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Activation mechanism and infiltration kinetic for pressureless melt infiltration of Ti activated Al₂O₃ preforms by high melting alloy

Vasi, Srdan ; Grobéty, Bernard ; Kuebler, Jakob ; Graule, Thomas

In: Advanced Engineering Materials, 2009, vol. 11, no. 8, p. 659 - 666

The infiltration mechanism of X3CrNi13-4 in titanium activated porous alumina preforms has been studied. Investigations revealed isolated steel-covered titanium particles beyond the infiltration front. The only transport path possible for the steel to form such wetted islands is through the gas phase. Supersaturation due to the mixing of the steel gas phase with the titanium rich gas phase...