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Synthesis of an Al/MgAl2O4 in situ metal matrix composite from silica gel

Sreekumar, V. M., Pillai, R.M., Pai, B.C. and Chakraborty, M. 2007, Synthesis of an Al/MgAl2O4 in situ metal matrix composite from silica gel, Journal of the American ceramic society, vol. 90, no. 9, pp. 2905-2911, doi: 10.1111/j.1551-2916.2007.01661.x.

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Title Synthesis of an Al/MgAl2O4 in situ metal matrix composite from silica gel
Formatted title Synthesis of an Al/MgAl2O4 in situ metal matrix composite from silica gel
Author(s) Sreekumar, V. M.
Pillai, R.M.
Pai, B.C.
Chakraborty, M.
Journal name Journal of the American ceramic society
Volume number 90
Issue number 9
Start page 2905
End page 2911
Publisher Wiley - Blackwell
Place of publication Malden, Mass.
Publication date 2007-09
ISSN 0002-7820
1551-2916
Summary An aluminum/MgAl2O4 in situ metal matrix composite has been synthesized using silica gel containing B98% SiO2 in an Al–5Mg alloy. The thermodynamics and kinetics of MgAl2O4 formation have been discussed in detail. A transition phase of composition between MgO and MgAl2O4 has been detected in the SEM-EDS analysis of the particles extracted from the composite by a 25% NaOH solution. This confirms the gradual transformation of MgO to MgAl2O4 by the reaction 3SiO2(s)12MgO(s)14Al(l)-2MgAl2O4(s)13Si(l). The stoichiometry, n, of MgAl2O4 has been found to sustain close to 1 and the crystallite growth of MgAl2O4 has been stopped at DB30 nm in the composites held at 7501C up to 10 h.
Language eng
DOI 10.1111/j.1551-2916.2007.01661.x
Field of Research 091201 Ceramics
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, The American Ceramic Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30028217

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