运用热线法测试了不同碱度（1.1、1.3）,不同TiO2含量（0～8%,质量分数,下同）的连铸保护渣在不同温度下（400～1 300℃）的热传导系数,并结合DSC和XRD分析结果,探讨了碱度和TiO2含量对保护渣导热性能的影响规律及原因。结果表明：本试验条件下液态渣（1 200～1 300℃）的导热系数为0.27～0.5W/（m.K）,固态渣（400～1 000℃）的导热系数远大于液态渣,为1.53～2.09W/（m.K）。在800℃以下的低温区域,试样的导热系数随着碱度的增加而增加,1 100℃以上的高温区域,导热系数随着碱度的增加而减小。TiO2的加入抑制了渣中枪晶石晶体的析出,促进了钙长石、钙钛矿生成,削弱了试样的导热能力;随着TiO2含量的增加,试样的导热系数近似线性减小,TiO2含量每增加2%,试样的导热系数减小约5%。
The heat conductivity of mold fluxes was measured using the hot wire method for different basicity（1.1,1.3） and different TiO2 contents（0-8%） at different temperatures.Combined the analysis results of DSC and XRD,the effects of basicity and TiO2 content on the heat conductivity of mold fluxes were discussed.The results show that thermal coefficient of liquid slag is 0.25-0.77W/（m·K）,the thermal coefficient of the solid slag are 1.53-2.19W/（m·K）.The thermal coefficient increases with increasing the basicity at temperature below 800℃,while it decreases with increasing the basicity at higher temperatures.The added TiO2 can restrain the precipitation of cuspidine,and promote the formation of cristianite and perofskite and weaken the heat conductivity.With increasing of the TiO2 content,the thermal conductivity of samples reduces with approximative linearity,such as 5% of heat conductivity per 2% of TiO2.
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