The solubility of carbon and nitrogen in the CaF2-CaO-SiO 2-Al2O3 slag system was studied. The effects of the CaF2, extended basicity (CaO/(SiO2 + Al 2O3)), and atmospheric conditions on the dissolution behavior of the carbon and nitrogen, as well as the correlations of the behaviors with the slag structure observed at 1773 K (1500 C), are presented. Increases in the extended basicity and the CaF2 increased the solubility of carbon in the slag. In the case of nitrogen dissolution, a characteristic parabolic curve with an identifiable minimum was observed for the slag. This curve shape correlated with a change in the dominant mechanism of dissolution from an incorporated to a free nitride. The solubility of carbon in the mixture of CO with N2 was significantly higher than that of carbon in the mixture of CO with Ar and is likely due to the formation of cyanide. Thus, when carbon is present in significant quantities in the slag, the solubility of nitrogen in the slag increases. The degree of depolymerization of the slag with increased content of CaO/(SiO2 + Al2O 3) and CaF2 was verified using Fourier transform infrared and Raman spectroscopy.
|Number of pages||10|
|Journal||Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science|
|Publication status||Published - 2013 Feb|
Bibliographical noteFunding Information:
This study was partially supported by the Brain Korea 21 (BK21) Project at the Division of the Humantronics Information Materials, the National Science Foundation of Korea Project No. 2012-8-0486 and the Priority Research Centers Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2009-0093823).
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry