Thermophysical Properties of Containerless Liquid Iron up to 2500 K
Thermophysical Properties of Containerless Liquid Iron up to 2500 K
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DOI：
10.1023/a:1019888119614
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发表时间：
2002-09
影响因子：
2.2
通讯作者：
G. Wille;F. Millot;J. Rifflet
中科院分区：
文献类型：
--
作者：
G. Wille;F. Millot;J. Rifflet
在装有高速摄像机和三波长高温计的空气动力悬浮装置上，用CO2激光加热高温铁液，测定了铁液的热物理性质。液滴的自由冷却和加热的特征曲线可用于确定固体和液体铁的相同表观发射率，并基于铁的熔点的已知值校准高温计，即，1808 K.通过对过冷铁液的放热和进一步凝固过程的研究，得到了铁液熔化焓与热容的比值。表面张力σ由液滴振动的分析确定。在1750 K（过冷液体）和2500 K之间，结果精确地描述为σ（mJ <$m−2）=（1888±31）−（0.285±0.015）（T-Tm）。根据图像的大小和铁液滴的质量推导出铁液的密度。
Thermophysical properties of high temperature liquid iron heated with a CO2laser have been determined in an aerodynamic levitation device equipped with a high-speed camera and a three-wavelength pyrometer. Characteristic curves of the free cooling and heating of the drop can be used to determine the same apparent emissivity of solid and liquid iron and to calibrate pyrometers based on the known value of the melting point of iron, i.e., 1808 K. Examination of the recalescence of undercooled liquid iron and further solidification are used to obtain the ratio of the melting enthalpy versus the heat capacity of liquid iron as. The surface tensionσwas determined from an analysis of the vibrations of liquid drops. Results are accurately described byσ(mJ⋅m−2)=(1888±31)−(0.285±0.015) (T−Tm) between 1750 K (undercooled liquid) and 2500 K. The density of liquid iron has been deduced from the image size and the mass of the liquid iron drops.