Superalloy component and slurry composition

Abstract

A slurry composition for aluminising a superalloy component is provided, wherein the slurry includes an organic binder and a solid content including aluminium. The slurry further includes hafnium and yttrium. In addition, a superalloy component is provided which includes an aluminide coating. The coating material has at least one layer which includes hafnium and yttrium in addition to aluminium.

1 .- 13 . (canceled) 
     
     
         14 . A slurry composition for aluminising a superalloy component, comprising:
 an organic binder, and   a solid content including aluminium,   wherein the composition further comprises hafnium and yttrium.   
     
     
         15 . The composition as claimed in  claim 14 , wherein the composition comprises a hafnium content which is less than or equal to 2.5% by weight of the composition. 
     
     
         16 . The composition as claimed in  claim 15 , wherein the composition comprises a hafnium content which is less than or equal to 1% by weight of the composition. 
     
     
         17 . The composition as claimed in  claim 14 , wherein the composition comprises a yttrium content which is less than or equal to 0.1% by weight of the composition. 
     
     
         18 . The composition as claimed in  claim 17 , wherein the composition comprises a yttrium content which is less than or equal to 0.05% by weight of the composition. 
     
     
         19 . The composition as claimed in  claim 14 , wherein the solid content includes silicon between 1% and 40% by weight of the total solid content. 
     
     
         20 . The composition as claimed in  claim 14 , further comprising a sulphur content which is not more than 5 ppm by weight of the composition. 
     
     
         21 . The composition as claimed in  claim 14 , wherein the organic binder comprises chromate and/or phosphate organic binders. 
     
     
         22 . A superalloy component, comprising:
 an aluminide coating, wherein the aluminide coating comprises at least a first layer, and wherein the coating material of the first layer comprises hafnium and yttrium in addition to aluminium   
     
     
         23 . The superalloy component as claimed in  claim 22 , wherein the aluminide coating comprises at least two layers, the at least two layers comprising the first layer and a second layer, wherein coating material of the second layer comprises aluminium without hafnium and without yttrium. 
     
     
         24 . The superalloy component as claimed in  claim 23 , wherein the aluminide coating comprises at least three layers, the at least three layers comprising the first layer, the second layer and a third layer, wherein coating material of the third layer comprises aluminium without hafnium and without yttrium, and wherein the first layer is sandwiched between the second layer and the third layer. 
     
     
         25 . The superalloy component as claimed in  claim 22 , wherein content of hafnium in the first layer is less than or equal to 3% by weight of the layer components. 
     
     
         26 .  11 . The superalloy component as claimed in  claim 22 , wherein content of yttrium in the first layer is is less than or equal to 0.17% by weight of the layer components. 
     
     
         27 . The superalloy component as claimed in  claim 22 , wherein the coating comprises at least one layer that further comprises silicon in addition to aluminium. 
     
     
         28 . The superalloy component as claimed in  claim 27 , wherein content of silicon of the at least one layer is between 1% and 40% by weight of the layer components.