Tailored microstructures by multi-component pressure filtration
Mattern, A.; Oberacker, R.; Hoffmann, M. J.
EURO CERAMICS VIII, PTS 1-3 264-268 (2004), 169–172
Tailored microstructures by multi-component pressure filtration.
A novel apparatus for computer controlled pressure filtration has been constructed. The precise flow rate of multiple ceramic suspensions of different compositions can be controlled. Suspensions are mixed before entering the filtration chamber. By dynamically adjusting the different flow rates, phase compositions anywhere between 100% phase A to 100% phase B can be realized as a function of the filter cake height with filtration pressures of up to 10 MPa. This is suitable for producing functionally graded materials with smooth changes of composition or layered structures where the changes are steep. Gradients and layers in porous alumina and in alumina-zirconia have been produced and investigated. The process is suitable for all materials that can be handled by slip casting.