A new class of Sm-TM magnets for operating temperatures up to 550°C

Walmer, M.H.; Chen, Christina

doi:10.1109/20.908807

Cited by 90 publications

(30 citation statements)

References 13 publications

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“…As shown in Figure 4 (right), the Dy added Nd-Fe-B retains linear B curves at temperatures up to about 175 ° C. Most of commercially available hard ferrites do not have a linear B curve at room temperature; however, that does not prevent ferrite from being used for motor applications since ferrite has a unique positive temperature coeffi cient of coercivity, as shown in Figure 5 . [ 20 ] The i H c of the ferrite magnet increases from 3.2 kOe at 0 ° C to 5.9 kOe at shown in Figure 4 , Alnico has nonlinear demagnetization curves and it is not suitable for motor applications. Sm-Co type magnets have a very good, linear B curve at room temperature and retain the linear B curve in the temperature range of 300 ° C to 550 ° C, depending on the alloy composition.…”

Section: Hard Magnetic Materialsmentioning

confidence: 99%

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Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient

et al. 2010

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A new energy paradigm, consisting of greater reliance on renewable energy sources and increased concern for energy efficiency in the total energy lifecycle, has accelerated research into energy-related technologies. Due to their ubiquity, magnetic materials play an important role in improving the efficiency and performance of devices in electric power generation, conditioning, conversion, transportation, and other energy-use sectors of the economy. This review focuses on the state-of-the-art hard and soft magnets and magnetocaloric materials, with an emphasis on their optimization for energy applications. Specifically, the impact of hard magnets on electric motor and transportation technologies, of soft magnetic materials on electricity generation and conversion technologies, and of magnetocaloric materials for refrigeration technologies, are discussed. The synthesis, characterization, and property evaluation of the materials, with an emphasis on structure-property relationships, are discussed in the context of their respective markets, as well as their potential impact on energy efficiency. Finally, considering future bottlenecks in raw materials, options for the recycling of rare-earth intermetallics for hard magnets will be discussed.

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Section: Hard Magnetic Materialsmentioning

confidence: 99%

“…Figure 6 shows the demagnetization curves at 25 to 200 ° C in 25 ° C increments for an Nd-Dy-Fe-B magnet that can be used for hybrid vehicle motors. The fi gure also shows the load lines with [ 20 ] The ( BH ) max at 25 ° C is in the parenthesis. Reproduced with permission.…”

Section: Hard Magnetic Materialsmentioning

confidence: 99%

Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient

et al. 2010

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“…Sm-Co-type magnets have retained their dominance at elevated temperatures due to their high magnetocrystalline anisotropy and high Curie temperature [1]. Up till now, powder metallurgy is the most commonly used process to produce Sm 2 Co 17 -type permanent magnets because of its high technical maturity.…”

Section: Introductionmentioning

confidence: 99%

Sm12Co59Cu6Fe20Zr3 sintered magnets made from as-cast alloy and melt-spun ribbons

Sun

Zhang

Cui

et al. 2009

Journal of Alloys and Compounds

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“…The microstructure of Sm2Co17-type alloys has been characterised more fully elsewhere [6][7][8], but broadly consists of Sm2Co17 cells ∼100 nm in size surrounded by SmCo5 boundaries, both penetrated by Zr-rich lamellae with a thickness of several nm perpendicular to the c-axis. On a larger scale, this structure is divided into equiaxed grains approximately 40-50 m across and interspersed with 2-5 m particles of Sm oxide which form during alloy production.…”

Section: Methodsmentioning

confidence: 99%