INFILTRATION KINETICS STUDY AND PROCESSING OF LAYERED GRADED Al2O3 -ZrO2 COMPOSITE
Keywords:
Layered graded materials, Al2O3 -ZrO2 composit, infiltration techniqueAbstract
INFILTRATION KINETICS STUDYAND PROCESSING OF LAYERED GRADED Al2O3
-ZrO2
COMPOSITE. Layered graded Al2O3
-ZrO2
composite was successfully synthesised through infiltration of
porous Al2O3
preform with a solution containing ZrOCl2
.8H2O. The infiltration rate of liquid into porous
Al2O3
preform had also been investigated. It was found that the infiltration rate equation proposed by Washburn
is most suitable for describing the effects of preform sintering temperature, viscosity and multiple infiltrations
on the infiltration behaviour, whereas the influence of applied pressure is consistent with the model proposed
by Darcy, where the applied pressure enhances the infiltration rate behaviour. Depth profilling of layered
graded Al2O3
-ZrO2
composite was characterised by x-ray diffraction, the result shows that the concentration
of ZrO2
decreased with depth, while that of Al2O3
increased with depth.
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