Alloy, protective layer for protecting a component from corrosion and oxidisation in high temperatu

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The alloy composition is : cobalt 12 wt%, chromium 21wt%, aluminum 11wt%, yttrium and/or one or more equivalent metals selected from scandium and the rare earth metals 4wt%, rhenium 2wt%. Optional traces of carbon, oxygen, nitrogen and hydrogen are present at up to 5 wt%. Their maximum permissible individual levels are : carbon 250 ppm, oxygen 400 ppm, nitrogen 100 ppm and hydrogen 100 ppm. The remainder is nickel. The alloy comprises nickel, cobalt, chromium, aluminum, yttrium and rhenium. It forms a layer protecting a component against corrosion and/or oxidation at high temperatures. The maximum content of chromium-rhenium precipitates is 6 vol%. The component is part of a gas turbine. A ceramic thermal insulation layer is deposited on the protective layer. A substrate of the component is nickel-based and/or cobalt-based.