Thermal Conductivities of Fe-Ni Melts Measured by Non-contact Laser Modulation Calorimetry
Thermal Conductivities of Fe-Ni Melts Measured by Non-contact Laser Modulation Calorimetry
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DOI：
10.1007/s11661-019-05250-9
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Manabu Watanabe;M. Adachi;M. Uchikoshi;H. Fukuyama
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文献类型：
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作者：
Manabu Watanabe;M. Adachi;M. Uchikoshi;H. Fukuyama
采用电磁悬浮技术结合静磁场和激光调制量热法测量了Fe-Ni合金熔体在1673 ~ 1904 K（包括过冷温度区）的热导率。静磁场抑制对流，平移运动，和悬浮液滴的表面振荡，以减少测量中的实验不确定性。高纯度Fe（99.9985质量%）和Ni（99.9960质量%）用于测量的样品。对于所有的熔体组合物，热导率有一个积极的温度依赖性，除了与0.4摩尔分数的Fe的样品。Fe-Ni的热导率测量值大于从电导率评估的那些，假设所有组成范围的Wiedemann-Franz定律。这意味着原子的热振动对热导率有贡献。
A combination of an electromagnetic levitation technique with a static magnetic field and laser modulation calorimetry was used to measure the thermal conductivity of Fe-Ni melts between 1673 K and 1904 K, including the supercooled temperature region. The static magnetic field suppressed convection, translational motion, and surface oscillation of the levitated droplet to reduce the experimental uncertainty in the measurements. High-purity Fe (99.9985 mass pct) and Ni (99.9960 mass pct) were used for the sample of the measurements. For all melt compositions, the thermal conductivity had a positive temperature dependence, except for a sample with a 0.4 mole fraction of Fe. The measured thermal conductivity values of Fe-Ni were larger than those evaluated from the electric conductivity assuming the Wiedemann–Franz law for all composition ranges. It implies that atomic thermal vibration contributes to the thermal conductivity.