Process to deposit metal and metal oxide coatings

摘要

The process permits producing metal and metal oxide coatings from precursor solutions, as occurs in the technique called sol-gel, but with the advantage that the precursor solutions do not include metal alkoxides to be hydrolyzed, for which reason the long term stability is excellent. The precursor solutions of the coatings are prepared by dissolving a metal salt in ethanol with a complexing agent to favour its stability and/or an additive to provide the solution with the necessary properties to deposit it homogeneously on a substrate. The precursor solutions are deposited by extracting the substrate at a constant rate, centrifuging or spraying, they are dried at temperatures between 50 and 150oC and are densified by means of a thermal treatment at temperatures between 300 and 600oC, for a time ranging from 10 to 60 minutes.