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Processing and characterization of Zr3Si2 for nuclear applications

Author:
Marion Le Flem   Jér?me Canel   Stéphane Urvoy  


Journal:
Journal of Alloys and Compounds


Issue Date:
2008


Abstract(summary):

Zr 3Si 2 compound, which is not commercially available, was synthesized for use as neutron reflector in the core of the future nuclear power plants: the aim was to get data on basic properties such as thermal properties to be used in reactor design codes. The material was processed in three steps: (i) arc melting of Si granules and Zr sheets, (ii) crushing of the obtained ingot and (iii) hot isostatic pressing. The obtained dense Zr 3Si 2 bulk sample contained small amount of metastable Zr 5Si 3 compound. The microstructure exhibited a large grain size distribution (<2-50 mum) but the sample was homogeneous in composition. Thermal expansion measurements showed good dimension stability of the material up to 1273 K, and a thermal expansion coefficient of 8.11times10 -6 K -1. Heat capacity and thermal diffusivity measurements allowed to calculate thermal conductivity up to 1273 K: it was quite high and slightly increases from 19 W/mmiddotK to 20.5 W/mmiddotK, confirming the metallic feature of Zr 3Si 2. [All rights reserved Elsevier].


Page:
0-273


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