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Gas-solid reactions towards new frontiers
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2006 (English)In: 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium, 2006, 97-114 p.Conference paper (Refereed)
Abstract [en]

Reactions between solids and a gas phase have many interesting theoretical aspects as well as technological applications. The present group had carried out experimental investigations as well as theoretical studies of a number of gas-solid reactions over the past decade and was able to derive interesting results. Studies of the decomposition of alkaline earth carbonates were carried out by thermogravimetric analyses. The experiments were carried out using thin powder beds as well as iso-statically pressed compacts with thermocouples embedded in the same. The investigations revealed the complexity of the reactions and the impact of the heat- and mass transfer aspects on the reaction kinetics. In the case of BaCO3, the kinetics of decomposition was complicated by the formation of a liquid phase. In the case of SrCO3, the reaction kinetics could be simulated by theoretical modeling. Gas-solid reactions were also employed as a versatile process tool towards the production of alloys and intermetallics involving transition elements by hydrogen reduction of complex oxides involving transition metals. Thin powder beds were employed to examine the micro-kinetics, while fluidized bed technique was utilized to produce bulk alloys. Preliminary correlations could be drawn between the thermodynamic stabilities of the oxides and the activation energies of chemical reduction steps. Adjusting the process parameters, products at nano-scale could be produced. The structural, mechanical and thermal properties were investigated in the case of these products. The potentialities of this method as a green route to produce industrially important alloys and intermetallics with unique properties are demonstrated.

Place, publisher, year, edition, pages
2006. 97-114 p.
, 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium, 1
Keyword [en]
Carbonate decomposition, Hydrogen reduction, Nanocrystals, Alkaline earth metal compounds, Carbonates, Decomposition, Mass transfer, Powder metals, Reaction kinetics, Thermogravimetric analysis, Alkaline earth carbonates, Materials science
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-155852ISI: 000241785700008ScopusID: 2-s2.0-33846044068ISBN: 0873396332ISBN: 9780873396332OAI: diva2:764483
2006 TMS Fall Extraction and Processing Division: Sohn International Symposium, 27 August 2006 through 31 August 2006, San Diego, CA

QC 20141119

Available from: 2014-11-19 Created: 2014-11-13 Last updated: 2014-11-19Bibliographically approved

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Seetharaman, Seshadri
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