Surface-engineered grain-boundary diffusion in thick NdFeB magnets enabling interfacial phase control and resource-efficient enhancement of coercivity and corrosion resistance

Ching-Chien Huang

doi:10.1016/j.surfcoat.2026.133683

Surface-engineered grain-boundary diffusion in thick NdFeB magnets enabling interfacial phase control and resource-efficient enhancement of coercivity and corrosion resistance

2026-06-16

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Ching-Chien Huang *

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Chih-Chieh Mo

DOI：10.1016/j.surfcoat.2026.133683

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• A single-stage Dy diffusion route upgrades thick NdFeB magnets efficiently. • Interface-engineered shell phases enable dual magnetic and corrosion gains. • 5.5 and 6.5 mm magnets reached iHc of 25.78 and 25.06 kOe, respectively. • High coercivity was achieved with Dy consumption below 0.12 wt%. • Surface-driven grain-boundary control avoids conventional bulk HRE alloying.

Surface-engineered grain-boundary diffusion in thick NdFeB magnets enabling interfacial phase control and resource-efficient enhancement of coercivity and corrosion resistance

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