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Dynamic Thermal Diffusivity Measurements - A Tool for Studying Gas-Solid Reactions
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2011 (English)In: DIFFUSION IN SOLIDS AND LIQUIDS VI, PTS 1 AND 2, 2011, 217-222 p.Conference paper (Refereed)
Abstract [en]

In the present work, the thermal diffusivity measurements of uniaxially cold pressed NiWO(4) 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
2011. 217-222 p.
, Defect and Diffusion Forum, ISSN 1012-0386 ; 312-315
Keyword [en]
Thermal diffusivity, gas solid reactions, reduction by hydrogen, NiWO(4) and laser flash
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-53410DOI: 10.4028/ 000297606300038ScopusID: 2-s2.0-79955835015OAI: diva2:470147
6th International Conference on Diffusion in Solids and Liquids JUL 05-07, 2010 Paris, FRANCE
QC 20111228Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2011-12-28Bibliographically approved

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Ahmed, Hesham M.Seetharaman, Seshadri
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