Sm–Co high-temperature permanent magnet materials

doi:10.1088/1674-1056/28/1/017501

摘要/Abstract

摘要： Permanent magnets capable of reliably operating at high temperatures up to ~450℃ are required in advanced power systems for future aircrafts, vehicles, and ships. Those operating temperatures are far beyond the capability of Nd– Fe–B magnets. Possessing high Curie temperature, Sm–Co based magnets are still very important because of their hightemperature capability, excellent thermal stability, and better corrosion resistance. The extensive research performed around the year 2000 resulted in a new class of Sm₂(Co, Fe, Cu, Zr)₁₇-type magnets capable of operating at high temperatures up to 550℃. This paper gives a systematic review of the development of Sm–Co permanent magnets, from the crystal structures and phase diagrams to the intrinsic magnetic properties. An emphasis is placed on Sm₂(Co, Fe, Cu, Zr)₁₇-type magnets for operation at temperatures from 300℃ to 550℃. The thermal stability issues, including instantaneous temperature coefficients of magnetic properties, are discussed in detail. The significance of nanograin structure, nanocrystalline, and nanocomposite Sm–Co magnet materials, and prospects of future rare-earth permanent magnets are also given.

关键词: Sm-Co, Sm₂(Co,Fe,Cu,Zr)₁₇, high-temperature magnets, nanocomposite

Abstract: Permanent magnets capable of reliably operating at high temperatures up to ~450℃ are required in advanced power systems for future aircrafts, vehicles, and ships. Those operating temperatures are far beyond the capability of Nd– Fe–B magnets. Possessing high Curie temperature, Sm–Co based magnets are still very important because of their hightemperature capability, excellent thermal stability, and better corrosion resistance. The extensive research performed around the year 2000 resulted in a new class of Sm₂(Co, Fe, Cu, Zr)₁₇-type magnets capable of operating at high temperatures up to 550℃. This paper gives a systematic review of the development of Sm–Co permanent magnets, from the crystal structures and phase diagrams to the intrinsic magnetic properties. An emphasis is placed on Sm₂(Co, Fe, Cu, Zr)₁₇-type magnets for operation at temperatures from 300℃ to 550℃. The thermal stability issues, including instantaneous temperature coefficients of magnetic properties, are discussed in detail. The significance of nanograin structure, nanocrystalline, and nanocomposite Sm–Co magnet materials, and prospects of future rare-earth permanent magnets are also given.

Key words: Sm-Co, Sm₂(Co,Fe,Cu,Zr)₁₇, high-temperature magnets, nanocomposite

中图分类号: (Permanent magnets)

75.50.Ww

75.50.-y (Studies of specific magnetic materials)

刘世强. Sm–Co high-temperature permanent magnet materials[J]. 中国物理B, 2019, 28(1): 17501-017501.

Shiqiang Liu(刘世强). Sm–Co high-temperature permanent magnet materials[J]. Chin. Phys. B, 2019, 28(1): 17501-017501.

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