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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >A new numerical method and modified apparatus for the simultaneous evaluation of thermo-physical properties above 1500 K: A case study on isostatically pressed graphite
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A new numerical method and modified apparatus for the simultaneous evaluation of thermo-physical properties above 1500 K: A case study on isostatically pressed graphite

机译：一种新的数值方法和改性装置，用于同时评估1500 k以上的热物理性质：一种静态压下石墨的案例研究

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摘要

This paper presents a new numerical inverse method coupled with an improved apparatus based on the laser flash (LF) technique for the measurement of thermo-physical properties of materials at high temperatures. Using this,thermal conductivity, specific heat capacity, thermal diffusivity and spectral emissivity have been measured at temperatures above 1500 K. The method improves the characterization of input parameters such as laser power profile, which was shown to impact thermal conductivity and specific heat capacity by 15-20%. Convective heat losses are characterized semi-empirically and are not fitted. The apparatus has been enhanced via the adoption of a spectropyrometer for the simultaneous measurement of spectral emissivity within an uncertainty of 5% (equivalent to 0.3-0.7% error in temperature in the range 1500-3000 K)
机译：本文呈现了一种新的数值逆方法，其基于激光闪光（LF）技术的改进装置，用于测量高温下材料的热物理性质。 使用此，在高于1500k的温度下测量导热率，特定的热容量，热扩散率和光谱发射率。该方法改善了输入参数的表征，如激光功率曲线，显示用于冲击导热率和特定热容量 15-20％。 对流热损失是半经验的特征，并且不合适。 通过采用光谱仪来增强该装置，用于在5％的不确定度下同时测量光谱发射率（相当于0.3-0.7％的温度范围内的0.3-0.7％，在1500-3000 k范围内）

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