کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8004158 | 1516575 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural behavior of Fâ in mould flux melt of CaO-SiO2-Al2 O3-Na2 O-CaF2 system
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The influence of fluorine on the structure of CaO-SiO2-Al2O3-Na2O-CaF2 continuous-casting-type slag was measured by Raman spectroscopy, and the degree of polymerization of mould flux and the structural behavior of Fâ in the melt were investigated by classifying and quantifying the structural species of Fâ ions. The results exhibit that the main structural units of Si-O tetrahedra are Q0, Q1 and Q2 and the actual measured number of non-bridging oxygen ions in the [SiO4]-tetrahedra (denoted by NBO/T) increases from 2. 73 to 3. 44 with increasing the molar ratio of F to (F+O) (denoted by XF/X(F+O)) from 0. 06 to 0. 19. It means that the degree of polymerization of melt structure decreases with an increase in XF/X(F+O). In addition, most of Fâ ions were distributed in Si-O tetrahedra and Al-O tetrahedra. With increasing XF/X(F+O), the complex structural units Al-O tetrahedra are gradually replaced by discrete structural units AlF1- because of the breakage of Al-O bonds in Al-O tetrahedra by Fâ ions, and the Si-O (bridging oxygen) bonds of Si-O tetrahedra are broken to form [SiOnF1-n]-tetrahedra by Fâ ions coordinating with Si4+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Iron and Steel Research, International - Volume 24, Issue 11, November 2017, Pages 1152-1158
Journal: Journal of Iron and Steel Research, International - Volume 24, Issue 11, November 2017, Pages 1152-1158
نویسندگان
Qiang Gao, Yi Min, Cheng-jun Liu, Mao-fa Jiang,