SiCウイスカー/Al<sub>2</sub>O<sub>3</sub>複合材料の力学的性質に及ぼすウイスカー形状・寸法の影響

DOI Web Site Web Site 被引用文献4件

書誌事項

タイトル別名
  • Influence of Whiskers' Shape and Size on Mechanical Properties of SiC Whisker-Reinforced Al<sub>2</sub>O<sub>3</sub>
  • SiC ウイスカー Al2O3 フクゴウ ザイリョウ ノ リキガクテキ セイシ

この論文をさがす

抄録

For whisker reinforced ceramic composites, many toughening mechanisms are proposed. However, it is not clear yet which mechanism mainly contributes to the toughening. In this paper, we tried to explain the toughening behavior by the pull-out mechanism. A model based on the energy balance of crack propagation and frictional energy during whisker pulling-out was constructed for analyzing experimental results. Seven types of SiC whiskers with various sizes and shapes were used for fabricating SiC whisker/Al2O3 composites. Mechanical properties of these composites such as frature toughness KIC, effective fracture energy γeff and 4-point bending strength σf, were measured as a function of whisker dimension or whisker volume fraction. Fractured surfaces and crack propagation paths in these composites were observed in detail. A linear relationship between γeff and r2/lw was obtained (r: radius of whiskers, lw: length of whiskers). γeff also had a linear relationship with the whisker volume fraction. These results seem to support the whisker pull-out model proposed here. (KIC)2 showed linear relationships with r2/lw and whisker volume fraction as well as γeff. Four-point bending strengths of these composites were not improved in spite of toughening by whisker reinforcement. It is presumed that long whiskers cause to introduce large defects into ceramic matrix.

収録刊行物

被引用文献 (4)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ