Simultaneous enhancement of the coercivity and remanence at high temperatures in a sintered Nd-Fe-B magnet after grain boundary diffusion with Dy60Co40 alloy

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.08.012· OSTI ID:22833007

Chen, Fugang ^[1]; Zhang, Lanting ^[2]; Jin, Yunxue; Cheng, Ye ^[1]

---

1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003 (China)
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240 (China)

Highlights: • Dy and Co enriched shells were formed on the Nd{sub 2}Fe{sub 14}B grain boundaries. • Coercivity and remanence were increased simultaneously at high temperatures. • Remanence stability was improved with little change of the Curie temperature. - Abstract: The grain boundary diffusion process (GBDP) using Dy{sub 60}Co{sub 40} alloy was applied to a sintered Nd-Fe-B magnet. After GBDP the temperature stability of remanence was improved greatly with the remanence temperature coefficient improving from −0.140%/°C to −0.095%/°C while the Curie temperature increased marginally. Both the coercivity and remanence were increased simultaneously at high temperatures. Microstructure and composition analysis revealed that Dy and Co enriched shells were formed on Nd{sub 2}Fe{sub 14}B grain boundaries after GBDP. The Dy enriched shell increased the coercivity while the Co enriched shell decreased the temperature sensitivity of remanence and then increased the remanence at high temperatures.

• OSTI ID: 22833007
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 144; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
BORON COMPOUNDS
COBALT COMPOUNDS
COERCIVE FORCE
CURIE POINT
DIFFUSION
DYSPROSIUM COMPOUNDS
GRAIN BOUNDARIES
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETS
NEODYMIUM COMPOUNDS
SENSITIVITY
TEMPERATURE COEFFICIENT
TERNARY ALLOY SYSTEMS