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SISTEMA DE CALENTAMIENTO ESCALONADO PARA LA MEDICIÓN DE LA CONDUCTIVIDAD TÉRMICA
STEP HEATING SYSTEM USED FOR THERMAL CONDUCTIVITY MEASUREMENTS
DOI:
https://doi.org/10.15446/mo.n59.76227Keywords:
Conductancia térmica, Conductividad térmica, Propiedades de transporte. (es)Thermal conductance, Thermal conductivity, Transport properties. (en)
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Se describe un sistema de calentamiento escalonado para la medición de la conductividad térmica, el cual mezcla las ventajas de los métodos dinámicos con las propias de los métodos estacionarios, permitiendo la realización de mediciones rápidas y confiables en el rango de temperatura entre 85K y la temperatura ambiente. Este sistema es especialmente apropiado para la medición de materiales sólidos con una relación longitud-espesor mayor que la unidad.
A fin de ilustrar las capacidades y la fiabilidad del sistema se presentan mediciones de conductividad térmica en muestras de plomo (99.9 %) y material cerámico del tipo La0,92Sr0,08CoO3. Se concluye que este arreglo experimental permite realizar mediciones rápidas y seguras, permitiendo además controlar de manera eficiente las pérdidas por radiación y convección.
We describe a step heating method, which is used for thermal conductivity measurements. This system takes the advantages of both dynamic and steady-state methods. It is especially suitable for solid materials having large length-to-thickness ratio.
In order to illustrate the capabilities and reliability of the system we show some measurements of thermal conductivity on pure lead (99.9 %) and La0,92Sr0,08CoO3 ceramic samples. This technique provides very good precision and fast measurements in the temperature range between 85K and room temperature, along with an effective control of radiative and convective heat losses.
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