Thermal Conductivity of R-Na2O-SiO2(R=Al2O3, CaO) Melts
Reliable values of thermal conductivity of molten silicates are strongly requested to establish a model which can describe the relationship between thermal conductivity and structure of the molten silicates. Thermal conductivity of Na2O-SiO2-CaO-Al2O3 molten slags has been measured by using the novel laser flash method. A thin platinum crucible was filled with silicate melt and the bottom surface of the platinum crucible at high temperature was irradiated by a pulsed laser. After irradiation, a temperature decay of the bottom surface of the platinum crucible was measured with an InSb infrared detector. The value of the thermal conductivity was determined by fitting the measured temperature response curve to theoretical one with a least square method. Measured thermal conductivity slightly depends on temperature in molten state with the chemical compositions of the slags presently investigated. On the other hand, the thermal conductivity was found to decrease with increasing NBO/T (Non-Bridging Oxygen ions / Tetrahedrally coordinated cation) values.
thermal conductivity molten silicate laser flash method
Ohta HIROMICHI Hiroyuki SHIBATA Hiroki HASEGAWA Takaya KOWATARI Yasuhiro SHIROKI Shin-Ya KITAMURA Yoshio WASEDA
Department of Materials Engineering, Ibaraki University, Hitachi, Japan 316-8511 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan 980 Graduate school of Science and Engineering, Ibaraki University, Hitachi, Japan 316-8511
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-7
2012-05-27(万方平台首次上网日期,不代表论文的发表时间)