Residual hydrogen in Nd-Fe-B HDDR powder and its effect on coercivity of hot-pressed compact

Md Abdul Matin; Hae Woong Kwon; Jung Goo Lee; Ji Hun Yu; Tae Hoon Kim; Cheol Woong Yang

doi:10.1109/TMAG.2013.2243118

Residual hydrogen in Nd-Fe-B HDDR powder and its effect on coercivity of hot-pressed compact

Md Abdul Matin, Hae Woong Kwon, Jung Goo Lee, Ji Hun Yu, Tae Hoon Kim, Cheol Woong Yang

Department of Advanced Materials Science and Engineering

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

7 Scopus citations

Abstract

Residual hydrogen in the HDDR-treated Nd_12.5Fe _80.6B_6.4Ga_0.3Nb_0.2 powder and its effect on the coercivity of consolidated compact of the powder were investigated. Hydrogen desorption of the HDDR powder was studied by vacuum gauge and TPA. Compaction of the HDDR powder was performed by hot-pressing technique. The Nd_12.5Fe_80.6B_6.4Ga_0.3Nb _0.2 HDDR powder contained significant amount of residual hydrogen (approximately 1520 ppm). Coercivity of the hot-pressed compact was radically reduced when the compaction was performed at the temperature above 650°C. The radical coercivity reduction in the compact hot-pressed above 650°C was attributed to the presence of the soft magnetic phases, α -Fe and Fe ₂B formed via disproportionation of the Nd₂Fe ₁₄BH_x. The residual hydrogen may have contributed for the formation of Nd₂Fe₁₄BH_x.

Original language	English
Article number	6559301
Pages (from-to)	3398-3401
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	49
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2013.2243118
State	Published - 2013

Keywords

Coercivity
disproportionation
HDDR
hot-pressing
residual hydrogen

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title = "Residual hydrogen in Nd-Fe-B HDDR powder and its effect on coercivity of hot-pressed compact",

abstract = "Residual hydrogen in the HDDR-treated Nd12.5Fe 80.6B6.4Ga0.3Nb0.2 powder and its effect on the coercivity of consolidated compact of the powder were investigated. Hydrogen desorption of the HDDR powder was studied by vacuum gauge and TPA. Compaction of the HDDR powder was performed by hot-pressing technique. The Nd12.5Fe80.6B6.4Ga0.3Nb 0.2 HDDR powder contained significant amount of residual hydrogen (approximately 1520 ppm). Coercivity of the hot-pressed compact was radically reduced when the compaction was performed at the temperature above 650°C. The radical coercivity reduction in the compact hot-pressed above 650°C was attributed to the presence of the soft magnetic phases, α -Fe and Fe 2B formed via disproportionation of the Nd2Fe 14BHx. The residual hydrogen may have contributed for the formation of Nd2Fe14BHx.",

keywords = "Coercivity, disproportionation, HDDR, hot-pressing, residual hydrogen",

author = "Matin, \{Md Abdul\} and Kwon, \{Hae Woong\} and Lee, \{Jung Goo\} and Yu, \{Ji Hun\} and Kim, \{Tae Hoon\} and Yang, \{Cheol Woong\}",

year = "2013",

doi = "10.1109/TMAG.2013.2243118",

language = "English",

volume = "49",

pages = "3398--3401",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

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T1 - Residual hydrogen in Nd-Fe-B HDDR powder and its effect on coercivity of hot-pressed compact

AU - Matin, Md Abdul

AU - Kwon, Hae Woong

AU - Lee, Jung Goo

AU - Yu, Ji Hun

AU - Kim, Tae Hoon

AU - Yang, Cheol Woong

PY - 2013

Y1 - 2013

N2 - Residual hydrogen in the HDDR-treated Nd12.5Fe 80.6B6.4Ga0.3Nb0.2 powder and its effect on the coercivity of consolidated compact of the powder were investigated. Hydrogen desorption of the HDDR powder was studied by vacuum gauge and TPA. Compaction of the HDDR powder was performed by hot-pressing technique. The Nd12.5Fe80.6B6.4Ga0.3Nb 0.2 HDDR powder contained significant amount of residual hydrogen (approximately 1520 ppm). Coercivity of the hot-pressed compact was radically reduced when the compaction was performed at the temperature above 650°C. The radical coercivity reduction in the compact hot-pressed above 650°C was attributed to the presence of the soft magnetic phases, α -Fe and Fe 2B formed via disproportionation of the Nd2Fe 14BHx. The residual hydrogen may have contributed for the formation of Nd2Fe14BHx.

AB - Residual hydrogen in the HDDR-treated Nd12.5Fe 80.6B6.4Ga0.3Nb0.2 powder and its effect on the coercivity of consolidated compact of the powder were investigated. Hydrogen desorption of the HDDR powder was studied by vacuum gauge and TPA. Compaction of the HDDR powder was performed by hot-pressing technique. The Nd12.5Fe80.6B6.4Ga0.3Nb 0.2 HDDR powder contained significant amount of residual hydrogen (approximately 1520 ppm). Coercivity of the hot-pressed compact was radically reduced when the compaction was performed at the temperature above 650°C. The radical coercivity reduction in the compact hot-pressed above 650°C was attributed to the presence of the soft magnetic phases, α -Fe and Fe 2B formed via disproportionation of the Nd2Fe 14BHx. The residual hydrogen may have contributed for the formation of Nd2Fe14BHx.

KW - Coercivity

KW - disproportionation

KW - HDDR

KW - hot-pressing

KW - residual hydrogen

UR - https://www.scopus.com/pages/publications/84880778995

U2 - 10.1109/TMAG.2013.2243118

DO - 10.1109/TMAG.2013.2243118

M3 - Article

AN - SCOPUS:84880778995

SN - 0018-9464

VL - 49

SP - 3398

EP - 3401

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 7

M1 - 6559301

ER -

Residual hydrogen in Nd-Fe-B HDDR powder and its effect on coercivity of hot-pressed compact

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Keywords

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