Abstract
The interaction between a fibrous alumina filler and a hydrated zirconia matrix during the fabrication of ceramic composites is studied. The influence of the crystal structure and porosity of the filler on the properties of the ZrO2-Al2O3 composite material is investigated. It is found that, as a result of addition of alumina fibers of cubic and monoclinic structures (γ- and θ-phases), the ZrO2 hydrogel interacts with fibers and solid ZrO2 solutions of tetragonal structure are formed. These solutions exist over the range of 600 to 1200°C and, at annealing above 1200°C, due to crystallographic transitions the of γ- and θ-phases, they break down, namely Al2O3 transforms into α-corundum and ZrO2 into a monoclinic modification. However, the material does not fail and a stable porous ceramic composite is formed. To manufacture a composite with improved mechanical characteristics, fibrous alumina fillers with the structure of -corundum must be used.
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