Dynamic thermal diffusivity measurements: A tool for studying gas-solid reactions
2011 (English)In: Diffusion in Solids and Liquids VI: selected, peer reviewed papers from the 6th International Conference on Diffusion in Solids and Liquids : mass transfer, heat transfer, microstructure & properties, nanodiffusion and nanostructured materials : DSL-2010, 5-7 July 2010, Paris, France / [ed] Andreas Öchsner; Graeme E. Murch ; João M.P.Q. Delgado, Durnten-Zurich: Trans Tech Publications Inc., 2011, Vol. 312-315, 217-222 p.Conference paper (Refereed)
In the present work, the thermal diffusivity measurements of uniaxially cold pressed NiWO4 has been carried out. The measurements were performed isothermally at temperatures between 973 and 1273 K under H 2 gas using the laser flash technique. The experimental thermal diffusivity values were found to increase with the reduction progress as well as with increasing temperature. The calculated activation energy was found to be higher than that for chemically controlled reaction. The difference has been attributed to factors like agglomeration of the product as well as sintering of the precursor along with the chemical reaction. In order to sort out the sintering effect on the thermal diffusivity values, complementary experiments have been done on pressed NiWO 4 and Ni-W, produced by the reduction of NiWO 4 at 1123K, under Argon gas. The porosity change and its effect on thermal diffusivity values have been studied.
Place, publisher, year, edition, pages
Durnten-Zurich: Trans Tech Publications Inc., 2011. Vol. 312-315, 217-222 p.
, Defect and Diffusion Forum, ISSN 1012-0386 ; 312-315
Research subject Process Metallurgy
IdentifiersURN: urn:nbn:se:ltu:diva-36965DOI: 10.4028/www.scientific.net/DDF.312-315.217Local ID: ad0eb6fe-65a5-473c-847e-650c9dd94ff2OAI: oai:DiVA.org:ltu-36965DiVA: diva2:1010464
International Conference on Diffusion in Solids and Liquids, Mass Transfer - Heat Transfer - Microstructure & Properties - Nanodiffusion and Nanostructured Materials : 05/07/2010 - 07/07/2010
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