Kinetics of metal-ceramic composite formation by reactive penetration of silicates with molten aluminum

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1998.tb02634.x· OSTI ID:655386

Saiz, E; Tomsia, A P ^[1]

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1. Lawrence Berkeley National Lab., CA (United States). Center for Advanced Materials

Wetting and reactions between molten Al and silicate substrates (particularly mullite) are studied to determine both how substrate density and p(O{sub 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 1,000 and 1,200 C independent of p(O{sub 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{sub 2}) must be reached before infiltration starts.

• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 655386
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 81; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
CHEMICAL REACTIONS
COMPOSITE MATERIALS
IMPREGNATION
KINETICS
LIQUID METALS
MICROSTRUCTURE
SILICATES
TEMPERATURE RANGE 1000-4000 K
WETTABILITY