Ni-PSZ傾斜機能材料の作製とその内部欠陥観察 Fabrication of Ni-PSZ FGM by Pulse discharge Sintering and Observation of its Internal Defects

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Functionally graded materials (FGM), composed of zirconia and nickel system, were sintered from laminated mixtures by the pulse discharge sintering method (PDS). The partially stabilized zirconia (Y<SUB>2</SUB>O<SUB>3</SUB>-3mol%, size; 0.8μm) and nickel (size; 5μm) were mixed at 90, 80, 60, 40vol%PSZ in a ceramic ball mill for 2 hours with ethanol. These mixtures and two pure materials were laminated in a mold made of graphite. The designed thickness of each layer varies from 0.2mm to 2mm. The different thickness FGM specimens were sintered. These were evaluated by the ultrasonic imaging, and also observed by the optical microscope at the cross section. By the microscope, it was found that the matrix of the FGM specimens consisted of zirconia and very fine nickel particles dispersed in the matrix. In some FGM, ultrasonic images showed no clear defect in all interfaces at just after sintering, however after about 2 weeks, slight defect images were recognized, then the defect changed to the crack image after about 2 months. To know the mechanism of the change, 3 kinds of 2 layers sintered samples (90/80, 80/60, 90/60vol%PSZ) were fabricated, these samples were examined by ultrasonic imaging after each thermal treatment. As the results, it was observed that some of defects gradually propagated to inside, then finally changed to large cracks or a delamination.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(11), 1071-1075, 1998-11-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002053255
  • 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
    4608381
  • 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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