Thermal conductivity and structure of alkali silicate melts containing fluorides

Abstract

i.e. the number of non-bridging oxygens per tetradedrally Tokyo 152-8552 Japan; Professor Mills is in the Department coordinated atom. Thus, there is a possibility of estimating of Materials,

Effect of Crystallinity on Thermal Diffusivities of Mould Fluxes for the Continuous Casting of Steels

“…1) Thermal conductivities/diffusivities of liquid slags have been measured by different researchers. [2][3][4][5][6][7][8][9][10][11] They have reported the similar values of thermal conductivities although their temperature dependences are in disagreement with each other, that is, thermal conductivities measured by the hot-wire method have shown large negative temperature dependences, however, those measured by the laser flash method show the negligible or moderate positive or negative temperature dependences. With respect to the thermal conductivity/diffusivity of mould powders in the glassy and crystalline states, there are fewer previous reports available.…”

Thermal Conductivity of Molten Slags: A Review of Measurement Techniques and Discussion Based on Microstructural Analysis

“…24) After being initially adapted by Murase and McBirney to measuring the thermal conductivity of igneous materials, 25) Nagata and Susa further developed this technique in the early 1980s to apply to molten slag at high temperatures. 6,[26][27][28] Initially, the Na2O-SiO2 slag system was selected for thermal conductivity measurements, taking advantage of its relatively low melting point. 2,6,26,27,[30][31][32] Soon after, the hot wire method was also established for measuring the thermal conductivity of the CaO-Al2O3-SiO2, 7,[26][27][28] CaO-Al2O3-SiO2-MgO, 31) and CaO-SiO2-FeOx slag systems.…”

“…6,[26][27][28] Initially, the Na2O-SiO2 slag system was selected for thermal conductivity measurements, taking advantage of its relatively low melting point. 2,6,26,27,[30][31][32] Soon after, the hot wire method was also established for measuring the thermal conductivity of the CaO-Al2O3-SiO2, 7,[26][27][28] CaO-Al2O3-SiO2-MgO, 31) and CaO-SiO2-FeOx slag systems. 32,33) The fundamental measurement principle of the hot wire method can be described as follows: First, a thin thermoresistor wire is placed vertically in the middle of a molten sample.…”

“…1. 2,5) In spite of a number of integrated studies into the relationship between thermal conductivity and the structure of molten slags, 2,[5][6][7] further clarification is still necessary for a complete understanding. For example, recently reported analyses of the microstructure of various slag systems using Fourier Transform-Infrared Spectroscopy (FT-IR), Raman Spectroscopy, Nuclear Magnetic Resonance (NMR) might provide further insight into the relationship between structure and thermal conductivity.…”

“…As one of the most important thermophysical properties, the thermal conductivity of molten slag has received much attention over the past few decades with regards to ladle slags and the continuous casting mold flux of the steelmaking process. [1][2][3] Metallurgical slag is typically based on a silicate system, which is composed of ionic-bonded cations and covalentbonded anions. The slag composition is therefore expected to have a great influence on its microstructure and corresponding thermophysical properties.…”