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Synthesis, microstructure and mechanical properties of (Mo,Ti)Si2/Al2O3 composites prepared by thermite-reaction-assisted combustion synthesis
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.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
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Number of Authors: 62016 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 688, p. 870-877Article in journal (Refereed) Published
Abstract [en]

(Mo0.95Ti0.05)Si2/3.3mol%Al2O3 composites were synthesized by self-propagating high-temperature synthesis using Mo, Si, Al and TiO2 powders. The addition of alloying element Ti to MoSi2 and the synthesis of reinforcing particulate Al2O3 phase were achieved through the thermite reaction, Al + TiO2→Ti + Al2O3. The results showed that the combustion synthesis reaction mode in the Mo, Si, Al and TiO2 reaction mixture was spiral and self-propagating, and the reaction product was composed of MoSi2, (Mo,Ti)Si2 and Al2O3. The combustion products were consolidated by vacuum hot-pressing at 1773 K and 27.5 MPa for 90 min to consolidate composites with relative densities above 95% of theoretical. The hot-pressed (Mo0.95Ti0.05)Si2/3.3mol%Al2O3 composite with relative density of 97.5% exhibited finer microstructure and superior mechanical properties compared to MoSi2 monolithic material; Vicker's hardness of 12.9 GPa, bending strength of 320 MPa and fracture toughness of 3.37 MPa m1/2.

Place, publisher, year, edition, pages
2016. Vol. 688, p. 870-877
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-3987DOI: 10.1016/j.jallcom.2016.07.096ISI: 000384430800109Scopus ID: 2-s2.0-84978374773Local ID: 1d70322b-2ffe-49f8-8dcf-1b4f3c30902fOAI: oai:DiVA.org:ltu-3987DiVA, id: diva2:976849
Note

Validerad; 2016; Nivå 2; 20160816 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Akhtar, Farid

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