Recent Developments in High-Temperature Permanent Magnet Materials

Liu, Sam Shiqiang

doi:10.1007/1-4020-7984-2_32

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…Subsequently, such a composition has a higher volume fraction of the Sm(Co,Cu) 5 phase. The ( BH ) max of these magnets is approximately 20 MGOe [ 24 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 6 shows the dependencies of the temperature coefficient of coercivity β on the Sm content of the Sm(Co 0.753 Fe 0.14 Cu 0.08 Zr 0.027 ) z and Sm(Co 0.795 Fe 0.09 Cu 0.09 Zr 0.025 ) z magnets, which were calculated from the data [ 44 ] and [ 24 ] for two composition ranges with different Fe content. It can be seen that with the Fe content x = 0.09, the dependence is linear (the lines are an approximation using linear dependence), and the temperature dependencies of coercivity are abnormal [ 24 ]. With increasing Fe content x = 0.14, the slope of the β( z ) dependence changes at z = 7.4.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, on the basis of detailed X-ray diffraction, electron microscopy, and magnetic hysteresis studies, it has been established that the absolute value of the negative temperature coefficient of the coercivity β decreases and then becomes positive with an increase in the volume fraction of the Sm(Co,Cu) 5 (1:5) phase and Cu content in the cellular structure [ 24 ]. It was shown that the contents of Sm, Cu, and Fe significantly affect the coercivity at high temperatures [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Hard Magnetic Properties and the Features of Nanostructure of High-Temperature Sm-Co-Fe-Cu-Zr Magnet with Abnormal Temperature Dependence of Coercivity

et al. 2023

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This paper presents methods and approaches that can be used for production of Sm-Co-Fe-Cu-Zr permanent magnets with working temperatures of up to 550 °C. It is shown that the content of Sm, Cu, and Fe significantly affects the coercivity (Hc) value at high operating temperatures. A decrease in the content of Fe, which replaces Co, and an increase in the content of Sm in Sm-Co-Fe-Cu-Zr alloys lead to a decrease in Hc value at room temperature, but significantly increase Hc at temperatures of about 500 °C. Increasing the Cu concentration enhances the Hc values at all operating temperatures. From analysis of the dependence of temperature coefficients of the coercivity on the concentrations of various constituent elements in this alloy, the optimum chemical composition that qualifies for high-temperature permanent magnet (HTPM) application were determined. 3D atom probe tomography analysis shows that the nanostructure of the HTPM is characterized by the formation of Sm2(Co,Fe)17 (2:17) cells relatively smaller in size along with the slightly thickened Sm(Co,Cu)5 (1:5) boundary phase compared to those of the high-energy permanent magnet compositions. An inhomogeneous distribution of Cu was also noticed in the 1:5 phase. At the boundary between 1:5 and 2:17 phases, an interface with lowered anisotropy constants has developed, which could be the reason for the observed high coercivity values.

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“…Subsequently, such a composition has a higher volume fraction of the Sm(Co,Cu) 5 phase. The ( BH ) max of these magnets is approximately 20 MGOe [ 24 , 36 ].…”

Section: Resultsmentioning

confidence: 99%