Abstract
This study was aimed to improve the wettability of a non-wetting Al 2 O 3 fiber/molten aluminum system, so as to attain full infiltration with a low applied pressure (P a ). The threshold infiltration pressure (P c ) of this composite system with an average fiber volume fraction (V f ) of 0.17 is 139 kPa at a molten aluminum temperature of 1023 K in pressure infiltration. Then non-infiltrated defects appear at locally high V f portions. The θ of 2.24 rad is obtained taking into consideration the effect of non-infiltrated defects. Ultrasonic infiltration, in which ultrasonic vibration was transmitted into molten aluminum through a direct contact of the step-horn and melt, was performed to compare the apparent wettability with that in pressure infiltration
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