Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1907
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
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
ISSN: 0002-7820
Appears in Collections:2007

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