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Łukasiak, Agata
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article
Al2O3-Cu-Mo hybrid composites: fabrication, microstructure, properties
Abstract
The work investigated the influence of the share of metallic components on the microstructure and selected properties ofAl2O3-Cu-Mo composites. Commercial powders were used to produce the composite samples. The composites were obtainedby the slip casting method. Three series of composites with a different volumetric composition of metals in the total content ofthe metallic phase were obtained: Series I - contained 7.5 vol.% Cu - 7.5 vol.% Mo, Series II - contained 10 vol.% Mo -5 vol.% Cu and Series III - contained 12 vol.% Mo - 3 vol.% Cu. All the series contained 15 vol.% metal particles with respectto the total solid phases. Rheological analysis showed that the slurries used to make the composites were shear thinningfluids. The X-ray analysis showed that regardless of the volume content of copper in the suspensions used to form the composite,all the composites after sintering were characterized by the presence of three phases: Al2O3, Cu and Mo. It was found thatthe microstructure in all the series is characterized by homogeneous distribution of the metal particles. All the samples werecharacterized by high porosity, which resulted in their low relative density. The volume fractions of molybdenum and copperin the composite slightly do affect the hardness and fracture toughness of the composite. The obtained hardness results indicatethat increasing the molybdenum content in the composites causes an insignificant increase in the hardness of the samples.