Temperature feature of NdDyFeB magnets with ultrahigh coercivity

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347984· OSTI ID:5810002

Gong, W; Li, Q; Yin, L ^[1]

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1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China (CN)

The intrinsic coercivities {ital H}{sub {ital c}} of Nd{sub 14}Dy{sub {ital x}}Fe{sub 79{minus}{ital x}}B{sub 7} magnets, prepared by a powder metallurgical method, with an addition of Dy ({ital x}=2 at. %), reached 21 kOe. The intrinsic coercivity {ital H}{sub {ital c}} was kept over 10 kOe when the heating temperature was 150 {degree}C and the temperature coefficient {alpha}({ital H}{sub {ital c}}) = {minus}0.35%/{degree}C was in a temperature range of 16--150 {degree}C. After aging at 120 {degree}C for 400 h, the intrinsic coercivities {ital H}{sub {ital c}} and magnetic energy products ({ital BH}){sub max} of the magnets did not change as usual, remaining at {ital H}{sub {ital c}} = 21 kOe and ({ital BH}){sub max} = 30 MGOe. The NdFeB magnets with all kinds of the intrinsic coercivities were compared at various temperatures also. The experimental results show that high-temperature features of the NdFeB magnets were improved by increasing the intrinsic coercivity.

• OSTI ID: 5810002
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

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DYSPROSIUM COMPOUNDS
IRON BORIDES
IRON COMPOUNDS
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METALLURGY
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