Turbine part made of superalloy comprising rhenium and/or ruthenium and associated manufacturing method

A process for manufacturing a turbine part, comprising a single-crystal nickel-base superalloy substrate and a sublayer,

• the single-crystal nickel-base superalloy substrate, comprising chromium and at least one element selected from rhenium and ruthenium, having a γ-γ′ phase, an average mass fraction of rhenium and ruthenium greater than or equal to 4% and an average mass fraction of chromium less than or equal to 5%,
• the sublayer covering at least part of a surface of the substrate,
• the sublayer having a γ-γ′ phase and an average atomic fraction:
• of chromium comprised between 5% and 10%,
• of aluminum comprised between 10% and 20%,
• of platinum comprised between 15% and 25%,
• wherein the process comprises at least the steps of:
• a) depositing an enrichment layer on the substrate, the enrichment layer having at least an average atomic fraction of platinum greater 90% and an average atomic fraction of chromium comprised between 3% and 10%,
• b) heat treating the assembly formed by the substrate and the enrichment layer so that the enrichment layer diffuses at least partially into the substrate.