The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets

Manlong Xia; Asger Bech Abrahamsen; Christian Bahl; B. Veluri; A. I. Søegaard; P. Bøjsøe; S. Millot

doi:10.1016/j.jmmm.2016.09.014

The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets

Manlong Xia, Asger Bech Abrahamsen, Christian Bahl, B. Veluri, A. I. Søegaard, P. Bøjsøe, S. Millot

Department of Energy Conversion and Storage

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

The Pressless Process (PLP) was adopted to manufacture NdFeB sintered magnets, where the investigations on carbon and oxygen residues from heptane milling liquid media and graphite crucibles used for sintering were quantified to evaluate the influence on the magnetic characteristics. The carbon and oxygen content in the magnets produced from wet ball milling of strip cast flakes was found to be of the order 104 ppm and 4·104 ppm respectively, which resulted in soft magnetic behavior. However using jet milling the carbon and oxygen concentration were decreased by an order of magnitude resulting in coercivity of up to 829 kA/m. Thus the influence of the carbon from the graphite crucibles is small.

Original language	English
Journal	Journal of Magnetism and Magnetic Materials
Volume	422
Pages (from-to)	232-236
Number of pages	5
ISSN	0304-8853
DOIs	https://doi.org/10.1016/j.jmmm.2016.09.014
Publication status	Published - 2017

Keywords

Carbon
NdFeB
Oxygen
Sintering
α-Fe

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AIM2016 Fullpaper Manlong Xia postprintAccepted author manuscript, 832 KBLicence: CC BY-NC-ND

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title = "The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets",

abstract = "The Pressless Process (PLP) was adopted to manufacture NdFeB sintered magnets, where the investigations on carbon and oxygen residues from heptane milling liquid media and graphite crucibles used for sintering were quantified to evaluate the influence on the magnetic characteristics. The carbon and oxygen content in the magnets produced from wet ball milling of strip cast flakes was found to be of the order 104 ppm and 4·104 ppm respectively, which resulted in soft magnetic behavior. However using jet milling the carbon and oxygen concentration were decreased by an order of magnitude resulting in coercivity of up to 829 kA/m. Thus the influence of the carbon from the graphite crucibles is small.",

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T1 - The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets

AU - Xia, Manlong

AU - Abrahamsen, Asger Bech

AU - Bahl, Christian

AU - Veluri, B.

AU - Søegaard, A. I.

AU - Bøjsøe, P.

AU - Millot, S.

PY - 2017

Y1 - 2017

N2 - The Pressless Process (PLP) was adopted to manufacture NdFeB sintered magnets, where the investigations on carbon and oxygen residues from heptane milling liquid media and graphite crucibles used for sintering were quantified to evaluate the influence on the magnetic characteristics. The carbon and oxygen content in the magnets produced from wet ball milling of strip cast flakes was found to be of the order 104 ppm and 4·104 ppm respectively, which resulted in soft magnetic behavior. However using jet milling the carbon and oxygen concentration were decreased by an order of magnitude resulting in coercivity of up to 829 kA/m. Thus the influence of the carbon from the graphite crucibles is small.

AB - The Pressless Process (PLP) was adopted to manufacture NdFeB sintered magnets, where the investigations on carbon and oxygen residues from heptane milling liquid media and graphite crucibles used for sintering were quantified to evaluate the influence on the magnetic characteristics. The carbon and oxygen content in the magnets produced from wet ball milling of strip cast flakes was found to be of the order 104 ppm and 4·104 ppm respectively, which resulted in soft magnetic behavior. However using jet milling the carbon and oxygen concentration were decreased by an order of magnitude resulting in coercivity of up to 829 kA/m. Thus the influence of the carbon from the graphite crucibles is small.

KW - Carbon

KW - NdFeB

KW - Oxygen

KW - Sintering

KW - α-Fe

U2 - 10.1016/j.jmmm.2016.09.014

DO - 10.1016/j.jmmm.2016.09.014

M3 - Journal article

SN - 0304-8853

VL - 422

SP - 232

EP - 236

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets

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