Highly porous layer production from paste

摘要

A process for porous layer production on a substrate involves: (a) applying and drying a paste in an atmosphere containing the vapour of the liquid used in the paste, the vapour pressure being controlled such that the drying time is longer than 10 (preferably longer than 30) mins. per 10 microns layer thickness at the prevailing temperature; and (b) sintering the dried paste layer. Preferably, the drying temperature is at least 41 deg C below the boiling temperature of the liquid, preferably water, at atmospheric pressure.