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In Situ Formed α-Alumina Platelets in a Mullite–Alumina Composite by M Zhou; J.M.F Ferreira; A.T Fonseca; J.L Baptista is a Materials Science article available to read on EtoBox.

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A diphasic aluminosilicate gel with 10 vol% excess alumina over the stoichiometric mullite composition was prepared by a coprecipitation method and used to prepare a mullite±alumina composite. The microstructure development of this composite, including the precipitation of the excess alumina and its in ̄uence on mullite grain morphology was studied by sintering the green compacts at dierent temperatures and for dierent times. At low sintering temperature (1400 C), mullite formation takes place at local regions of dozens nm and a poorly crystallised mullite phase exists among well crystallised mullite grains. The excess alumina exists in the form of low crystallised and ®ne y-alumina crystallites distributed among the small mullite grains. At higher sintering temperature, the alumina grains develop in preferred orientations forming a-alumina platelets which are [0 0 0 1] oriented. The excess alumina present favours the formation of equiaxed mullite grains.

Who reads In Situ Formed α-Alumina Platelets in a Mullite–Alumina Composite?

Author

M Zhou; J.M.F Ferreira; A.T Fonseca; J.L Baptista

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)