金属粉末射出成形体の内部欠陥評価 Inner Defect Evaluation of Metal Injection Molded Specimens

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Inner defects of metal injection molded specimen at varied injection speed were investigated by secondary electron images, acoustic images, radiographs and finite element method.<BR>In particular, the inner defects occurred near gate, the shape and distribution state at low injection speed differed from high injection speed. We consider that the irregular tensile stress caused by shrinkage of crystallized polymer (polypropylene) as binder used in this study had occurred the inner defects. The shrinkage area of polymer with crystallized at cooling is differ at injection speed, and at termination of injection molding, the area is at center at low injection speed and is near capillary wall at high injection speed. At the area, the particle size and distribution of metal powder (SUS316L) were not uniform in scale of them. Therefore, tensile stress occurred partially among metal powders, the partial tensile stress causes the origin of crack.<BR>The results of comparison surface with inner defects of acoustic images show that inner defects exist under surface where compound consisted of metal powder and binder composition, changes as contrast of acoustic surface images.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 44(9), 851-857, 1997-09-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002014569
  • 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
    4304486
  • 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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