotropy

KW - High-speed deformation

KW - Spark plasma sintering

KW - Hard magnetic materials

KW - Flash sintering

U2 - 10.1016/j.jmmm.2016.05.067

DO - 10.1016/j.jmmm.2016.05.067

M3 - Article

SN - 0304-8853

VL - 417

SP - 279

EP - 283

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering

Abstract

Keywords

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