Aluminium carbide formation in interpenetrating graphite/aluminium composites

We have produced interpenetrating graphite/aluminium composites by gas pressure infiltration of aluminium alloys with varying silicon content into porous graphite preforms. Infiltration experiments at 750 °C have shown that a silicon content of up to 18 wt.% can reduce the formation of aluminium car...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-03, Vol.448 (1), p.1-6
Main Authors: Etter, T., Schulz, P., Weber, M., Metz, J., Wimmler, M., Löffler, J.F., Uggowitzer, P.J.
Format: Article
Language:English
Subjects:
Aluminium carbide
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Gas pressure infiltration
Graphite
Interpenetrating phase composites
Liquid metal infiltration
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Powder metallurgy. Composite materials
Production techniques
X-ray diffraction
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description We have produced interpenetrating graphite/aluminium composites by gas pressure infiltration of aluminium alloys with varying silicon content into porous graphite preforms. Infiltration experiments at 750 °C have shown that a silicon content of up to 18 wt.% can reduce the formation of aluminium carbide but cannot completely deter it. Optical and scanning electron microscopy revealed numerous lath-like interfacial aluminium carbide crystals in the μm regime which, however, did not affect the flexural strength of our composites. Severe aluminium carbide degradation was observed within a few days on composites exposed to ambient conditions. Carbide-free composites were produced by reducing the infiltration temperature to 670 °C for the eutectic alloy.
doi_str_mv 10.1016/j.msea.2006.11.088
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source ScienceDirect Journals
subjects Aluminium carbide
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Gas pressure infiltration
Graphite
Interpenetrating phase composites
Liquid metal infiltration
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Powder metallurgy. Composite materials
Production techniques
X-ray diffraction
title Aluminium carbide formation in interpenetrating graphite/aluminium composites
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