Direct measurement of drainage curves in infiltration of SiC particle preforms: influence of interfacial reactivity
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We present dynamic measurement of drainage curves in two systems having relevance to metal matrix composite processing, namely SiC/Al and SiC/Al-12.2at%Si. Data show that liquid/solid chemical reactions that cause a lowering of the contact angle do indeed drive spontaneous ingress of metal into the preforms at fixed applied pressure; however, these also hinder infiltration under continuous infiltration, lower pressurization rates causing a reduced level of penetration by the metal at given pressure. Metal/reinforcement chemical interactions that can drive wetting by lowering the contact angle are, therefore, not necessarily beneficial in the pressure infiltration processing of particle reinforced metals.
KeywordsSessile Drop Pressurization Rate Triple Line Aluminum Carbide Pressure Infiltration
The authors gratefully acknowledge financial support of this research from NEDO International Joint Research Grant Program, Project 01MB7, CTI project no. 6752-2 and the internal funds from the Laboratory of Mechanical Metallurgy at EPFL.
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