Reduction of iron oxides in mould fluxes with additions of CaSi2

Min Wang, Rie Endo, Yoshinao Kobayashi, Zuoyong Dou, Masahiro Susa

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Iron oxides in mould fluxes enhance heat extraction from the molten steel to the mould due to energy absorption by d-d transitions of Fe2+ and re-emission. Thus, the existence of iron oxides is against mild cooling of molten steel. In this study, mould flux powders containing ca 2 mass% Fe2O3 were mixed with sufficient amounts of CaSi2. The mixtures were contained in alumina crucibles and melted at 1673 K in Ar-H2 atmosphere. The melts were poured into brass moulds to obtain glassy samples 5 mm thick. The Fe2O3 concentration was analysed by a scanning electron microscope with an energy dispersive spectrometer. The concentration decreased from ca 1.71 mass% to 0.49 mass% within 5 min and then settled down. Mass transfer of Fe2O3 is supposed to be the rate-controlling step at high temperature. The mass transfer coefficient has been calculated to be 1.8×10-3 cm・s-1, which seems reasonable. Since crystallisation of mould flux enhance heat reflection from the molten steel to reduce heat transfer, crystallisation kinetics of mould fluxes has been investigated using the Avrami equation, which suggests that additions of reducing agents such as CaSi2 suppress the crystallisation process. In addition, CaSi2 additions result in a dramatic decrease in the total radiative heat flux across mould fluxes in glassy state and would be effective for mild cooling of molten steel.

本文言語English
ホスト出版物のタイトルAdvances in Molten Slags, Fluxes, and Salts
ホスト出版物のサブタイトルProceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
編集者Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
出版社Springer International Publishing AG
ページ357-365
ページ数9
ISBN(印刷版)9783319486253
DOI
出版ステータスPublished - 2017
外部発表はい
イベント10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States
継続期間: 2016 5月 222016 5月 25

出版物シリーズ

名前Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016

Conference

Conference10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016
国/地域United States
CitySeattle
Period16/5/2216/5/25

ASJC Scopus subject areas

  • 機械工学
  • 材料力学
  • 材料化学
  • 金属および合金

フィンガープリント

「Reduction of iron oxides in mould fluxes with additions of CaSi2」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル