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Thermophysical properties of materials: How metrology can support industry and society for a sustainable development?


J. Filtz1, B. Hay1, J. Hameury1, R. Morice1 and F. Haloua1

1LNE, National Metrology and Testing Laboratory, France

Keywords: thermal barrier coating, thin film, natural gas
property: thermal transport properties, superior calorific value
material: ceramic coating, chalcogenide, methane

This presentation is intended to underline, How metrology can contribute to the development of industry and society?, How traceable and reliable thermophysical properties data of materials are useful and needed? and therefore How it is important to strengthen the basic and applied metrology research in this area. As the application field is extremely wide, this purpose focuses mainly on topics related to energy. Among numerous case studied, the most recent scientific developments relatively to Materials (solid, liquid and gas) which are studied at LNE [1] in cooperation with other National Metrology Institutes or Research Laboratories, are here described. These works allow to contribute to provide guidance on energy stakes issues, the targeted applications, technology developments, and on the progresses expected in scientific knowledge. As examples, the following subjects will be reviewed : Industrial processes and the Thermal Barrier Coatings (TBCs): Mainly used in aerospace, automotive or energy industries, ceramic coatings are often deposited on materials for protecting or improving optical or mechanical properties of a surface. These coatings are applied as shields against thermal wear at high temperature. For these applications, it is necessary to estimate very accurately the thermo-physical properties of the coatings in temperature conditions similar to those encountered in using in order to predict their thermal behaviour. Therefore thermal property measurements must be performed directly on the multilayer composite [2]. Electronics - Thermo-Physical Properties of Thin Films: To better understand the transport phenomena at micro and submicrometer scales, The studies of thermal properties of thin films are needed in micro-electronics (DVD, phase change memory). For instance the implementation of chalcogenides such as Ge2Sb2Te5 is based on the strong variation of their electrical properties, thermal and optical based on their structure (amorphous and crystalline phases). The thermal transport properties of thin films are very different from those of bulk materials of the same chemical composition due to their specific microstructure. It is therefore crucial to perform measurements of the main thermal properties (thermal resistance and thermal conductivity) directly on the material as a thin film [3]. Energy - Natural Gas: In Europe since 2007, Gas transactions being now invoiced in energy (kWh), the calorific value of gas consumed SCV (Superior Calorific Value) should be determined very accurately. It is necessary to know this parameter with very low uncertainties. Partner in a European project [4], LNE has committed to produce and to characterize a new reference calorimeter for determining the calorific value of natural gas components. The goal is to better define the properties of each component . The realization of a national reference standard for measuring SCV by an absolute method has been initiated. The uncertainty's target is fixed at 0.05%.

References
  1. B. Hay, J. Hameury, J.-R. Filtz, F. Haloua, R. Morice. High Temperatures - High Pressures 39 (3), 181-208, (2010)

  2. B. Hay, J.-R. Filtz, J. Hameury, G. Davée, L. Rongione, O. Enouf. Int. J. Thermophys., 30 (4) 1270–1282, (2009)

  3. J.-L. Battaglia, A. Cappella, E.Varesi, V. Schick, A. Kusiak, C. Wiemer, M. Longo, A. Gott, B. Hay. Journal of Physics: Conference Series 214 012102, (2010)

  4. P. Schley ,· M. Beck ,· M. Uhrig, · S. M. Sarge, · J. Rauch ,· F. Haloua ,· J.-R. Filtz, · B. Hay, · M. Yakoubi, · J. Escande, · A. Benito, · P. L. Cremonesi, Int J. Thermophys 31:665–679, (2010)

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