加熱中における無添加β‐SiC圧粉体の微構造変化

書誌事項

タイトル別名
  • Microstructure Development of Undoped Compact of β-SiC during Heating
  • カネッチュウ ニ オケル ムテンカ ベータ SiC アップンタイ ノ ビ コウ

この論文をさがす

抄録

Compacts of highly pure β-SiC powder with an average size of about 0.1μm were heated up to 2100°C at a heating rate of 5.5°C/min in helium (O2<1ppm and dew point -74°C). Although no apparent shrinkage was observed on the compacts, scanning and transmission electron microscopic observation revealed remarkable microstructural changes during the heating.<br>The results obtained were as follows:<br>(1) After heating up to 1630°C, joining and coalescence among particles were observed in the compact. It was found that the coalesced grain was polycrystalline and consisted of many differently oriented grains, of which size was in the range of 0.1 to 0.3μm.<br>(2) In the compact heated up to 1900°C, the grain growth by about ten times in size was observed, although extensive morphological change among particles occurred without appreciable grain-boundary migration.<br>(3) During heating up to 2100°C, some parts of the compact was densified almost to its theoretical density, and development of pores took place in other parts. Thus no densification occurred as a whole.<br>(4) A distribution of dihedral angles was measured from the transmission electron micrographs, and the most frequently observed angle was 92°, which gave a value of 1.39 as the ratio of grain-boundary energy to surface energy. This suggests that virtually no thermodynamic limitation would exist for densification of SiC.

収録刊行物

  • 窯業協會誌

    窯業協會誌 87 (1006), 317-321, 1979

    公益社団法人 日本セラミックス協会

被引用文献 (3)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ