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AssigneeOronzio de Nora Impianti Elettrochimici S.p.A.
InventorsGiuseppe Bianchi, Antonio Nidola, Gian N. Martelli
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A process for preparing an electroconductive metal coating on a substrate wherein precursor compounds capable of decomposing to form an electroconductive coating are subjected to localized high intensive heat, followed by rapid cooling, while maintaining the bulk of the substrate and/or the surrounding atmosphere at a lower temperature. The process is particularly suited for preparing valve metal substrates coated with mixed oxides comprising at least one metal belonging to the platinum group and a valve metal. Such can be utilized as dimensionally stable anodes in electrolytic processes. The process is moreover useful for applying oxides coating on metal and non-metal substrates of different kinds, such as ceramics, glass, plastics and polymeric organic supports.
In a process of preparing an electrode comprising a valve metal substrate and an electroconductive metal coating by applying a compound of said metal capable of decomposing to said substrate and decomposing said coating by heating to form said electroconductive coating, the improvement which comprises subjecting said coating to localized high intensive heat sufficient to decompose said compound while maintaining at least a portion of the substrate at a lower temperature than that of said coating to quench cool the coating and wherein the bulk of the substrate and the atmosphere surrounding the coating are maintained at a lower temperature than that of said coating during the localized high intensive heat.
In a process of preparing an electrode comprising a valve metal substrate and an electroconductive metal coating by applying a compound of said metal capable of decomposing to said substrate and decomposing said coating by heating to form said electroconductive coating, the improvement which comprises subjecting said coating to localized high intensive heat by means of scanning laser beam radiation sufficient to decompose said compound while maintaining at least a portion of the substrate at a lower temperature than that of said coating to quench cool said coating.
In a process of preparing an electrode comprising a valve metal substrate and an electroconductive metal coating by applying a compound of said metal capable of decomposing to said substrate and decomposing said coating by heating to form said electroconductive coating, the improvement which comprises subjecting said coating to localized high intensive heat for a time of 100 seconds or less, sufficient to decompose said compound while maintaining at least a portion of the substrate at a lower temperature than that of said coating to quench cool said coating.
A process for preparing homogeneous phases of oxides of at least two different metals wherein a mixture of thermally reducible salts of said metals is subjected to localized heating in an oxidizing atmosphere to a temperature above the decomposition temperature of the reducible salts by means of a scanning laser beam and the oxides are cooled to below 350.degree. C. within 100 seconds or less from the instant of the application of the heat.
A method of coating a valve metal substrate with an oxide which comprises coating the substrate with a decomposable metal compound capable of forming a metal oxide by thermal decomposition and subjecting the coated substrate to electromagnetic radiation which generates heat internally in the compound or substrate while exposing the coated substrate to an atmosphere which is below said decomposition temperature to quench cool the coating.
Dependencies are inferred from the claim text.