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A wealth of experimental data indicate that while capillarity controlledinfiltration gives an infiltration length that varies with the square root oftime, reactive infiltration is characterised by a linear relationship betweenthe two magnitudes. In addition the infiltration rate in the latter is at leasttwo orders of magnitude greater than in the former.  This work is addressed to investigate imbibition of a non-wetting, albeitreactive, liquid into a capillary, within the framework of a simple model thatincludes capillarity effects, viscosity and gravity. The capillary radius isallowed to vary, due to reaction, with both position and time, according toeither an interface or a diffusion law. The model allows for capillary closurewhen reaction kinetics dominates imbibition. At short times, and depending onwhether infiltration is capillarity or gravity controlled, the infiltratedlength varies either as the square root or linearly with time. This suggest thefollowing track for reactive infiltration: i) In most cases, the contact angleis initially larger than $90^\circ$, ii) after some time, reaction graduallyreplaces the interface liquid/preform by the liquid/reaction product interfaceand, concomitantly, the contact angle gets closer to $90^\circ$, iii) beyondthat time, gravity triggers infiltration (actually the contact angle does notneed to be smaller than $90^\circ$ for the initiation of infiltration due tothe metallostatic pressure exerted by the liquid metal on top of the porouspreform), iv) thereafter infiltration is controlled by viscosity and gravity,provided that, due to reaction, the contact angle remains close to that atwhich infiltration was initiated.

Reactive infiltration: identifying the role of chemical reactions, capillarity, viscosity and gravity