THERMAL BARRIER DEPOSITED DIRECTLY ON MONOCRYSTALLINE SUPERALLOYS

摘要

The invention relates to the field of superalloys coated in a thermal barrier. On a monocrystalline superalloy having the following composition by weight: 3.5% to 7.5% Cr, 0 to 1.5% Mo, 1.5% to 5.5% Re, 2.5% to 5.5% Ru, 3.5% to 8.5% W, 5% to 6.5% Al, 0 to 2.5% Ti, 4.5% to 9% Ta, 0.08% to 0.12% Hf, 0.08% to 0.12% Si, the balance to 100% being constituted by Ni and any impurities, a stabilized zirconia is deposited directly, the zirconia being stabilized with at least one oxide of an element selected from the group constituted by rare earths, or with a combination of a tantalum oxide and at least one rare earth oxide, or with a combination of a niobium oxide and at least one rare earth oxide.