J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (10): 1087-1096.DOI: 10.1016/j.jmst.2017.06.019
• Orginal Article • Previous Articles Next Articles
Jiang Qingzheng, Zhong Zhenchen*()
Received:
2017-01-08
Revised:
2017-02-24
Accepted:
2017-02-27
Online:
2017-10-25
Published:
2018-01-25
Contact:
Zhong Zhenchen
About author:
1 These two authors contributed equally to this paper.
Jiang Qingzheng, Zhong Zhenchen. Research and development of Ce-containing Nd2Fe14B-type alloys and permanent magnetic materials[J]. J. Mater. Sci. Technol., 2017, 33(10): 1087-1096.
Compound | Js (T) | Ha (kOe) | Tc (K) | a (?) | c (?) | References |
---|---|---|---|---|---|---|
Nd2Fe14B | 1.61 | 73 | 585 | 8.80 | 12.20 | [ |
Pr2Fe14B | 1.56 | 87 | 565 | 8.80 | 12.23 | [ |
Ce2Fe14B | 1.17 | 26 | 424 | 8.76 | 12.11 | [ |
Table 1 Saturation magnetizations Js, anisotropy fields Ha, Curie temperatures Tc and lattice constants of the RE2Fe14B compounds at room temperature.
Compound | Js (T) | Ha (kOe) | Tc (K) | a (?) | c (?) | References |
---|---|---|---|---|---|---|
Nd2Fe14B | 1.61 | 73 | 585 | 8.80 | 12.20 | [ |
Pr2Fe14B | 1.56 | 87 | 565 | 8.80 | 12.23 | [ |
Ce2Fe14B | 1.17 | 26 | 424 | 8.76 | 12.11 | [ |
Fig. 5. Transmission electron microscopy (TEM) micrographs of the (a) Ce-Fe-B, (b) Ce-Fe-B-Ga, (c) wheel side, (d) free side of (Nd0.75Ce0.25)2Fe14B melt-spun ribbons [54].
(Nd,Ce)-based alloys | Nd-based alloys | References | ||
---|---|---|---|---|
Composition 1 (wt%) | Hcj (kOe) | Composition 2 (wt%) | Hcj (kOe) | |
[(Nd4Pr)0.76Ce0.24]27Fe72B | 8.5 | (Nd4Pr)27Fe72B | 7.5 | [34] |
[Nd0.8Ce0.2]2Fe14B | 10 | Nd2Fe14B | 8.4 | [37] |
Table 2 Abnormal variation of coercivity in Ce substituted Nd-based alloys.
(Nd,Ce)-based alloys | Nd-based alloys | References | ||
---|---|---|---|---|
Composition 1 (wt%) | Hcj (kOe) | Composition 2 (wt%) | Hcj (kOe) | |
[(Nd4Pr)0.76Ce0.24]27Fe72B | 8.5 | (Nd4Pr)27Fe72B | 7.5 | [34] |
[Nd0.8Ce0.2]2Fe14B | 10 | Nd2Fe14B | 8.4 | [37] |
Phase | Type of reaction | Reaction formula | Temperature (°C) |
---|---|---|---|
Fe2B | Eutectic | L → γ-Fe + Fe2B | 1173 |
Fe | Eutectic | L → γ-Fe + Fe2B | 1173 |
Ce2Fe14B | Peritectic | L' + γ-Fe + Fe2B → Ce2Fe14B | 982 |
Ce2Fe17 | Peritectic | L” + γ-Fe → Ce2Fe17 | 970 |
CeFe2 | Peritectic | L”' + Ce2Fe17 → CeFe2 | 876 |
Table 3 Summary of reactions during cooling for Ce14.16Fe79.82B6.02 (at.%) strips [35].
Phase | Type of reaction | Reaction formula | Temperature (°C) |
---|---|---|---|
Fe2B | Eutectic | L → γ-Fe + Fe2B | 1173 |
Fe | Eutectic | L → γ-Fe + Fe2B | 1173 |
Ce2Fe14B | Peritectic | L' + γ-Fe + Fe2B → Ce2Fe14B | 982 |
Ce2Fe17 | Peritectic | L” + γ-Fe → Ce2Fe17 | 970 |
CeFe2 | Peritectic | L”' + Ce2Fe17 → CeFe2 | 876 |
Fig. 6. (a) Cross-sectional BSE image of Nd15Ce15Fe69B1 (wt%) strip-casting flakes; (b) BSE images of Ce30.5Fe68.5B1 (wt%) strip-casting flakes; (c) Ce25.5Ho5Fe68.5B1 (wt%) strip-casting flakes; (d) Ce22Ho5Nd4Fe67.1Mn0.96B0.94 (wt%) strip-casting flakes [60,64].
Fig. 7. Demagnetization curves of the (a) (Nd1-xCex)30Fe69B1 (wt%) sintered magnets for x = 0, 0.3,0.5; (b) [(Pr,Nd)1-xCex]27.5Dy3Al0.1Cu0.1Fe68.3B1 (wt%) sintered magnets [8,68].
Fig. 8. BSE images of sintered [(Pr,Nd)1-xCex]27.5Dy3Al0.1Cu0.1Fe68.3B1 (wt%) magnets: (a) x = 0; (b) x = 0.08; (c) x = 0.16; (d) x = 0.24; (e) x = 0.32; and (f) x = 0.56 [67].
Fig. 10. BSE-SEM micrographs (bright and grey contrasts refer to RE-rich and matrix phases, respectively) and corresponding elemental mappings of Nd, Ce and La for multiple main phases magnet [79].
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