Alloy, Protective Layer for Protecting a Component Against Corrosion and/or Oxidation at High Temperatures, and Component

Abstract

Known protective layers with a high Cr content and additionally a silicon form brittle phases, which become even more brittle under the influence of carbon during use. The protective layer according to the invention has the composition 27% to 31% nickel, 23% to 29% chromium, 7% to 11% aluminum, 0.5% to 0.7% yttrium and/or at least one equivalent metal from the group comprising scandium and rare earth elements, optionally 0.6% to 0.8% silicon, optionally 0.5% to 0.7% zirconium and the remainder cobalt.

1 .- 18 . (canceled) 
   
   
       19 . An alloy, comprising (in wt %):
 27% to 31% nickel;   23% to 29% chromium;   7% to 11% aluminum;   0.5% to 0.7% yttrium or at least one metal selected from the group consisting of scandium and the rare earth elements;   optionally 0.6% to 0.8% silicon;   optionally 0.5% to 0.7% zirconium; and   remainder cobalt.   
   
   
       20 . The alloy as claimed in  claim 19 , wherein the alloy comprises 28 wt % nickel. 
   
   
       21 . The alloy as claimed in  claim 19 , wherein the alloy comprises 30 wt % nickel. 
   
   
       22 . The alloy as claimed in  claim 21 , wherein the alloy comprises 24 wt % chromium. 
   
   
       23 . The alloy as claimed in  claim 21 , wherein the alloy comprises 28 wt % chromium. 
   
   
       24 . The alloy as claimed in  claim 23 , wherein the alloy comprises 8 wt % aluminum. 
   
   
       25 . The alloy as claimed in  claim 23 , wherein the alloy comprises 10 wt % aluminum. 
   
   
       26 . The alloy as claimed in  claim 25 , wherein the alloy comprises 0.6 wt % yttrium. 
   
   
       27 . The alloy as claimed in  claim 26 , wherein the alloy comprises 0.7% silicon. 
   
   
       28 . The alloy as claimed in  claim 27 , wherein the alloy comprises 0.6% zirconium. 
   
   
       29 . The alloy as claimed in  claim 28 , wherein the alloy comprises silicon and not zirconium. 
   
   
       30 . The alloy as claimed in  claim 28 , wherein the alloy comprises zirconium and not silicon. 
   
   
       31 . A protective layer for protecting a component against corrosion and oxidation at high temperatures, comprising (in wt %):
 27% to 31% nickel;   23% to 29% chromium;   7% to 11% aluminum;   0.5% to 0.7% yttrium or at least one metal selected from the group consisting of scandium and the rare earth elements;   optionally 0.6% to 0.8% silicon;   optionally 0.5% to 0.7% zirconium; and   remainder cobalt.   
   
   
       32 . A component of a gas turbine having a protective layer for protection against corrosion and oxidation at high temperatures, comprising (in wt %):
 27% to 31% nickel;   23% to 29% chromium;   7% to 11% aluminum;   0.5% to 0.7% yttrium or at least one metal selected from the group consisting of scandium and the rare earth elements;   optionally 0.6% to 0.8% silicon;   optionally 0.5% to 0.7% zirconium; and   remainder cobalt.   
   
   
       33 . The component as claimed in  claim 32 , wherein a thermal barrier coating has been applied to the protective layer. 
   
   
       34 . The component as claimed in  claim 33 , wherein a substrate of the component is nickel-based. 
   
   
       35 . The component as claimed in  claim 34 , wherein a substrate of the component is cobalt-based.