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Improved mechanical properties and thermal stability of Sm-Co high temperature magnets resulting from surface modifications are reported. Compared to un-modified magnets, the modification with 15 μm sulfamate-Ni plating improved the fracture toughness by 76% and the thermal stability by 143% in vacuum and 861% in air for aging at 500 °C for up to 3000 hours. Microstructures of some specimens with...
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