Abstract
AbstractCylindrical Al2O3/Ce–TZP functionally graded com posites were fabricated by electrophoretic deposition and pressureless sintering in air. Negatively charged Ce–TZP and Al2O3 powders were deposited on a cylindrical electrode from an acetone based suspension. A continuous composition change is realised by chang ing the composition of the suspension. Sintering of the FGM at different temperatures, showed that a temper ature higher than 1550°C was necessary for densification. The resultant FGM cylinder with 5·6 mm dia. had an ideal mechanical structure: a central open channel, a tough Ce–ZrO2 core (KIc > 10 MPa m1/2), a continuous gradient interlayer, and a hard surface layer with HV higher than 15 GPa.
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