Metrological facilities for thermophysical properties measurements at very high temperature
Industries such as glass, nuclear, space and aeronautics continuously need to design new products and improve the existing ones in order to remain competitive in their market. This often involves the use and the development of new materials, mechanically stronger, thermally more resistant, easier to manufacture, etc. A common specificity of these industries is to work with high temperature materials up to 3000 °C. Although some facilities for measuring thermophysical properties at such high temperatures are already available, they need to be traceable to SI units in order to assess the reliability of measurements for these demanding industries.
In order to fill this gap , EMPIR Hi-TRACE project aims at developing reference facilities and new methodologies for measuring thermophysical properties of solid materials at these high temperatures as well as adhesion and thermal contact resistances above 1000 °C of layered systems. The project is split into four technical work packages. In WP1 a reference apparatus based on the laser flash method will be developed with a targeted expanded uncertainty of few percent on thermal diffusivity values up to 3000 °C. A comparison between this reference setup and devices used by industrial partners will be organized for different materials in order to validate the uncertainty budgets of these last ones. Drop calorimeters will be designed in WP2 with a targeted expanded relative uncertainty on specific heat values of 0.5% below 1000 °C and 1.5% above. Other facilities based on ohmic or laser pulse-heating techniques will be adapted for high temperature measurements and compared with the drop calorimeters. In WP3 Emissivity (normal spectral or total hemispherical) will be measured by a reference facility under development. Induction-heating, Ohmic-pulse-heating and laser-based facilities will be developed for measuring emissivity and temperature of fusion. A 3D model based on measurements of bi-layers and tri-layers artefacts will be developed in WP4 for calculating the thermal contact resistance between layers, which is a key parameter for understanding the debonding phenomena of e.g. thermal barrier coating on gas turbine blades. The paper gives an overview of the project and its unique network of facilities necessary for addressing today and future market needs.
Acknowledgement: This work is supported by the European Union (FKZ 17IND11 – Hi-TRACE) within Horizon 2020
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