スプレー造粒粉を用いたNd-Fe-B焼結磁石の磁気特性(II) Magnetic Properties of Nd-Fe-B Magnets Sintered Using Granulated Powders by Spray Drying Method (II)

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Nd-Fe-B alloy powder was granulated by spray drying method using methylcellulose (MC) binder in the range from 0.1 to 0.5wt%, in order to improve the powder flowability during feeding and compacting. After adding MC binder, glycerin and pure water to alloy powder, the slurry was stirred at 278K in N<SUB>2</SUB> atmosphere to suppress the oxidation of alloy powder. The granulated powders with MC binder exhibited higher flowability than granulated powders with polyvinylalcohol(PVA) binder. By heating in H<SUB>2</SUB> at 673K after compacting in a magnet field, 96% of carbon in binder was removed, although the oxygen in binder remained unremoved. With the compacted body added 0.20wt% MC, these treatments can allow to suppress the residual contents of oxygen and carbon in the resulted sintered magnets within less than 8500ppm and 600ppm, respectively. The coercive force(iHc) and maximum energy product (BH) <SUB>max</SUB> for a sintered anisotropic magnet prepared by the above mentioned process are 0.96(MA/m) and 241.1 (kJ/m<SUP>3</SUP>), respectively, in which (BH)<SUB>max</SUB> is lower by 15% than that obtained by using PVA binder.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(5), 675-681, 1996-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012317
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    3967180
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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