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No.1(pp.1-51)

Home > Issues > Volume 14 (2009) > No.1(pp.1-51)

High Coercive Nd-Fe-B Sintered Magnets for High Temperature Application

Journal of Magnetics, Volume 14, Number 1, 31 Mar 2009, Pages 27-30

D.H. Kim(Jahwa Electronics Co.), A.S. Kim(Jahwa Electronics Co.), T.H. Lim(Department of Hybrid Engineering, Sunmoon University), T.S. Jang*

(Department of Hybrid Engineering, Sunmoon University)

Abstract

Various sintered magnets containing 28~31ωt% Nd and 0~7ωt% Dy were evaluated for coercivity and irreversible flux loss as a preliminary study to develop highly-coercive, high-temperature magnets that can be applied for driving motors in a hybrid vehicle. The sintered magnets were prepared in sequence of strip casting, HD treatment, jet milling, magnetic field pressing, sintering and post-annealing. Increasing Dy content and adjusting post-annealing temperature monotonically increased coercivity of magnets from about 14 kOe to 30 kOe. A magnet containing 28 wt% Nd and 7 wt% Dy exhibits a(BH)_msa + _iH_cvalue of almost 64. This is very close to what the automobile industry considers as the minimum value (65) for a hybrid vehicle system. Moreover, irreversible flux loss of the magnet was about 3% at 200 °C , which is well less than the allowable limit (5%) to a driving motor in hybrid vehicles.

Keywords: Nd-Fe-B; coercivity; thermal stability; irreversible flux loss

DOI: 10.4283/JMAG.2009.14.1.27

Full Text: PDF

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