Dvc-coating with fully and partially stabilized zirconia

Abstract

A dense vertical cracked microstructure in a ceramic layer system made of an underline partially stabilized zirconia layer and an above laying fully stabilized zirconia layer show good erosion resistance and long life time is provided.

1 . A ceramic layer system, at least comprising:
 a substrate made of a an inner partially stabilized zirconia layer and on it a fully stabilized zirconia layer, wherein vertical cracks are present.   
     
     
         2 . The ceramic layer system according to  claim 1 , wherein the fully stabilized zirconia layer is replaced partially or fully by a layer comprising or consisting of a pyrochlore material. 
     
     
         3 . The ceramic layer system according to  claim 1 , wherein the cracks are only present in the fully stabilized zirconia layer or the outer layer with the pyrochlore material. 
     
     
         4 . The ceramic layer system according to  claim 1 , wherein the cracks are present in both ceramic layers. 
     
     
         5 . The ceramic layer according to  claim 1 , wherein the porosity of the fully stabilized zirconia layer or the layer with the pyrochlore material is lower than 5%. 
     
     
         6 . The ceramic layer system according to  claim 1 , wherein the thickness of the partially stabilized zirconia layer is between 75 μm-800 μm. 
     
     
         7 . The ceramic layer system according to  claim 1 , wherein the thickness of the fully stabilized zirconia layer or the layer with the pyrochlore material is between 50 μm-800 μm. 
     
     
         8 . The ceramic layer system according to  claim 1 , wherein the zirconia or the zirconia layers are stabilized by yttria. 
     
     
         9 . The ceramic layer system according to  claim 1 , wherein the porosity of the partially stabilized zirconia layer is lower than 5%. 
     
     
         10 . The ceramic layer system according to  claim 1 , wherein the partially stabilized zirconia is stabilized by yttria. 
     
     
         11 . The ceramic layer system according  claim 1 , wherein the substrate is a metallic substrate. 
     
     
         12 . The ceramic layer system according  claim 1 , wherein the substrate has a metallic bond on the substrate. 
     
     
         13 . The ceramic layer system according  claim 1 , wherein the substrate is a NiCoCrAlY-based alloy.