| 摘要 |
<p>A filtration structure, suitable particularly for ultrafiltration, is essentially constituted by a porous support of a relatively coarse grain sintered material bearing a thinner filtering layer of a relatively fine grain sintered material, formed on top of the support and not penetrating substantially between the grains of the latter. It can be produced by simultaneous baking of the support and of the filtering layer, from, for example, a tube formed by extrusion of a first sinterable composition to constitute the support, on which has been deposited, after drying, a second composition suspended in water, to form a thin coating constituting the filtering layer in the finished structure. The first composition contains an organic binder which decomposes on baking.</p> |
