Thermal Conductivity Measurements of Some Synthetic Al2O3-CaO-SiO2 Slags by Means of a Front-Heating and Front-Detection Laser-Flash Method
Thermal Conductivity Measurements of Some Synthetic Al2O3-CaO-SiO2 Slags by Means of a Front-Heating and Front-Detection Laser-Flash Method
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DOI：
10.1007/s11663-012-9702-y
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发表时间：
2012-08
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影响因子：
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通讯作者：
H. Hasegawa;Yasuhiro Hoshino;Takeshi Kasamoto;Yu Akaida;Takaya Kowatari;Yasuhiro Shiroki;H. Shibata;H. Ohta;Y. Waseda
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作者：
H. Hasegawa;Yasuhiro Hoshino;Takeshi Kasamoto;Yu Akaida;Takaya Kowatari;Yasuhiro Shiroki;H. Shibata;H. Ohta;Y. Waseda
采用前沿探测激光闪光法测定了一些含Al_2O_3、CaO和SiO_2的合成渣在1623℃(1350℃)到1823℃(1550℃)的温度范围内的热导率。在这种方法中，温度响应曲线是在激光脉冲照射后的短初始时间段内测量的。用这种方法得到的结果值不受辐射换热的影响。对于目前研究的所有炉渣样品，导热值的温度依赖性并不显著。样品的热导率(λ)以小于其值的2%的标准偏差表示为组成的函数如下：$$\lambda=-0.48\Left[{{\Text{Al}}_{2}{\Text{O}}_{3}}\Right]-0.57\Left[{\Text{CaO}}\Right]-0.55\Left[{{\Text{SIO}}_{2}}\Right]+57。1{\Text{Wm}}^{-1}{\Text{K}}^{-1}$$其中[Al2O3]，[CaO]和[SiO]分别为Al_2O_3、CaO和SiO_2的摩尔百分比。建议该方程式涵盖下列组成的区域：8.0亿摩尔百分比；氧化铝；21.0亿摩尔百分比；31.5亿摩尔百分比；41.5亿摩尔百分比和43.0亿摩尔百分比；二氧化硅和lt；58.1摩尔百分比。在CaO/SiO_2摩尔比不变的炉渣中加入Al_2O_3，可提高热导率。相比之下，添加SiO_2和CaO的效果不明显。
The thermal conductivities of some synthetic slags containing Al2O3, CaO, and SiO2have been determined in the temperature range between 1623 K (1350 °C) and 1823 K (1550 °C) by applying a front-heating front-detection laser-flash method. In this method, the temperature response curve is measured in the short initial time period immediately after irradiating a laser pulse. The resultant values obtained by this method are unaffected by the radiative heat transfer. The temperature dependence of the thermal conductivity values were found not to be significant for all slag samples currently investigated. The thermal conductivity (λ) of samples is represented with standard deviation less than 2 pct of its value as a function of compositions as follows:$$ \lambda = - 0.48\left[ {{\text{Al}}_{ 2} {\text{O}}_{ 3} } \right] - 0.57\left[ {\text{CaO}} \right] - 0.55\left[ {{\text{SiO}}_{2} } \right] + 57.1{\text{ W m}}^{ - 1} {\text{ K}}^{ - 1} $$where [Al2O3], [CaO], and [SiO2] are molar percent of Al2O3, CaO and SiO2, respectively. The equation is suggested to cover the region of the following compositions: 8.0 mol pct < Al2O3<21.0 mol pct, 31.5 mol pct < CaO <41.5 mol pct and 43.0 mol pct < SiO2<58.1 mol pct. The addition of Al2O3to slags with a constant CaO/SiO2molar ratio resulted in an increase in thermal conductivity. In contrast, the effects of addition of SiO2and CaO are found to be insignificant.