Making a coating of platinum modified nickel aluminide on substrate e.g. blade/external ring of turbine engine made of nickel based alloy, by depositing and diffusing platinum layer in substrate by electrolytic path at high temperature

摘要

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.