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

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Title:	Synthesis of an Al/MgAl2O4 in situ metal matrix composite from silica gel
Authors:	Sreekumar, V M Pillai, R M Pai, B C Chakraborty, M
Keywords:	Dispersoid suspensions Interfacial reactions Magnesium Mgal2O4 Spinel Mgo-Al2o3
Issue Date:	2007
Publisher:	Wiley
Citation:	Journal of the American Ceramic Society 90(9):2905-2911;Sep 2007
Abstract:	An aluminum/MgAl2O4 in situ metal matrix composite has been synthesized using silica gel containing similar to 98% 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 3SiO(2)(s)+2MgO(s)+4Al(l)-> 2MgAl(2)O(4)(s)+3Si(l). The stoichiometry, n, of MgAl2O4 has been found to sustain close to 1 and the crystallite growth of MgAl2O4 has been stopped at D similar to 30 nm in the composites held at 750 degrees C up to 10 h
URI:	http://ir.niist.res.in:8080/jspui/handle/123456789/1907
ISSN:	0002-7820
Appears in Collections:	2007

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