Effect of CaO/SiO2 mass ratio and Li2O on structure and phase precipitation behaviors of CaO–SiO2–MgO–Al2O3 oxide inclusions
Source abstract
Abstract
The crystallization behaviors and structure of CaO-SiO 2-MgO-Al 2O 3 melts representing the oxide inclusions in Si-Mn-killed steel were investigated. Raman spectroscopy analysis indicates that the degree of polymerization of oxide melts is lowered with increasing the CaO/SiO 2 mass ratios or Li 2O contents. Lowering the CaO/SiO 2 mass ratios decreases the crystallization temperatures and suppresses crystallization of the oxide melts. Two crystalline phases precipitate (4CaO·MgO·Al 2O 3·3SiO 2 and 3CaO·MgO·2SiO 2 in sequence) during continuous cooling of oxide melts with the CaO/SiO 2 mass ratios of 1.55 and 1.15. Only one crystalline phase (4CaO·MgO·Al 2O 3·3SiO 2) was precipitated during the continuous cooling of the oxide melts with CaO/SiO 2 mass ratio of 0.77. The crystallization ability of oxide melts was retarded with increasing the Li 2O content. The crystalline phases precipitated sequentially are blocky 4CaO·MgO·Al 2O 3·3SiO 2 and faceted 3CaO·MgO·2SiO 2 irrespective of the Li 2O content of oxide melts.
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Research context
OpenAlex topics: Metallurgical Processes and Thermodynamics · Advanced ceramic materials synthesis · Materials Engineering and Processing
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