Nickel based alloys to prevent metal dusting degradation

Abstract

An article of manufacture for reducing susceptibility of a metal pipe to metal dusting degradation. The article includes a multi-layer tubing having an alloy layer and a copper layer. The alloy layer can include a Ni based, an Al based and an Fe based alloy layer. In addition, layers of chrome oxide, spinel and aluminum oxide can be used.

1 . An article of metallic material manufacture for reducing susceptibility to metal dusting degradation, comprising a nickel base alloy comprising (in weight percentage) Cr of about 22-29, Al of about 2.0-3.5, Fe of about 0-1.0; Ti of about 0-0.3, Zr of about 0.1-0.2, Y of about 0-0.1 and the balance Ni.  
     
     
         2 . The article as defined in  claim 1  wherein the nickel alloy contains iron less than about one percent.  
     
     
         3 . The article as defined in  claim 1  further including a multi-layer tubing for passage of material therein and said tubing including a copper layer adjacent said nickel base alloy.  
     
     
         4 . The article as defined in  claim 3  wherein the multi-layer tubing includes an in-situ-developed chromium oxide layer.  
     
     
         5 . The article as defined in  claim 3  further including an aluminum oxide layer disposed adjacent the chromium oxide layer.  
     
     
         6 . The article as defined in  claim 3  wherein the multi-layer tubing further includes at least one of an aluminum oxide layer, a Fe (Cr 1-x Fe x ) 2 O 4  layer with high chromium to iron ratio, and a substrate consisting essentially of copper, a Ni-based alloy layer and an Fe-based alloy layer.  
     
     
         7 . An a multi-layer article of manufacture having a metallic layer with reduced susceptibility to metal dusting degradation, comprising: 
 a tubing having multiple layers, the multi-layer tubing having a hollow passageway allowing for passage of material therein; and    said multi-layer tubing including a copper alloy layer having a composition including at least copper; and    said nickel alloy layer comprising (in weight percentage) Cr of about 22-29, Al of about 2.0-3.5, Fe of about 0-1.0; Ti of about 0-0.3, Zr of about 0.1-0.2, Y of about 0-0.1 and the balance Ni;    wherein said copper layer is positioned in said multi-layer tubing such that it will be exposed to a metal dusting degradation environment    
     
     
         8 . The article as defined in  claim 7  wherein the copper alloy layer is the innermost layer of the multi-layer tubing.  
     
     
         9 . The article as defined in  claim 7  wherein the copper alloy layer is bonded to the nickel alloy layer.  
     
     
         10 . (canceled)  
     
     
         11 . The article as defined in  claim 7  wherein the multiple layers are selected from the group consisting of bonded layers and unbonded layers.  
     
     
         12 . The article as defined in  claim 7  wherein the multi-layer tube has at least two bonded layers and at least one of the bonded layers is comprised of a low melting point metal.  
     
     
         13 . The article as defined in  claim 12  wherein the low melting point metal comprises at least one of zinc, silver, tin, and cadmium.  
     
     
         14 . The article as defined in  claim 7  wherein the thickness of the copper alloy layer is greater than about 0.1 mm.  
     
     
         15 . The article as defined in  claim 7  wherein the copper alloy comprises weight percentages of copper in the range of about 50-90, aluminum about 2-20, and nickel about 4-20.  
     
     
         16 . The article as defined in  claim 15  further comprising an oxide layer including at least one of in-situ-developed Cr2O3 and FeCr2O4.  
     
     
         17 . The article as defined in  claim 7  wherein the nickel alloy layer further includes aluminum.  
     
     
         18 . An article of manufacture for reducing susceptibility to metal dusting degradation, comprising: 
 a multi-layer metallic component for use in a corrosive atmosphere the component containing carbon.    
     
     
         19 . The article as defined in  claim 18  wherein the multi-layer metallic component further includes at least one of a Ni alloy and an Fe alloy layer.  
     
     
         20 . The article as defined in  claim 18  wherein the multi-layer metallic component further includes a cobalt alloy layer and no nickel alloy layer or iron alloy layer.