Mechanical properties of polyphenylene-sulfide (PPS) bonded Nd-Fe-B permanent magnets

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

doi:10.1016/S0921-5093(03)00400-3

Mechanical properties of polyphenylene-sulfide (PPS) bonded Nd-Fe-B permanent magnets

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

Energy Science and Technology Directorat

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

55 Scopus citations

Abstract

Mechanical properties, namely tensile and flexural strengths and elastic modulus, of polyphenylene-sulfide (PPS) bonded Nd-Fe-B magnets have been studied from -40 to 180°C. The ultimate tensile strength ( S_ut) of PPS bonded magnets decreases with increasing temperature. The tensile strength of PPS bonded Nd-Fe-B magnets was reduced significantly above 100°C. At 180°C, the PPS bonded magnets still exhibit a S_ut of 16-18 MPa. For bonded magnets with about 60% volume fraction of Nd-Fe-B powder, the PPS bonded magnet shows about twice the tensile strength and half the ultimate strain compared to that of Nylon bonded magnet. At room temperature, the flexural strength is, in general, comparable to the tensile strength. Dynamic elastic modulus measured using the impact resonance method was in good agreement with the elastic modulus obtained from tensile tests. Scanning Electron Microscopy analyses of the fractured surfaces revealed two distinct failure mechanisms. Debonding along the Nd-Fe-B particle and PPS interface is the main cause for failures at 100 and 180°C. The fracture of Nd-Fe-B particle was observed on the fracture surface of specimens tested at -40 and 23°C.

Original language	English
Pages (from-to)	375-383
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	359
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(03)00400-3
State	Published - Oct 25 2003

Funding

Portion of this research was sponsored by the National Science Foundation Grant #9983582 (Dr K.P. Rajurkar, Program Director) and 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 U.S. Department of Energy under contract number DE-AC05-00OR22725.

Funders	Funder number
Office of Transportation Technologies
National Science Foundation	9983582
U.S. Department of Energy	DE-AC05-00OR22725
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
UT-Battelle

Keywords

Elastic modulus
Flexural strength
Polyphenylene-sulfide bonded magnets
Tensile strength

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10.1016/S0921-5093(03)00400-3

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title = "Mechanical properties of polyphenylene-sulfide (PPS) bonded Nd-Fe-B permanent magnets",

abstract = "Mechanical properties, namely tensile and flexural strengths and elastic modulus, of polyphenylene-sulfide (PPS) bonded Nd-Fe-B magnets have been studied from -40 to 180°C. The ultimate tensile strength ( Sut) of PPS bonded magnets decreases with increasing temperature. The tensile strength of PPS bonded Nd-Fe-B magnets was reduced significantly above 100°C. At 180°C, the PPS bonded magnets still exhibit a Sut of 16-18 MPa. For bonded magnets with about 60% volume fraction of Nd-Fe-B powder, the PPS bonded magnet shows about twice the tensile strength and half the ultimate strain compared to that of Nylon bonded magnet. At room temperature, the flexural strength is, in general, comparable to the tensile strength. Dynamic elastic modulus measured using the impact resonance method was in good agreement with the elastic modulus obtained from tensile tests. Scanning Electron Microscopy analyses of the fractured surfaces revealed two distinct failure mechanisms. Debonding along the Nd-Fe-B particle and PPS interface is the main cause for failures at 100 and 180°C. The fracture of Nd-Fe-B particle was observed on the fracture surface of specimens tested at -40 and 23°C.",

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AU - Garrell, Monika G.

AU - Ma, Bao Min

AU - Shih, Albert J.

AU - Lara-Curzio, Edgar

AU - Scattergood, Ronald O.

PY - 2003/10/25

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N2 - Mechanical properties, namely tensile and flexural strengths and elastic modulus, of polyphenylene-sulfide (PPS) bonded Nd-Fe-B magnets have been studied from -40 to 180°C. The ultimate tensile strength ( Sut) of PPS bonded magnets decreases with increasing temperature. The tensile strength of PPS bonded Nd-Fe-B magnets was reduced significantly above 100°C. At 180°C, the PPS bonded magnets still exhibit a Sut of 16-18 MPa. For bonded magnets with about 60% volume fraction of Nd-Fe-B powder, the PPS bonded magnet shows about twice the tensile strength and half the ultimate strain compared to that of Nylon bonded magnet. At room temperature, the flexural strength is, in general, comparable to the tensile strength. Dynamic elastic modulus measured using the impact resonance method was in good agreement with the elastic modulus obtained from tensile tests. Scanning Electron Microscopy analyses of the fractured surfaces revealed two distinct failure mechanisms. Debonding along the Nd-Fe-B particle and PPS interface is the main cause for failures at 100 and 180°C. The fracture of Nd-Fe-B particle was observed on the fracture surface of specimens tested at -40 and 23°C.

AB - Mechanical properties, namely tensile and flexural strengths and elastic modulus, of polyphenylene-sulfide (PPS) bonded Nd-Fe-B magnets have been studied from -40 to 180°C. The ultimate tensile strength ( Sut) of PPS bonded magnets decreases with increasing temperature. The tensile strength of PPS bonded Nd-Fe-B magnets was reduced significantly above 100°C. At 180°C, the PPS bonded magnets still exhibit a Sut of 16-18 MPa. For bonded magnets with about 60% volume fraction of Nd-Fe-B powder, the PPS bonded magnet shows about twice the tensile strength and half the ultimate strain compared to that of Nylon bonded magnet. At room temperature, the flexural strength is, in general, comparable to the tensile strength. Dynamic elastic modulus measured using the impact resonance method was in good agreement with the elastic modulus obtained from tensile tests. Scanning Electron Microscopy analyses of the fractured surfaces revealed two distinct failure mechanisms. Debonding along the Nd-Fe-B particle and PPS interface is the main cause for failures at 100 and 180°C. The fracture of Nd-Fe-B particle was observed on the fracture surface of specimens tested at -40 and 23°C.

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Mechanical properties of polyphenylene-sulfide (PPS) bonded Nd-Fe-B permanent magnets

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