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Kinetics of Metal‐Ceramic Composite Formation by Reactive Penetration of Silicates with Molten Aluminum
Author(s) -
Saiz Eduardo,
Tomsia Antoni P.
Publication year - 1998
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.1151-2916.1998.tb02634.x
Subject(s) - mullite , wetting , materials science , ceramic , penetration (warfare) , microstructure , aluminium silicate , chemical reaction , kinetics , silicate , infiltration (hvac) , chemical kinetics , reaction rate , chemical engineering , composite material , metal , porosity , aluminium , reactive material , metallurgy , chemistry , catalysis , organic chemistry , physics , operations research , quantum mechanics , engineering
Wetting and reactions between molten Al and silicate substrates (particularly mullite) are studied to determine both how substrate tensity and p (O 2 ) influence wetting behavior, reaction rates, composition, and reaction product microstructure and what key steps control penetration kinetics. Guidelines are provided for using reactive penetration or infiltration when fabricating metal/ceramic composites. For dense substrates, a reactive penetration process occurs. For a certain range, the chemical reaction between Al and the ceramic is a limiting kinetic step resulting in fast reaction rates. Maximum dense mullite substrate reaction rates are between 1000° and 1200°C independent of p (O 2 ), unlike fused silica, which has faster penetration rates at higher temperatures. For mullite, reaction layer microstructure evolution halts reaction at higher temperatures. For porous substrates, reactive infiltration alone occurs. Either a critical temperature or p (O 2 ) must be reached before infiltration starts.