Abstract
Alumina-zirconia laminar ceramics made from layers of different compositions with different stacking sequences were fabricated by tape casting and compared. A phosphate ester dispersant was optimized in MEK/EtOH and an optimum formulation of organic components for tape casting was defined. The fracture resistance, toughness and elastic properties were characterized. A significant improvement of both the fracture resistance and the toughness, from 380 to 560 MPa and from 3.7 to 8 MPa√m respectively, was gained between the pressed alumina monolith and the tape-cast Al 2O 3-ZrO 2 composites. The improvement was tentatively related to the presence of residual stresses at both the microscopic scale (phase transformation toughening) and at the macroscopic scale (interface effects).
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