Abstract
Out first results concerning the elaboration of Functionally Graded Cermets (FGC) are presented. The studied material is an alumina matrix with a SnPb alloy graded fraction. In a first step, an unidirectional gradient of graphite volume fraction in alumina is obtained by sedimentation of a mixing of the alumina and graphite powders. Then, during the sintering stage, the graphite burns and acts as porosity inducing element. Finally, the FGC is obtained by pressure infiltration of a molten SnPb alloy into the graded porosity of the alumina preform. The distribution of the SnPb alloy through the composite is characterised by SEM observations and microhardness tests. From a qualitative point of view, the shape of the gradients in the sample, deduced from the hardness measurements, agree with a simple simulation of the graphite gradient in the alumina deposit, based on Stockes law.
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