| 摘要 |
A method of manufacturing a semi-permeable ceramic membrane and a semi-permeable ceramic membrane made by the method are disclosed. The method includes providing a mixture of at least two mineral components comprising fine particles having an effective particle size of up to 1žm and coarse particles having an effective particle size of 1žm or above, the fine particles having a higher coefficient of thermal expansion than the coarse particles, suspending the mixture of fine and coarse particles in a liquid to form a slurry, applying the slurry to a porous mould to form a green intermediate product, and baking or firing the green intermediate product to form a finished membrane. The finished membrane has a density distribution of the fine particles that increases in one direction (in use) across the finished membrane and a density distribution of the coarse particles that decreases in the same direction across the finished membrane. The composition of the mineral mixture of the slurry is 10-40% fine particles and 90-60% coarse particles. The particles are selected from the group comprising alumina, alumina-magnesian spinels, mullite and zirconium dioxide. The membrane may be used as a filter. |
