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Gas-solid reaction route toward the production of intermetallics from their corresponding oxide mixtures
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Department of Minerals Technology, Central Metallurgical Research and Development Institute.ORCID iD: 0000-0002-2358-7719
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo.
Centre of Excellence in Steel Technology (CoEST), Indian Institute of Technology Bombay.
Royal Institute of Technology (KTH), Stockholm.
Number of Authors: 4
2016 (English)In: Metals, ISSN 2075-4701, Vol. 6, no 8, 190Article in journal (Refereed) Published
Abstract [en]

Near-net shape forming of metallic components from metallic powders produced in situ from reduction of corresponding pure metal oxides has not been explored to a large extent. Such a process can be probably termed in short as the “Reduction-Sintering” process. This methodology can be especially effective in producing components containing refractory metals. Additionally, in situ production of metallic powder from complex oxides containing more than one metallic element may result in in situ alloying during reduction, possibly at lower temperatures. With this motivation, in situ reduction of complex oxides mixtures containing more than one metallic element has been investigated intensively over a period of years in the department of materials science, KTH, Sweden. This review highlights the most important features of that investigation. The investigation includes not only synthesis of intermetallics and refractory metals using the gas solid reaction route but also study the reaction kinetics and mechanism. Environmentally friendly gases like H2, CH4 and N2 were used for simultaneous reduction, carburization and nitridation, respectively. Different techniques have been utilized. A thermogravimetric analyzer was used to accurately control the process conditions and obtain reaction kinetics. The fluidized bed technique has been utilized to study the possibility of bulk production of intermetallics compared to milligrams in TGA. Carburization and nitridation of nascent formed intermetallics were successfully carried out. A novel method based on material thermal property was explored to track the reaction progress and estimate the reaction kinetics. This method implies the dynamic measure of thermal diffusivity using laser flash method. These efforts end up with a successful preparation of nanograined intermetallics like Fe-Mo and Ni-W. In addition, it ends up with simultaneous reduction and synthesis of Ni-WN and Ni-WC from their oxide mixtures in single step.

Place, publisher, year, edition, pages
2016. Vol. 6, no 8, 190
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
URN: urn:nbn:se:ltu:diva-15183DOI: 10.3390/met6080190ISI: 000385526800019ScopusID: 2-s2.0-84983273913Local ID: eac66438-6bc2-49d8-8f22-bb6d446eac16OAI: diva2:988156

 Validerad; 2016; Nivå 2; 2016-10-03 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2016-12-12Bibliographically approved

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Ahmed, Hesham
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