Thermal Aging of NdFeB Compression Molded Magnets

Daniel Rodrigues; Gilberto Vicente Concílio; Jose Adilson de Castro; Marcos Flavio de Campos

doi:10.4028/www.scientific.net/MSF.899.572

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HomeMaterials Science ForumMaterials Science Forum Vol. 899Thermal Aging of NdFeB Compression Molded Magnets

Thermal Aging of NdFeB Compression Molded Magnets

Abstract:

Compression moulded rare earth magnets are used in many applications, and one of them is in electrical motors, which can operate at temperatures as high as 150 °C. In high temperatures, oxidation and phase transformations may affect magnetic properties. Another issue to be considered is polymer degradation. In this paper cylindrical samples of a commercial ready-to-press raw material (MQPB+, Molycorp-Magnequench) were pressed to densities close to 5.50 g/cm³. These samples were cured (low temperature heat treatment) and thermal aged at 200 °C for 72 hours, under dynamic air. Physical characteristics (weight, dimensions and densities) and magnetic properties were measured at room temperature in a TCH2020 hysteresigraph (Globalmag). Degradation of magnetic properties was observed, and oxidation seems to be the main reason.

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Periodical:

Materials Science Forum (Volume 899)

Pages:

572-575

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.899.572

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Online since:

July 2017

Authors:

Daniel Rodrigues, Gilberto Vicente Concílio, Jose Adilson de Castro, Marcos Flavio de Campos

Keywords:

Bonded Magnets, Magnets, NdFeB, Rare Earth

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References

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