PROCEDE POUR REALISER UN REVETEMENT D'ALUMINIURE DE NICKEL MODIFIE PLATINE MONOPHASE

• Main Authors: MALIE ANDRE, CLEACH CATHY
• Format: Patent
• Language: French
• Published: 27.08.2010
• Subjects: APPARATUS THEREFOR; 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; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; 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

The process for making a coating of platinum modified nickel aluminide on a substrate e.g. a blade or an external ring of a turbine engine made of nickel based alloy, comprises depositing and diffusing platinum layer having a thickness of 4-9 mu m in the substrate by electrolytic path at high temperature, and depositing and diffusing aluminum in the substrate enriched of platinum at a high temperature using a donor of chromium and aluminum biphase alloy. The aluminum is transported in a gaseous phase to the substrate in the form of aluminum halide. The process for making a coating of platinum modified nickel aluminide on a substrate e.g. a blade or an external ring of a turbine engine made of nickel based alloy, comprises depositing and diffusing platinum layer having a thickness of 4-9 mu m in the substrate by electrolytic path at high temperature, and depositing and diffusing aluminum in the substrate enriched of platinum at a high temperature using a donor of chromium and aluminum biphase alloy. The aluminum is transported in a gaseous phase to the substrate in the form of aluminum halide. The biphase alloy comprises a first phase of chromium-aluminum (Cr 2Al) having 20-25 mass% of aluminum and a second phase of chromium-aluminum (Cr 5Al 8) having a mass content of 35-45 mass% of aluminum. An independent claim is included for a process for making a thermal barrier on a substrate.