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- W2015093035 abstract "We have successfully developed a Dy-free grain boundary diffusion process with neodymium hydride (NdHx) alloy to the permanent magnet Nd2Fe14B powders using hydrogenation – disproportionation – desorption – recombination (HDDR) method. All the diffusion treatments were performed at 700–800 °C for various annealing time under the high vacuum with rotating diffusion method that effectively control the abnormal grain growth. The coercivities of Dy-treated Nd2Fe14B powders were varied from 9.5 kOe to 13.2 kOe but the remanence was decreased to 8.1 kG (10% reduction) depending on dysprosium hydride (DyHx) content and diffusion treated time. However, the coercivity and remanence of Dy-free diffusion treated powder have been increased to 12.2 kOe (28.5% enhancement) and 11.1 kG (22% enhancement) at the optimal diffusion treatment (800 °C for 3 h), respectively. This unique simultaneous enhancement is to isolate the magnetic coupling between Nd2Fe14B grains by creating non-magnetic Nd grain boundaries and enhance the alignment of the Nd2Fe14B hard magnetic phase, fabricated by optimal diffusion conditions." @default.
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- W2015093035 date "2015-04-01" @default.
- W2015093035 modified "2023-10-02" @default.
- W2015093035 title "Simultaneous enhancement in coercivity and remanence of Nd2Fe14B permanent magnet by grain boundary diffusion process using NdHx" @default.
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- W2015093035 doi "https://doi.org/10.1016/j.cap.2015.01.025" @default.
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