Supported filtration membrane and method of manufacturing same.

摘要

Strong and durable silicon nitride filtration membranes with effective separating layers having effective pore diameters less than about 1 mu m are produced by depositing a source of silicon onto a porous microfilter support, removing any liquid used in the depositing, and subjecting the silicon source to nitridation conditions. Suitable sources of silicon include silicon per se and silica. When silica is used, a suitable reducing agent is deposited therewith to reduce the silica to silicon in situ.