A comparative study of the sintering behaviour of NdFeB and PrFeB for permanent magnet applications

Taylor, M.; Davies, B. E.; Harris, I.R.

doi:10.1016/s0304-8853(01)01237-9

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…This would result in a higher rate of densification during the rearrangement and solution-reprecipitation stages, with possible overlap, as observed previously for Pr-based compacts on sintering [25].…”

Section: Resultsmentioning

confidence: 54%

“…This may explain the appearance of isolated pockets of excessive grain growth in the Nd-Fe-B sintered magnets with oxygen contents ≥1700 ppm, and may suggest that the pronounced grain growth seen for the Nd-Fe-B sintered magnets is intrinsically associated with the oxygen content (or oxides present) at low oxygen contents, where compositional gradients may exist in the grain boundary regions, which are potential causes of exaggerated grain growth. In contrast, for the Pr-Fe-B sintered magnets, the exaggerated grain growth observed at low oxygen contents (∼1400-1950 ppm) may be an inherent consequence of the crossover in liquid phase sintering (LPS) mechanisms, as observed previously [25].…”

Section: Resultsmentioning

confidence: 72%

“…A comparative study of the sintering behaviour of Nd 16 Fe 76 B 8 and Pr 16 Fe 76 B 8 hydrided material has shown that Pr-based compacts exhibit faster densification in the lower temperature ranges [25]; attributed to the crossover of the rearrangement and solution-reprecipitation mechanisms. In contrast, in the case of Nd-based compacts, densification occurs as a well-defined two-stage process [25][26][27].…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, in the case of Nd-based compacts, densification occurs as a well-defined two-stage process [25][26][27]. The higher rate of densification in Pr-Fe-B was also attributed to the possible differences in the solubilities of Pr 2 Fe 14 B and Nd 2 Fe 14 B in the respective liquid phases [25].…”

Section: Resultsmentioning

confidence: 99%

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Influence of oxygen content on grain growth in Pr–Fe–B/Nd–Fe–B sintered magnets

Corfield

Harris

Williams

2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Influence of oxygen content on grain growth in Pr–Fe–B/Nd–Fe–B sintered magnets

Corfield

Harris

Williams

2008

Journal of Alloys and Compounds

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“…We believe that the precipitation is due to the presence of defects in the main phase particles. During "Solution Re-precipitation" stage in sintering process, 11 Ce escaped from the matrix magnetic grains and agglomerated at the defect area. Fig.…”

Section: B Morphologies and Distribution Of Matrix Grains In The Sinmentioning

confidence: 99%

Investigation of chemical composition and crystal structure in sintered Ce15Nd15FebalB1 magnet

et al. 2014

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The substitution of cerium, a more abundant rare-earth element, for sintered Nd-Fe-B magnets has drawn intense interest. In the present work, nominal composition of Ce15Nd15FebalB1 (wt. %), with cerium constitutes increased to 50% of the total rare-earth content, was used. And Ce-free Nd30FebalB1 (wt. %) was prepared by the same preparation process as comparison. The microstructure of the sintered magnets has been investigated by means of X-ray diffraction and transmission electron microscope. The results show that there are three kinds of RE-rich phases in the same magnet, i.e., fcc-(Ce,Nd)Ox (a=0.547nm), hcp-(Ce,Nd)2O3 (a=0.386nm, c=0.604nm) and bcc-(Ce,Nd)2O3 (a=1.113nm). Ors of (140)(Ce,Nd)2Fe14B// (1-21)bcc-(Ce,Nd)2O3(∼3°), [001](Ce,Nd)2Fe14B// [-214]bcc-(Ce,Nd)2O3; (01-1)(Ce,Nd)2Fe14B// (101)fcc- (Ce,Nd)Ox(∼2°), [101](Ce,Nd)2Fe14B// [12-1]fcc-(Ce,Nd)Ox were found through selected area electron diffraction (SAED) analysis. According to the analysis, it can be concluded that cerium has partly substituted for neodymium by occupying the corresponding atom sites in the Ce15Nd15FebalB1 magnet, without changing the crystal configuration.

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