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Low‐Temperature Synthesis of BaAl 2 O 4 /Aluminum‐Bearing Composites by the Oxidation of Solid Metal‐Bearing Precursors
Author(s) -
Citak Ramazan,
Rogers Kirk A.,
Sandhage Ken H.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01752.x
Subject(s) - materials science , aluminium , barium , metal , oxygen , yield (engineering) , peroxide , composite material , bearing (navigation) , metallurgy , chemistry , organic chemistry , cartography , geography
BaAl 2 O 4 /aluminum‐bearing composites have been synthesized via the low‐temperature oxidation of Ba‐Al precursors. Ba‐Al powder mixtures that were prepared via high‐energy vibratory milling were uniaxially pressed into bar‐shaped specimens that were then exposed to a series of heat treatments in pure, flowing oxygen at temperatures up to 640°C. Oxidation at a temperature of 300°C resulted in the formation of barium peroxide (BaO 2 ). Additional heat treatment at a temperature of 550°C resulted in the consumption of BaO 2 and some aluminum to yield BaAl 2 O 4 and Al 4 Ba. The oxidation of Al 4 Ba at a temperature of 640°C yielded additional BaAl 2 O 4 . Microstructural analyses revealed that a well‐dispersed, co‐continuous mixture of Al 2 O 3 ‐excess BaAl 2 O 4 and 99.5% pure aluminum was produced.