NiCoCrAlY-ALLOY, POWDER AND LAYER SYSTEM

Abstract

A metallic bond coat Ni16+/−1% Co15+/−1% Cr 8+/−0.5% Al2+/−0.2% Ta0.5+/−0.1% Y: Sicoat 2496 leads to a fusion barrier of titanium into the metallic bond coat so that a substrate is not depleted by titanium.

1 . An alloy, at least comprising (in wt %):
 Cobalt (Co) 16.0%+/−10%,   Chromium (Cr) 15.0%+/−10%,   Aluminum (Al) 8.0%+/−10%,   Tantalum (Ta) 2.0%+/−10%,   Yttrium (Y) 0.5%+/−10%; and   base nickel (Ni).   
     
     
         2 . A powder comprising the alloy according to  claim 1 . 
     
     
         3 . A layer system according to  claim 2  comprising:
 a metallic substrate, including a nickel- or a cobalt-based super alloy, at least one metallic layer made of the alloy or produced by using the powder and an outer most ceramic layer. 
 
     
     
         4 . A ceramic layer system according to  claim 3 , wherein the ceramic layer is a two layered system, which comprises:
 a partially stabilized zirconia layer and an outer most fully stabilized zirconia layer, or zirconia based ceramic layer with an outer most pyrochlore layer.   
     
     
         5 . The layer system according to  claim 3 , wherein the metallic bond coat is a two layered metallic bond coat with an underlying metallic bond coat and an outer metallic bond coat, which especially selected from the compositions (in wt %):
 Ni-(24-26)Co-(11-14)Cr-(10-12)Al-(0.1-0.5)Y,   Ni-(24-26)Co-(23-25)Cr-(10-11)Al-(0.2-0.4)Y,   Ni-(24-26)Co-(14-17)Cr-(10-11)Al-(0.2-0.4)Y,   Ni-(24-26)Co-(14-17)Cr-(10-11)Al-(0.4-0.8)-(0.3-0.7)Ta,   Ni-(24-26)Co-(16-18)Cr-(10-11)Al-(1.0-2.0)Re-(0.1-0.5), and   Co-(29-31)Ni-(27-29)Cr-(7-8)Al-(0.5-0.7)Y(0.3-0.7)Si.   
     
     
         6 . The layer system according to  claim 3 , wherein only a single ceramic layer is present, said ceramic layer is made of zirconia. 
     
     
         7 . An alloy, consisting of (in wt %):
 Cobalt (Co) 16.0%+/−10%,   Chromium (Cr) 15.0%+/−10%,   Aluminum (Al) 8.0%+/−10%,   Tantalum (Ta) 2.0%+/−10%,   Yttrium (Y) 0.5%+/−10%, and   base nickel (Ni).   
     
     
         8 . A powder consisting of the alloy according to  claim 1 .