ホットプレスSi<SUB>3</SUB>N<SUB>4</SUB>における破壊靭性と曲げ強度との相関

DOI Web Site Web Site 被引用文献6件 参考文献51件

書誌事項

タイトル別名
  • Relation between Fracture Toughness and Strength in Si<SUB>3</SUB>N<SUB>4</SUB> Ceramics
  • ホットプレスSi3N4における破壊靭性と曲げ強度との相関
  • ホット プレス Si3N4 ニ オケル ハカイ ジンセイ ト マゲ キョウド
公開日
1995
DOI
  • 10.2320/jinstmet1952.59.8_862
公開者
公益社団法人 日本金属学会

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説明

The relationship between fracture toughness and bending strength in Si3N4 ceramics was studied. Three-point bending tests were carried out. The fracture toughness was estimated by the single edge precracked beam method. Grain morphology was observed using transmission microscopy.<BR>The fracture toughness increased with grain growth. The strength increased with fracture toughness up to KIC=7 MPam0.5 and decreased in spite of increasing fracture toughness over 7 MPam0.5.<BR>The linear elastic fracture mechanics is not applicable to small cracks in ceramics. Because of this, the effective crack size for fracture is not equal to the original equivalent crack length. In order to elucidate the fracture toughness-strength relation, the effective crack size must be estimated. In the previous work, the tendency in the crack size-strength relation was explained by adding a material-dependent constant to the original equivalent crack length. But this constant was not related to the physical process of fracture and was calculated according to the experimental results. In this study, the effective crack size of fracture origin was estimated experimentally and the fracture toughness-strength relation was investigated using the effective crack size.<BR>The increase in strength up to 7 MPam0.5 resulted from a constant effective crack size. The decrease in strength over 7 MPam0.5 was due to both the increase in fracture toughness by the R-curve behavior and the increase in effective crack size.

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  • 日本金属学会誌

    日本金属学会誌 59 (8), 862-868, 1995

    公益社団法人 日本金属学会

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