Abstract

A number of thermophysical properties of pure magnesium are measured with high accuracy over a wide range of temperatures in the solid and liquid states. The enthalpy and isobaric heat capacity of magnesium are investigated over a temperature range of 431–1176 K with application of a massive high-temperature isothermal drop calorimeter. The estimated error in the data on enthalpy and heat capacity is 0.2% and 0.5%, respectively. The enthalpy of fusion of magnesium is 8455 ± 22 J/mol. The thermal conductivity and thermal diffusivity of solid and liquid magnesium are measured in the range of 291 K to 1221 K by the laser flash method. The errors in the thermal conductivity measurements are 2–5% for the solid state and 4–6% for the liquid one. It is shown that the thermal conductivity and thermal diffusivity of magnesium decrease about 1.5 times during melting. Our results are compared with data in the literature and with calculations based on the Wiedemann–Franz law. Approximation equations are constructed and tables of recommended values of the investigated properties of magnesium are presented for a temperature range of 291–1221 K for the condensed state.

中文翻译：

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固态和液态镁的热物理性质

摘要

在固态和液态的广泛温度范围内，以高精度测量纯镁的许多热物理性质。应用大型高温等温滴量热仪在 431–1176 K 的温度范围内研究了镁的焓和等压热容。焓和热容量数据的估计误差分别为 0.2% 和 0.5%。镁的熔化焓为 8455 ± 22 J/mol。采用激光闪光法在 291 K 至 1221 K 范围内测量固态和液态镁的热导率和热扩散率。固态热导率测量误差为 2-5%，液态热导率测量误差为 4-6%。结果表明，镁的热导率和热扩散率降低了约 1。熔化期间5次。我们的结果与文献中的数据以及基于 Wiedemann-Franz 定律的计算进行了比较。构建了近似方程，并针对凝聚态 291–1221 K 的温度范围提出了镁的研究性质推荐值表。