非水系バインダーによるスプレー造粒粉を用いたNd-Fe-B焼結磁石の磁気特性 Magnetic Properties of Nd-Fe-B Magnets Sintered Using Spray Dried Powders with Nonaqueous Binder

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Nd-Fe-B alloy powder was granulated by a spray drying method using an organic binder in order to improve the powder flowability during feeding and compacting. In this experiment, the organic binder consisted of poly(methyl methacrylate) (PMMA) and di-n-butyl phthalate, and 1, 4-dioxane as a solvent was used in granulating process, to suppress the residual moisture content in granulated powders and the reaction of alloy powders with its moisture, which result in marked degradation in powder characteristics and magnetic characteristics, respectively. By increasing the additional polymer content, powder characteristics were improved. However in comparison with the case of aqueous binder consisted of poly(vinyl alcohol) (PVA) and plasticizer, powder characteristics lowered slightly because of lower tensile strength of PMMA than PVA. In the case of PMMA the residual moisture contents in granulated powders were much smaller than those of PVA, independently of additional polymer content. The residual oxygen contents of green bodies after debinding were also smaller than those obtained using PVA. By using PMMA the magnetic characteristics (remanences and maximum energy product) of sintered magnets were improved remarkably, as compared with those of PVA. These facts mean that the high magnetic characteristics would be caused by both using low tensile strength polymer and restraining oxidation reaction of alloy powders.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(4), 373-378, 1998-04-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015524
  • 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
    4459423
  • 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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