Effect of La<sub>2</sub>O<sub>3</sub> on the Viscosity, Crystallization, and Structure of Calcium-silicate-based Mold Flux for Continuous Casting La-bearing FeCrAl Alloy

DOI Web Site 被引用文献2件 参考文献33件
  • Fan Lei
    Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University School of Metallurgy, Northeastern University
  • Liu Chengjun
    Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University School of Metallurgy, Northeastern University
  • Qi Jie
    Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University School of Metallurgy, Northeastern University
  • Jiang Maofa
    Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University School of Metallurgy, Northeastern University

この論文をさがす

説明

<p>The influence of La2O3 on the properties and structure of calcium-silicate-based mold flux for continuous casting La-bearing FeCrAl alloy was studied through employing rotating viscometer, SEM-EDS, XRD, and Raman spectroscopy. The results showed that the viscosity of mold fluxes decreased with the increase of La2O3 content from 0 mass% to 15 mass%. The apparent activation energy for viscous flow decreased from 108.56 ± 1.96 kJ/mol to 87.29 ± 7.29 kJ/mol with increasing La2O3. Deconvolution Raman analysis showed that with increasing La2O3, the mole fraction of Q3 units decreased, while that of Q0, Q1, and Q2 units increased. Furthermore, the values of NBO/Si increased from 1.27 to 1.83 with the increase of La2O3, which indicated that the degree of polymerization of melt structure was reduced and lead to the decrease of viscosity. During the cooling process, cuspidine (Ca4F2Si2O7) was the main crystalline phase in calcium-silicate-based mold fluxes. Nevertheless, when La2O3 was excessively added, a new phase of CaLa2(SiO4)2 was formed owing to the charge balance of Ca2+ and La3+ on the simple structural units Q0 ([SiO4]4−). Therefore, with increasing La2O3 can increase the break temperature and accelerate the formation of crystalline phases Ca4F2Si2O7 and CaLa2(SiO4)2 at high temperature.</p>

収録刊行物

被引用文献 (2)*注記

もっと見る

参考文献 (33)*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