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The alloy protective layer contains the following wt% of the following elements : cobalt 9-11%, chromium 16-26%, aluminum 7-15%, yttrium and/or equivalent from group including scandium and rare earth elements 0.1-0.7%. The rare earth elements should include 4-6 wt.% gallium, preferably 5% gallium and 0% to 0.6% silicon, but should not include rhenium. The rest of the alloy consists of nickel.