低酸素分圧下での赤色粘土の焼成時における酸素の放出と鉄の化学状態変化

• 高橋 秀典

  京都工芸繊維大学工芸学部物質工学科

• 竹内 信行

  京都工芸繊維大学工芸学部物質工学科

• 石田 信伍

  京都工芸繊維大学工芸学部物質工学科

• 若松 盈

  大光炉材 (株)

書誌事項

タイトル別名

• Oxygen Evolution and Chemical State Changes of Iron during Firing of Red Clay Bodies at Low Oxygen Pressure.

抄録

A red clay body containing 7mass% Fe₂O₃ was fired at PO₂=0.1kPa and its bloating and blackening mechanisms were investigated.<br>Blackening started at around 1100°C and the Fe²⁺/total Fe ratio in the fired body was about 5%. The disappearance of open pores started at about 1200°C, and the sealed porosity began to increase above 1200°C. The Fe²⁺/total Fe ratio in the body fired at 1200°C was 16%, indicating that a considerable amount of oxygen had been released. Although the evolution of oxygen started at around 1100°C as judged from the results of chemical analysis of Fe, the evolution of oxygen was detected only at around 1080°C and at the soaking temperatures probably due to the high heating rate (5°C/min).<br>The results of thermodynamic calculations suggested that oxygen evolution was caused or at least assisted by the reaction of iron oxides with Al₂O₃ to form FeAl₂O₄, a stable spinel. It is, however, assumed that FeAl₂O₄ reacted with silicate compounds during sintering at high temperatures.

収録刊行物

• Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)

  Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 108 (1260), 705-709, 2000

  公益社団法人 日本セラミックス協会

キーワード

• Red clay
• Reducing atmosphere
• Blackening
• Bloating
• Electron spin resonance

詳細情報

• CRID: 1390282680224180096
• NII論文ID: 110002289885
• NII書誌ID: AN10040326
• DOI: 10.2109/jcersj.108.1260_705
• ISSN: 18821022
• ISSN: 09145400
• NDL書誌ID: 5433732
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5433732
• Web Site: http://www.jstage.jst.go.jp/article/jcersj1988/108/1260/108_1260_705/_pdf
• 本文言語コード: en
• 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