Alloy, protective layer and component

Abstract

A known protective layer has a high Cr content and additionally containing a silicon, forms brittle phases, which become additionally embrittled under the influence of carbon during use. A proposed protective layer has the following composition: 24% to 26% cobalt, 10.5% to 11.5% aluminum, 0.1% to 0.7% yttrium and/or at least one equivalent metal from the group of scandium and the rare earth elements, 12% to 15% chromium, optionally 0.1% to 3% tantalum, optionally 0.05% to 0.5% silicon, with the remainder being nickel.

1 .- 14 . (canceled) 
     
     
         15 . An alloy, comprising:
 24 wt %-26 wt % cobalt;   12 wt %-15 wt % chromium;   5 wt %-11.5 wt % aluminum;   0.1 wt %-0.7 wt % at least one metal comprising scandium and/or a rare earth element;   nickel; and   no rhenium.   
     
     
         16 . The alloy as claimed in  claim 15 , wherein the alloy comprises 25 wt % cobalt, 12 wt % to 14 wt % chromium or 13 wt % chromium, 11 wt % aluminum, yttrium, 0.1 wt % to 3 wt % tantalum, 0.05 wt % to 0.6 wt % silicon, and 43.2 wt % to 53.4 wt % nickel or balance nickel. 
     
     
         17 . The alloy as claimed in  claim 15 , wherein the alloy comprises 0.2 wt %-0.4 wt % yttrium or 0.3 wt % yttrium. 
     
     
         18 . The alloy as claimed in  claim 15 , wherein the alloy comprises at least 0.1 wt % silicon. 
     
     
         19 . The alloy as claimed in  claim 15 , wherein the alloy comprises 0.2 wt % to 0.4 wt % silicon or  0.3 wt % silicon.    
     
     
         20 . The alloy as claimed in  claim 15 , wherein the alloy comprises at least 0.5 wt % tantalum or at least 1.0 wt % tantalum. 
     
     
         21 . The alloy as claimed in  claim 15 , wherein the alloy comprises no zirconium and/or no titanium and/or no gallium and/or no germanium and/or no platinum and/or no hafnium and/or no cerium. 
     
     
         22 . The alloy as claimed in  claim 15 , wherein the alloy consists of cobalt, chromium, aluminum, yttrium, nickel, and optional constituents: silicon and/or tantalum. 
     
     
         23 . The alloy as claimed in  claim 15 , wherein the alloy consists of cobalt, chromium, aluminum, yttrium, nickel, and silicon. 
     
     
         24 . The alloy as claimed in  claim 15 , wherein the alloy consists of cobalt, chromium, aluminum, yttrium, silicon, tantalum, and nickel. 
     
     
         25 . The alloy as claimed in  claim 15 , wherein the alloy consists of cobalt, chromium, aluminum, yttrium, nickel, and tantalum. 
     
     
         26 . The alloy as claimed in  claim 15 , wherein nickel foams a matrix. 
     
     
         27 . A protective layer for protecting a component against corrosion and/or oxidation at a high temperature, comprising:
 an alloy as claimed in  claim 15 .   
     
     
         28 . The protective layer as claimed in  claim 27 , wherein the protective layer is applied by plasma spraying, atmospheric plasma spraying or high velocity spraying 
     
     
         29 . A component of a gas turbine, comprising:
 a protective layer as claimed in  claim 27  to protect the component against corrosion and oxidation at a high temperature; and   a ceramic thermal barrier layer applied onto the protective layer.   
     
     
         30 . The component as claimed in  claim 29 , wherein the component is used in a gas turbine, and wherein a substrate of the component is nickel-based or cobalt-based.