Si₃N₄-Y₂O₃/Al₂O₃常圧焼結体の粒子形態が及ぼす水熱条件下での溶出挙動への影響

• 吉尾 哲夫

  岡山大学工学部非結晶材料研究施設

• 小田 耕平

  米子工業高等専門学校

• 小田 喜一

  岡山大学工学部非結晶材料研究施設

書誌事項

タイトル別名

• Effect of Grain Morphology in Pressureless-Sintered Si₃N₄-Y₂O₃/Al₂O₃ on Leaching Behavior under Hydrothermal Conditions
• Si3N4 Y2O3 Al2O3 ジョウアツ ショウケツタイ ノ リュウシ ケ

抄録

The purpose of this work is to study the effect of grain morphology in sintered Si₃N₄ on the leaching behavior under hydrothermal conditions. The pressureless-sintered Si₃N₄-Y₂O₃/Al₂O₃ specimens were produced using two kinds of commercial grade Si₃N₄ powders, i.e., prepared by the imide-decomposition method (specimen-A) and the silicon-nitridation method (specimen-B). Differences in microstructures were observed for sintered specimens from these Si₃N₄ starting powders, i.e., specimen-A resulted in a finer microstructure than specimen-B. Leaching test was carried out using an autoclave under the hydrothermal conditions at 300°C and 8.6MPa for 1-10 days. The two specimens showed the similar trend of weight loss in leaching test, but larger weight loss was measured in specimen-B in the whole leaching time. A parabolic plot of weight loss suggested that the leaching mechanism consisted of two stages. SEM observation revealed that the both leached layers consisted of porous layer at the first stage and flakes on it at the second stage. The porous layer for specimen-A was finer than that for specimen-B and the traces of machining grooves was still visible on both porous layers. The results of this experiment showed that the leaching weight loss of sintered Si₃N₄ under hydrothermal conditions and the microstructures of the leached layer depended remarkably on the microstructural grain morphology of the sintered body generated by the starting powders and also on its mechanical history by grinding.

収録刊行物

• 窯業協會誌

  窯業協會誌 95 (1100), 435-441, 1987

  公益社団法人 日本セラミックス協会

キーワード

• Pressureless-sintered Si₃N₄
• Leaching behavior
• Hydrothermal condition
• Autoclave
• Imide-decomposition method
• Silicon-nitridation method
• Microstructural grain morphology
• Machining groove

詳細情報

• CRID: 1390001205248724480
• NII論文ID: 110002313619
• NII書誌ID: AN00245650
• DOI: 10.2109/jcersj1950.95.1100_435
• ISSN: 18842127
• ISSN: 00090255
• NDL書誌ID: 3131800
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3131800
• Web Site: http://www.jstage.jst.go.jp/article/jcersj1950/95/1100/95_1100_435/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可