Magnetic Properties of Nd-Fe-B Magnets Sintered Using Granulated Powders by Spray Drying Method (III).

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  • Kishimoto Yoshihisa
    Advanced Technology Research Laboratories, Sumitomo Metal Industries Ltd.
  • Yamashita Osamu
    Research & Development Development Department, Sumitomo Special Metals Co. Ltd.

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  • スプレー造粒粉を用いたＮｄ－Ｆｅ－Ｂ焼結磁石の磁気特性（ＩＩＩ）
  • スプレー ゾウリュウ フン オ モチイタ Nd Fe B ショウケツ ジシャク

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Abstract

Nd-Fe-B alloy powder was granulated by spray drying method using organic binder consisted of polyvinylalcohol (PVA) or carboxymethylcellulose (CMC) with different tensile strength, in order to improve the powder flowability during feeding and compacting. The relationships between binder composition, polymer/plasticizer ratio and content of binder, and granulated powder characteristics or magnetic characteristics were investigated. By using a polymer with high tensile strength, the bonding strength between alloy powders increased, so that the powder flowability of granulated powders was improved. After compacting these powders in a magnetic field, compacted bodies were heated at 673K in H2. About 96% of carbon in binder was removed, although the oxygen in binder remained. In the case of high tensile strength polymer, remanences (Br) of sintered magnets decreased by about 20%, as compared with those of low tensile strength one. However, by increasing the plasticizer content in organic binder both of Br and maximum energy product (BH)max were improved remarkably.

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