The measurements by the back surface laser flash method and the construction of the database on thermal conductivity of silicate melts.

在金属细化过程中，对环境负荷降低的要求越来越高，对系统传热现象的把握是设计中不可缺少的。高温过程中硅酸盐熔体热性能的测量是按照这些要求进行的。但导热系数作为精炼过程传热中最重要的物理性质之一，硅酸盐熔体高温区的导热系数通过测量方法测得的值相差很大，目前还没有得到可靠性较高的值。在本研究中，从两个方向来探讨这个问题。一种是对常规研究中得到的数值进行评估并存入数据库。二是基于新原理建立高可靠性的测量方法。在本研究中，在薄铂坩埚中填充硅酸盐熔体样品，并对坩埚底表面进行脉冲加热。通过铂坩埚辐照后的温度响应，测定了氧化铝/二氧化硅/钙系炉渣的导热系数。根据实测结果和数据库，对两种模型进行了检验。一种是热量通过硅酸盐的Si-O-Si网络传播的模型。另一种是传热取决于熔体结构的规律性的模型。热通过Si-O-Si网络传播的模型不能很好地解释实验结果。而热导率取决于结构的规律性的模型是相当有效的，因为在液态时较高的热导率在固态晶体相的相应组成附近。

In the metal refinement process, the request of environmental loading reduction has become intensified, and a grasp of the heat transfer phenomenon of the system is indispensable for the design. The measurement of the thermal property of silicate melt of the high temperature in the process is carried out in proportion to these requests. However, thermal conductivity thermal conductivity of the high-temperature region of the silicate melt which is one of the most important physical property in heat transfer of the refining process the measured value is greatly different by measuring method, and the value with the high reliability has not been obtained yet.In this study, this problem is approached from two directions. One is to evaluate the values derived in the conventional study and stores them into database. The other is to establish the measuring method with the high reliability based on the new principle.In this study, the thin platinum crucible is filled with the silicate melt sample, and the pulse heating is irradiated on the bottom surface of the crucible. The thermal conductivity of the alumina/silica/calcia system slag was measured by this technique from the temperature response of platinum crucible after irradiation. With the measured results and database, two models were examined. One is the model in which a heat propagates through the network of Si-O-Si of the silicate. The other is the model in which the heat transfer depends on the regularity of the structure in the melt.The model in which a heat propagates through the network of Si-O-Si does not explain the experimental result well. While the model that thermal conductivity depends on the regularity of the structure is rather effective considering that higher thermal conductivity at liquid state is observed in the vicinity of the corresponding composition of the crystal phases in solid state.