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Combustion synthesis and mechanical properties of MoSi2­-ZrB2­-SiC ceramics
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2018 (English)In: Journal of the Ceramic Society of Japan, ISSN 1882-0743, Vol. 126, no 7, p. 504-509Article in journal (Refereed) Published
Abstract [en]

MoSi2ZrB2SiC ceramics were synthesized using Mo, Zr, Si and B4C powders by self-propagating high-temperature synthesis and densifying by spark plasma sintering. The effects of MoSi2 content on the combustion synthesis process, microstructure, and mechanical properties of the ceramics were investigated. The results showed that combustion synthesis is an unstable mode, spiral combustion. The Gibbs calculations and combustion temperature curves indicate there are two reactions occurring at the same time. The volume fraction of the four different phases and their relative densities were also measured and calculated. Compared to pure MoSi2, the 1.0MoSi20.2ZrB20.1SiC (M10) ceramic exhibits excellent mechanical properties with its maximum Vickers hardness and fracture toughness being 14.0 GPa and of 5.5 MPa m1/2, respectively. The hardness is in agreement with the rule of mixture. The morphology of indentation cracks reveals that the fracture toughness improves as a result of toughening mechanisms such as crack bridge, crack deflection, and microcracks.

Place, publisher, year, edition, pages
Ceramic Society of Japan , 2018. Vol. 126, no 7, p. 504-509
Keywords [en]
Combustion synthesis, In situ, Spark plasma sintering, Mechanical properties, MoSi2
National Category
Ceramics Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-70244DOI: 10.2109/jcersj2.17261ISI: 000437358200002Scopus ID: 2-s2.0-85049330174OAI: oai:DiVA.org:ltu-70244DiVA, id: diva2:1237088
Note

Validerad;2018;Nivå 2;2018-08-09 (andbra)

Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2018-08-09Bibliographically approved

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Zhang, Hanzhu

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