Physicochemical Aspects of the K2ZrF6 Process Allowing the Spontaneous Infiltration of SiC (or C) Preforms by Liquid Aluminium
K2ZrF6 enhances the wetting ability of SiC (or C) fibers by liquid aluminum alloys at low temperatures due to (i) a dissolution of the alumina film by fluoride species, (ii) a local evolution of heat related to exothermic reactions and (iii) the formation of a new liquid phase. The K2ZrF6 process results in a lowering of the UTS reinforcements due to an activation of the kinetics of formation of Al4C3 crystals at the fiber surface. Based on a theoretical modelization, it is established that the impregnation ability of SiC-SiC preforms by aluminum is significantly improved by a K2ZrF6, treatment applied to the preforms prior to casting.
KeywordsAlumina Film Liquid Aluminum Squeeze Casting Filament Surface Fiber Preform
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