This article presents a simple thermal characterization method, noted CFM, for the measurement of the apparent thermal conductivity of insulating materials at high temperature (i.e., up to 600 °C). The CFM method is a steady-state relative measurement method which requires a calibration. The calibration of the experimental apparatus was done with a calcium silicate board of known thermal conductivity. Thermal conductivity measurements were carried out on a low-density compressible fibrous felt and a high-density calcium silicate board between 100 and 600 °C. A good agreement was observed with the values obtained with the guarded hot-plate (GHP) method for the low-density fibrous felt and the parallel hot-wire (PHW) method for the high-density calcium silicate board. The measurement of the apparent thermal conductivities of low-density fibrous felts of different apparent densities, combined with a simple conducto-radiative model, allowed to estimate a mean specific extinction coefficient in good agreement with a value derived from transmittance/reflectance measurements.

中文翻译：

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高温下绝缘材料表观热导率测量的比较通量 (CFM) 方法

本文介绍了一种简单的热表征方法，称为 CFM，用于测量绝缘材料在高温（即高达 600 °C）下的表观热导率。CFM 方法是一种需要校准的稳态相对测量方法。实验装置的校准是用已知导热率的硅酸钙板完成的。热导率测量是在 100 到 600 °C 之间的低密度可压缩纤维毡和高密度硅酸钙板上进行的。观察到低密度纤维毡采用防护热板 (GHP) 方法和高密度硅酸钙板采用平行热线 (PHW) 方法获得的值具有良好的一致性。