Mechanical properties of Nylon bonded Nd-Fe-B permanent magnets

Monika G. Garrell; Albert J. Shih; Bao Min Ma; Edgar Lara-Curzio; Ronald O. Scattergood

doi:10.1016/S0304-8853(02)00983-6

Mechanical properties of Nylon bonded Nd-Fe-B permanent magnets

Monika G. Garrell, Albert J. Shih, Bao Min Ma, Edgar Lara-Curzio, Ronald O. Scattergood

Research output: Contribution to journal › Article › peer-review

71 Scopus citations

Abstract

Tensile and flexural strengths as well as Young's modulus of Polyamide-11 (Nylon-11) based injection molded Nd-Fe-B magnets have been determined from -40°C to 100°C. Two types of Nd-Fe-B powders were included in this study. One is the conventional melt spun powder of irregular shape, the other is the atomized powder of spherical morphology. It was found that the tensile strength varies significantly with both test temperature and morphology of Nd-Fe-B powder. For a fixed volume fraction of magnet powder, the tensile strength decreases with increasing temperature. For bonded magnets made of melt spun powder, the tensile strength increases with increasing volume fraction of magnet powder. Specimens made of spherical atomized powders exhibit much lower tensile strength and better flexibility when compared to those made of melt spun powder. Scanning electron microscopy (SEM) analysis indicated that the debonding at the Nd-Fe-B powder and Nylon interface is the main cause of failure at 23°C and 100°C. At -40°C, a different failure mechanism with the fracture of Nd-Fe-B particle was observed on magnets prepared from melt spun powders. For the specimen containing 59.7vol% of melt spun powder, a bending strength of 41MPa and dynamic Young's modulus of 12.7GPa were obtained.

Original language	English
Pages (from-to)	32-43
Number of pages	12
Journal	Journal of Magnetism and Magnetic Materials
Volume	257
Issue number	1
DOIs	https://doi.org/10.1016/S0304-8853(02)00983-6
State	Published - Feb 2003

Funding

Portion of this research was sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC for the US Department of Energy under contract number DE-AC05-00OR22725 and by National Science Foundation Grant #9983582 (Dr. K.P. Rajurkar, Program Director). The authors also gratefully acknowledge the help of Chris Stevens, Ken Liu, and Dorothy Coffey at the High Temperature Materials Laboratory of Oak Ridge National Laboratory.

Keywords

Atomized NdFeB
Bonded magnets
Mechanical properties
Melt spun NdFeB

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10.1016/S0304-8853(02)00983-6

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title = "Mechanical properties of Nylon bonded Nd-Fe-B permanent magnets",

abstract = "Tensile and flexural strengths as well as Young's modulus of Polyamide-11 (Nylon-11) based injection molded Nd-Fe-B magnets have been determined from -40°C to 100°C. Two types of Nd-Fe-B powders were included in this study. One is the conventional melt spun powder of irregular shape, the other is the atomized powder of spherical morphology. It was found that the tensile strength varies significantly with both test temperature and morphology of Nd-Fe-B powder. For a fixed volume fraction of magnet powder, the tensile strength decreases with increasing temperature. For bonded magnets made of melt spun powder, the tensile strength increases with increasing volume fraction of magnet powder. Specimens made of spherical atomized powders exhibit much lower tensile strength and better flexibility when compared to those made of melt spun powder. Scanning electron microscopy (SEM) analysis indicated that the debonding at the Nd-Fe-B powder and Nylon interface is the main cause of failure at 23°C and 100°C. At -40°C, a different failure mechanism with the fracture of Nd-Fe-B particle was observed on magnets prepared from melt spun powders. For the specimen containing 59.7vol\% of melt spun powder, a bending strength of 41MPa and dynamic Young's modulus of 12.7GPa were obtained.",

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AU - Garrell, Monika G.

AU - Shih, Albert J.

AU - Ma, Bao Min

AU - Lara-Curzio, Edgar

AU - Scattergood, Ronald O.

PY - 2003/2

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N2 - Tensile and flexural strengths as well as Young's modulus of Polyamide-11 (Nylon-11) based injection molded Nd-Fe-B magnets have been determined from -40°C to 100°C. Two types of Nd-Fe-B powders were included in this study. One is the conventional melt spun powder of irregular shape, the other is the atomized powder of spherical morphology. It was found that the tensile strength varies significantly with both test temperature and morphology of Nd-Fe-B powder. For a fixed volume fraction of magnet powder, the tensile strength decreases with increasing temperature. For bonded magnets made of melt spun powder, the tensile strength increases with increasing volume fraction of magnet powder. Specimens made of spherical atomized powders exhibit much lower tensile strength and better flexibility when compared to those made of melt spun powder. Scanning electron microscopy (SEM) analysis indicated that the debonding at the Nd-Fe-B powder and Nylon interface is the main cause of failure at 23°C and 100°C. At -40°C, a different failure mechanism with the fracture of Nd-Fe-B particle was observed on magnets prepared from melt spun powders. For the specimen containing 59.7vol% of melt spun powder, a bending strength of 41MPa and dynamic Young's modulus of 12.7GPa were obtained.

AB - Tensile and flexural strengths as well as Young's modulus of Polyamide-11 (Nylon-11) based injection molded Nd-Fe-B magnets have been determined from -40°C to 100°C. Two types of Nd-Fe-B powders were included in this study. One is the conventional melt spun powder of irregular shape, the other is the atomized powder of spherical morphology. It was found that the tensile strength varies significantly with both test temperature and morphology of Nd-Fe-B powder. For a fixed volume fraction of magnet powder, the tensile strength decreases with increasing temperature. For bonded magnets made of melt spun powder, the tensile strength increases with increasing volume fraction of magnet powder. Specimens made of spherical atomized powders exhibit much lower tensile strength and better flexibility when compared to those made of melt spun powder. Scanning electron microscopy (SEM) analysis indicated that the debonding at the Nd-Fe-B powder and Nylon interface is the main cause of failure at 23°C and 100°C. At -40°C, a different failure mechanism with the fracture of Nd-Fe-B particle was observed on magnets prepared from melt spun powders. For the specimen containing 59.7vol% of melt spun powder, a bending strength of 41MPa and dynamic Young's modulus of 12.7GPa were obtained.

KW - Atomized NdFeB

KW - Bonded magnets

KW - Mechanical properties

KW - Melt spun NdFeB

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JO - Journal of Magnetism and Magnetic Materials

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ER -

Mechanical properties of Nylon bonded Nd-Fe-B permanent magnets

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