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Combustion synthesis of (Mo1-xCrx)Si-2 (x=0.00-0.30) alloys in SHS mode
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2012 (English)In: Advanced Powder Technology, ISSN 0921-8831, E-ISSN 1568-5527, Vol. 23, no 2, 133-138 p.Article in journal (Refereed) Published
Abstract [en]

Combustion synthesis was adopted to successfully synthesize molybdenum-silicon-chromium (Mo-Si-Cr) alloys by the mode of self-propagating high-temperature synthesis (SHS). The experimental study of combustion synthesis of Mo-Si-Cr alloys was conducted on elemental powder compacts. Powder compacts with nominal compositions including MoSi2, (Mo0.95Cr0.05)Si-2, (Mo0.90Cr0.10)Si-2, (Mo0.85Cr0.15)Si-2, (Mo0.80Cr0.20)Si-2, (Mo0.75Cr0.25)Si-2 and (Mo0.20Cr0.30)Si-2 were employed in combustion synthesis experiments. The combustion mode, combustion temperature, flame-front propagation velocity and product structure were investigated. The results showed that Mo-Si-Cr alloys were synthesized by an unsteady state combustion mode with a spiral-trajectory reaction front. The peak combustion temperature reduced with the addition of Cr to Mo-Si system. The flame-front propagation velocity decreased with an increase in Cr content of the powder compact. The X-ray diffraction (XRD) results showed that the crystal structure of the combustion product changed from CIIb-type structure (Mo0.90Cr0.10)Si-2 to C40-type structure (Mo0.80Cr0.15)Si-2 with increase in Cr content of Mo-Cr-Si alloys. The intensities of diffraction peaks of the C40-type phase gradually increased with increase in Cr content.

Place, publisher, year, edition, pages
2012. Vol. 23, no 2, 133-138 p.
Keyword [en]
Molybdenum disilicide, Chromium alloying, Combustion synthesis, Self-propagating high-temperature synthesis, X-ray diffraction
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-76279DOI: 10.1016/j.apt.2011.01.003ISI: 000301914900001OAI: oai:DiVA.org:su-76279DiVA: diva2:526879
Note
7Available from: 2012-05-15 Created: 2012-05-10 Last updated: 2017-12-07Bibliographically approved

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