熱間加工型異方性Nd-Fe-Bボンド磁石

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Isotropic Nd-Fe-B bonded magnets, which are widely used in various instruments, have (BH)max of 5 ~ 12 MGOe. It is required to enhance the (BH)max of bonded magnet for a development of its new applications. In this study, the hot-upsetting of Nd-Fe-B powder packed into a metal container has been tried in order to simplify the production process of anisotropic powder, and to enhance its hard magnetic properties. Consequently, it was found that the high-performance anisotropic powder was obtained by the relatively simple production process. This hot-formed anisotropic powder material is thought to be the promising candidate for the high-performance bonded magnet. Results obtained in this study are as follows: (1) High (BH)max powder was obtained by the direct hot-upsetting of Nd-Fe-B quenched powder packed in the iron container. (2) Alignment of the Nd2Fe14B crystals; enhancement of the (BH)max , occurred effectively in the hot-upsetting at 750 ~ 850 °C. (3) The (BH)max of the upset Nd-Fe-B powder increased with increasing the percent reduction of the iron container in the hot-upsetting, and saturated around 85 % of the percent reduction. The saturated (B H)max of the upset Nd0.137Fe0.735Co0.067B0.055Ga0.006powder was about 38 MGOe, being enough value to show high performance as an anisotopic bonded-magnet. (4) Compression-molded Nd 0.137 Fe0.735Co0.067B0.055Ga0.006bonded-magnet showed the following magnetic properties: Br = 9.51 kG,iHc = 14.3 kOe, and (BH)max = 20.5 MGOe. Compression-molded Nd0.130Dy0.016Fe0.726Co0.068B0.054Ga0.006 bonded-magnet showed the following magnetic properties: Br = 8.15 kG,iHc = 21.2 kOe, and (BH)max = 15.4 MGOe. (5) Temperature coefficients of B r and i H c of the compression-molded Nd0.137Fe0.735Co0.067B0.055Ga0.006 bonded-magnet were -0.096 %/°Cand -0.46 %/°C, respectively.
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熱間加工型異方性Nd-Fe-Bボンド磁石

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