Microstructural improvement of NdFeB magnetic powders by the Zn vapor sorption treatment

L. Y. Zhu; T. Hirae; M. Itakura; N. Kuwano; K. Machida

doi:10.2320/matertrans.43.2673

Microstructural improvement of NdFeB magnetic powders by the Zn vapor sorption treatment

L. Y. Zhu, T. Hirae, M. Itakura, N. Kuwano, K. Machida

Materials Physics and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The microstructural modification for NdFeB magnetic powders (MQP-B) after Zn vapor sorption has been investigated by transmission electron microscopy (TEM). It is found that a coating layer about 100 mn thick was formed on the surface of powder. Selected area electron diffraction (SAED) pattern and high resolution transmission electron microscopy (HRTEM) analyses show that the coating layer consists of condensed nano-scale crystallites of Fe₁₁Zn₄₀, NdZn₅ and Zn. After the temperature for Zn vapor sorption is raised to 648 K, a thin layer has been formed on boundaries of Nd₂Fe₁₄B grains locally in the rim region of the powders. The morphology of the grain-boundary thin-layers is very similar to that in HDDR-NdFeB magnet powder after Zn vapor sorption treatment. Since the latter has a good thermal stability of magnetic property, the Zn vapor sorption treatment is expected to improve also the thermal stability of MQP-B magnet.

Original language	English
Pages (from-to)	2673-2677
Number of pages	5
Journal	Materials Transactions
Volume	43
Issue number	11
DOIs	https://doi.org/10.2320/matertrans.43.2673
Publication status	Published - Nov 2002

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Microstructural improvement of NdFeB magnetic powders by the Zn vapor sorption treatment",

abstract = "The microstructural modification for NdFeB magnetic powders (MQP-B) after Zn vapor sorption has been investigated by transmission electron microscopy (TEM). It is found that a coating layer about 100 mn thick was formed on the surface of powder. Selected area electron diffraction (SAED) pattern and high resolution transmission electron microscopy (HRTEM) analyses show that the coating layer consists of condensed nano-scale crystallites of Fe11Zn40, NdZn5 and Zn. After the temperature for Zn vapor sorption is raised to 648 K, a thin layer has been formed on boundaries of Nd2Fe14B grains locally in the rim region of the powders. The morphology of the grain-boundary thin-layers is very similar to that in HDDR-NdFeB magnet powder after Zn vapor sorption treatment. Since the latter has a good thermal stability of magnetic property, the Zn vapor sorption treatment is expected to improve also the thermal stability of MQP-B magnet.",

author = "Zhu, {L. Y.} and T. Hirae and M. Itakura and N. Kuwano and K. Machida",

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T1 - Microstructural improvement of NdFeB magnetic powders by the Zn vapor sorption treatment

AU - Zhu, L. Y.

AU - Hirae, T.

AU - Itakura, M.

AU - Kuwano, N.

AU - Machida, K.

PY - 2002/11

Y1 - 2002/11

N2 - The microstructural modification for NdFeB magnetic powders (MQP-B) after Zn vapor sorption has been investigated by transmission electron microscopy (TEM). It is found that a coating layer about 100 mn thick was formed on the surface of powder. Selected area electron diffraction (SAED) pattern and high resolution transmission electron microscopy (HRTEM) analyses show that the coating layer consists of condensed nano-scale crystallites of Fe11Zn40, NdZn5 and Zn. After the temperature for Zn vapor sorption is raised to 648 K, a thin layer has been formed on boundaries of Nd2Fe14B grains locally in the rim region of the powders. The morphology of the grain-boundary thin-layers is very similar to that in HDDR-NdFeB magnet powder after Zn vapor sorption treatment. Since the latter has a good thermal stability of magnetic property, the Zn vapor sorption treatment is expected to improve also the thermal stability of MQP-B magnet.

AB - The microstructural modification for NdFeB magnetic powders (MQP-B) after Zn vapor sorption has been investigated by transmission electron microscopy (TEM). It is found that a coating layer about 100 mn thick was formed on the surface of powder. Selected area electron diffraction (SAED) pattern and high resolution transmission electron microscopy (HRTEM) analyses show that the coating layer consists of condensed nano-scale crystallites of Fe11Zn40, NdZn5 and Zn. After the temperature for Zn vapor sorption is raised to 648 K, a thin layer has been formed on boundaries of Nd2Fe14B grains locally in the rim region of the powders. The morphology of the grain-boundary thin-layers is very similar to that in HDDR-NdFeB magnet powder after Zn vapor sorption treatment. Since the latter has a good thermal stability of magnetic property, the Zn vapor sorption treatment is expected to improve also the thermal stability of MQP-B magnet.

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Microstructural improvement of NdFeB magnetic powders by the Zn vapor sorption treatment

Abstract

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