METHOD FOR REPAIRING NI BASE ALLOY COMPONENT

• Main Authors: YAMAGUCHI, KENGO, OKADA, IKUO, TAKAHASHI, KOUJI, TORIGOE, TAIJI, AOKI, SUNAO, OHARA, MINORU
• Format: Patent
• Language: English; French; Japanese
• Published: 27.12.2002
• Edition: 7
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; 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; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINE PLANTS IN GENERAL; GAS-TURBINE PLANTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS; INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES ORMATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHERTHAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES; INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; 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; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

A method for repairing a Ni base alloy component having a Ni base alloy parent material (11) and, formed thereon, an undercoat layer (12) and a topcoat layer (13), which has suffered damage in the topcoat layer (13), characterized in that it comprises a step of removing an exfoliated portion (13a) of a damaged topcoat layer (13) and a deteriorated portion (12a) of the undercoat layer (12) corresponding to the exfoliated portion (13a), a step of applying a thermal spraying to an opening of the undercoat layer (12) under a condition of an air atmosphere, a spray particle speed of 300 m/s or more and a parent material temperature of 300 DEG C or lower, or of a reduced pressure, a spray particle speed of less than 300 m/s and a parent material temperature of 600 DEG C or lower, to thereby form a new undercoat layer (17), and a step of forming a new topcoat layer (18) on the exfoliated portion (13a) of the damaged topcoat layer (13). La présente invention concerne un procédé de réparation d'un composant en alliage à base de nickel fait d'une mère (11) en alliage à base de nickel portant une sous-couche (12) et une couche de finition (13), laquelle couche de finition (13) a été abîmée. On commence par éliminer la partie délaminée (13a) de la couche de finition (13) abîmée et la zone touchée (12a) de la sous-couche en regard de la partie délaminée (13a). On applique ensuite une pulvérisation thermique sur la partie dégagée de la sous-couche (12). Cette pulvérisation se fait sous atmosphère d'air, à une vitesse des particules d'au moins 300 m/s, la température de la mère n'excédant pas 300 DEG C, ou bien sous pression réduite, à une vitesse des particules n'excédant pas 300 m/s pour une température de la mère n'excédant pas 600 DEG C, de façon à former une nouvelle sous-couche (17). Une dernière opération consistera en la formation d'une nouvelle couche de finition (18) sur la partie délaminée (13a) de la couche de finition (13) abîmée.