金属/セラミックス系焼結傾斜機能材料の熱衝撃き裂伝播機構 Mechanism of Thermal Shock Crack Extension in Metal/Ceramic Sintered Functionally Graded Materials

この論文にアクセスする

この論文をさがす

著者

抄録

The thermal shock fracture mechanism of metal/ceramic functionally graded materials was studied by burner heating test. Dependence of thermal shock crack initiation and propagation on controlled compositional gradients was virtually shown and discussions were made on the basis of fracture mechanics with special reference to the effect of compositional profile on crack extension behavior. Three types of FGMs, having the same thickness of graded layer with different compositional profiles, were fabricated by powder metallurgical process. The fracture toughness of each composition was determined by newly devised repeated vickers indentation method directly on FGM specimens. The fracture toughness increased with, increase in the metal phase content, owing to toughening mechanisms of thermal-strain-misfit and crack deflection. The FGMs were joined on cooling substrates and used for burner heating test. The crack formation was always observed on the ceramic surface during cooling due to large residual tensile stresses. By comparison between the fracture toughness and mode I stress intensity factor, vertical cracks in convex-profile FGMs were deflected toward the direction parallel to the surface. The depth of the parallel cracks beneath the surface may correspond well to a location of mode II stress intensity being equal to zero. On the other hand, initiated vertical cracks in concave-profile FGMs were considered to arrest without deflection.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(3), 295-299, 1996-03-15 

    Japan Society of Powder and Powder Metallurgy

参考文献:  11件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10002011531
  • 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
    3936693
  • 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  NDL  J-STAGE 
ページトップへ