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

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Nd-Fe-B alloy powder was granulated by a spray drying method using organic binder consisted of polyvinylalcohol or cellulose ethers, in order to improve the powder flowability during feeding and compacting. The compressing behavior of Nd-Fe-B granulated powders was investigated. In the case of granulated powders, the relation between compressing stress and powder bulk density was expressed by two straight lines containing one bending point, and the compressing stress on this point was defined as the average destruction strength(ADS). The ADS was closely related with the tensile strength of organic binder. By means of controlling the tensile strength of binder by changing its composition or polymer/plasticizer ratio, the ADS could be designed easily. In the case that the ADS was less than about 0.1N/mm<SUP>2</SUP>, the powder flowability of granulated powder was improved with increasing the ADS, whereas in the case of more than about 0.1N/mm<SUP>2</SUP>, it showed almost constant value. The magnetic characteristics (remanences and maximum energy product) of sintered magnets using granulated powders were improved proportionally with decreasing the ADS, which was independent of any kinds of polymers and binder composition. These facts mean that the degree of the magnetic orientation of primary particles in granulated powders under a magnetic field can be determined simply by the ADS.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 44(10), 951-957, 1997-10-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002261572
  • 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
    4324260
  • 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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