Metal Injection Moulding of NdFeB Based on Recycled Powders
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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World PM2016 Congress & Exhibition. ed. / Frank Petzoldt. Hamburg, Germany: European Powder Metallurgy Association, 2016. p. 1-7.
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Metal Injection Moulding of NdFeB Based on Recycled Powders
AU - Imgrund, Philipp
AU - Weber, Oxana
AU - Schlauf, Thomas
AU - Pischang, Karsten
AU - Pickering, Lydia
AU - Walton, Allan
AU - Gonzalez-Gutierrez, Joamin
AU - Kukla, Christian
AU - Burkhardt, Carlo
PY - 2016/10/9
Y1 - 2016/10/9
N2 - Over the last ten years several groups have been carrying out research into metal injection moulding (MIM) of neodymium-iron-boron (NdFeB) powders to produce isotropic or anisotropic rare earth magnets with higher complexity than in the conventional press and sintering approaches. However, difficult processability due to the high affinity of the powder to oxygen and carbon pickup remains problematic in terms of obtaining sufficient remanence and coercivity. In this paper, a new approach to MIM of NdFeB magnets is presented. It is based on the use of powder obtained from recycling of used rare earth magnets by the hydrogen decrepitation (HD) process. Different types of binder systems have been used for producing mouldable MIM feedstock. Influence of debinding and sintering conditions on interstitial contents and magnetic properties of sintered MIM parts are presented and discussed. Magnets with a remanence of 570 mT, a coercivity of 970 kA/m and an energy product of 57 kJ/m³ could be produced without additional heat treatment.
AB - Over the last ten years several groups have been carrying out research into metal injection moulding (MIM) of neodymium-iron-boron (NdFeB) powders to produce isotropic or anisotropic rare earth magnets with higher complexity than in the conventional press and sintering approaches. However, difficult processability due to the high affinity of the powder to oxygen and carbon pickup remains problematic in terms of obtaining sufficient remanence and coercivity. In this paper, a new approach to MIM of NdFeB magnets is presented. It is based on the use of powder obtained from recycling of used rare earth magnets by the hydrogen decrepitation (HD) process. Different types of binder systems have been used for producing mouldable MIM feedstock. Influence of debinding and sintering conditions on interstitial contents and magnetic properties of sintered MIM parts are presented and discussed. Magnets with a remanence of 570 mT, a coercivity of 970 kA/m and an energy product of 57 kJ/m³ could be produced without additional heat treatment.
KW - metal injection molding
KW - magnets
KW - Rare earths recycling
KW - sintering
M3 - Conference contribution
SP - 1
EP - 7
BT - World PM2016 Congress & Exhibition
A2 - Petzoldt, Frank
PB - European Powder Metallurgy Association
CY - Hamburg, Germany
T2 - Powder Metallurgy World Congress and Exhibition
Y2 - 9 October 2016 through 13 October 2016
ER -
