METHOD FOR LOCALLY REMOVING OXIDIZED CORROSION PRODUCT FROM SURFACE OF PARTS OF TURBINE ENGINE

PROBLEM TO BE SOLVED: To provide a method for selectively removing combustion product from surface of parts of a gas turbine after the long term exposure in the high temperature oxidizing and corrosive environment of exhaust gas of the gas turbine without affecting metal or film of adjacent substrat...

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Bibliographische Detailangaben
Hauptverfasser:	FARR HOWARD JOHN, CONNER JEFFREY ALLEN
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for selectively removing combustion product from surface of parts of a gas turbine after the long term exposure in the high temperature oxidizing and corrosive environment of exhaust gas of the gas turbine without affecting metal or film of adjacent substrates which are not altered, and a material composition therefor. SOLUTION: Loose contamination is removed from the surface of parts of the gas turbine engine, a moldable reactive metallic composition including more than one kinds of metals having affinity with oxygen selected from the group consisting of Al, Si, Ti and Zr is applied to the corrosion part which is heated to about 1800-2000 deg. F in a non-reactive environment to generate the reaction between the combustion product and the reactive metal. Thereby, the combustion product of the corrosion part on the surface if decomposed to occur a by-product, which is cooled thereafter. The by-product can be removed optionally from the surface of parts.