Multi-phase ceramics by computer-controlled pressure filtration

A novel apparatus for computer controlled pressure filtration has been constructed. With it, 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, mixed compositions anywhere between 100% composition A to 100% composition B can be realised as a function of the filter cake height. This is suitable for producing e.g. functionally graded materials or layered structures. This has been demonstrated for alumina–zirconia composites. The process is suitable for all materials that can be handled by slip casting.