对磁路设计人员来说 ,精确知道不同种类磁体在不同温度范围内的磁性能随温度的变化情况是非常有用的。本文对Alnico、Sm2 Co17、普通Nd Fe B、低温度系数Nd Fe B四种磁体的可逆磁通在室温～ 12 0℃温度区间内的变化情况及其不同温度区...对磁路设计人员来说 ,精确知道不同种类磁体在不同温度范围内的磁性能随温度的变化情况是非常有用的。本文对Alnico、Sm2 Co17、普通Nd Fe B、低温度系数Nd Fe B四种磁体的可逆磁通在室温～ 12 0℃温度区间内的变化情况及其不同温度区间的平均温度系数进行了详细测量。得到了一些对磁路设计人员较有用的结果。展开更多
Permanent magnets capable of reliably operating at high temperatures up to ~450?C are required in advanced power systems for future aircrafts, vehicles, and ships. Those operating temperatures are far beyond the capab...Permanent magnets capable of reliably operating at high temperatures up to ~450?C 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 Sm_2(Co, Fe, Cu, Zr)_(17)-type magnets capable of operating at high temperatures up to 550?C. 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 Sm_2(Co, Fe, Cu, Zr)_(17)-type magnets for operation at temperatures from 300?C to 550?C. 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.展开更多
文摘对磁路设计人员来说 ,精确知道不同种类磁体在不同温度范围内的磁性能随温度的变化情况是非常有用的。本文对Alnico、Sm2 Co17、普通Nd Fe B、低温度系数Nd Fe B四种磁体的可逆磁通在室温～ 12 0℃温度区间内的变化情况及其不同温度区间的平均温度系数进行了详细测量。得到了一些对磁路设计人员较有用的结果。
文摘Permanent magnets capable of reliably operating at high temperatures up to ~450?C 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 Sm_2(Co, Fe, Cu, Zr)_(17)-type magnets capable of operating at high temperatures up to 550?C. 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 Sm_2(Co, Fe, Cu, Zr)_(17)-type magnets for operation at temperatures from 300?C to 550?C. 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.
