Entre las distintas técnicas de medida de la conductividad térmica de materiales, el método comparativo, recogido en la norma ASTM E1225-99, es el más adecuado para muestras porosas o materiales compuestos. Este método permite determinar conductividades térmicas en estado estacionario, en el intervalo de valores de 0,2 a 200 W/mK, y a temperaturas de ensayo en el rango 100-1300 K, dependiendo del diseño del equipo. En este trabajo se expone el diseño, desarrollo y puesta a punto de un equipo de medida de conductividad térmica basado en este método. Paralelamente, se realiza una validación del equipo mediante el estudio comparativo de los resultados obtenidos usando el equipo comparativo y la técnica del pulso láser en materiales porosos de mullita.Palabras clave: conductividad térmica, difusividad térmica, método comparativo, materiales porosos, mullita. Comparative equipment for the measurement of the thermal conductivity.Among the different techniques available for measuring thermal conductivity, the comparative method (ASTM E1225-99) is the most appropriate for porous materials. This method determines the thermal conductivity in steady state conditions in the 100 -1300 K temperature range and for conductivities between 0.2 and 200 W/mK, respectively, depending on the equipment characteristics. In the present paper, the design and development, as well as the start up process, of an apparatus based on this method is described. Thermal conductivity data on a mullite based refractory, measured by both the laser flash and the comparative methods, are presented and comparatively discussed in order to validate the developed equipment.
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