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首页> 外文期刊>ISIJ international >Mechanism of Mild Cooling by Crystallisation of Mould Flux for Continuous Casting of Steel - A View from Apparent Thermal Conductivity under Steep Temperature Gradient -
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Mechanism of Mild Cooling by Crystallisation of Mould Flux for Continuous Casting of Steel - A View from Apparent Thermal Conductivity under Steep Temperature Gradient -

机译：钢连铸结晶器结晶器温和冷却的机理-从陡温度梯度下的表观导热系数看-

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Effects of crystallisation on heat transfer across solid mould fluxes have been examined on the basis of apparent thermal conductivities including radiative contribution. The apparent thermal conductivities were measured on glassy and crystallised mould flux samples under steep temperature gradients using a parallel plate method improved in the present work. Both surfaces of the samples were coated with silver paste to reduce contact thermal resistance. Thermal resistance except the sample itself was experimentally determined to be 2.27 × 10~(?4) m~(2)KW~(?1) based upon measurements on Inconel 600. To confirm the reasonableness of this value, the method was applied to fused silica. Apparent thermal conductivities were in good agreement with reported values. Apparent thermal conductivities of mould fluxes were measured up to 900°C at the high temperature side of the sample. The thermal conductivity of the glassy sample was 1.25 Wm~(?1)K~(?1) below 300°C in the central temperature (T _(c)) of the sample, and was lower than those of the crystallised samples. With increasing degree of crystallinity, the thermal conductivities increased around room temperature. Samples with higher degrees of crystallinity showed negative temperature dependence more remarkably and resultantly were close to that of the glassy sample where T _(c) ~ 350–500°C. Where T _(c) > 500°C, the thermal conductivity of the glassy sample was 1.54 Wm~(?1)K~(?1) and was greater than that of a crystallised sample, 1.32 Wm~(?1)K~(?1), which would be due to the radiation. Apparent thermal conductivity at a practical temperature has also been estimated, which suggests that crystallisation enables radiative thermal conductivity to be reduced.
机译：已根据表观热导率（包括辐射贡献）检查了结晶对跨固模助熔剂传热的影响。使用在本工作中改进的平行平板方法，在陡峭的温度梯度下，对玻璃状和结晶的结晶助焊剂样品进行表观热导率测量。样品的两个表面均涂有银浆，以降低接触热阻。根据Inconel 600的测量，通过实验确定样品本身以外的热阻为2.27×10〜（？4）m〜（2）KW〜（？1）。为证实该值的合理性，将该方法应用于熔融石英。表观热导率与报告值高度吻合。在高达900°C的样品高温侧测量了熔剂的表观导热系数。在样品的中心温度（iT_（c））下，玻璃状样品的热导率在300℃以下为1.25Wm·（？1）K〜（？1），并且低于样品的中心温度。结晶样品。随着结晶度的增加，室温附近的热导率增加。结晶度较高的样品更显着地显示出负温度依赖性，因此与T_（c）〜350–500°C的玻璃状样品接近。当T _（c）＞ 500℃时，玻璃状样品的热导率为1.54Wm·（·1）K·（Δ1），大于结晶样品的热导率为1.32W·m·（·1）。 1）K〜（？1），这可能是由于辐射引起的。还估计了在实际温度下的表观热导率，这表明结晶可降低辐射热导率。

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