US2016251971A1PendingUtilityA1

Two-ply ceramic layer with different microstructures

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Assignee: SIEMENS AGPriority: Oct 22, 2013Filed: May 13, 2014Published: Sep 1, 2016
Est. expiryOct 22, 2033(~7.3 yrs left)· nominal 20-yr term from priority
Inventors:Jens Bay DüsterhöftClaus HeuserMatthias RichterWerner Stamm
C23C 28/3455F01D 5/288F04D 29/542C23C 28/3215C23C 28/042F05D 2220/323F05D 2230/312F05D 2220/31C23C 4/134F04D 29/324F05D 2300/611C23C 4/11F05D 2300/5023F01D 9/02C23C 4/10Y02T50/60
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Claims

Abstract

A two-ply heat-insulating ceramic layer is provided with a highly porous crackfree lower ply and an outermost heat-insulating ply with vertical cracks in order to ensure both a high heat insulation as well as a high erosion resistance. In one aspect is a layer system having a two-ply, outermost ceramic layer, which has a lower ceramic layer and an outermost ceramic layer. The lower ceramic layer has a porosity of at least 5%, in particular at least 8%, very particularly preferably at least 10%, and barely any or no vertical cracks, in particular no vertical cracks running right through, and the outermost ceramic layer has a layer thickness of not more than 40%, in particular not more than 20%, very particularly preferably not more than 10% of the layer thickness of the lower ceramic layer.

Claims

exact text as granted — not AI-modified
1 . A layer system
 having a two-ply, outermost ceramic layer,   which has a lower ceramic layer and   an outermost ceramic layer,   wherein the lower ceramic layer has a porosity of at least 5%,   and   is substantially free of vertical cracks running therethrough,   and the outermost ceramic layer has a layer thickness of not more than 40%,   of the layer thickness of the lower ceramic layer.   
     
     
         2 . The layer system as claimed in  claim 1 , wherein the outermost ceramic layer has a minimum layer thickness of 30 μm. 
     
     
         3 . The layer system as claimed in  claim 1 , wherein the outermost ceramic layer has a maximum layer thickness of 500 μm. 
     
     
         4 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply ceramic layer has a porosity of 12+ or −4% and in particular has a layer thickness of up to 1 mm. 
     
     
         5 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply ceramic layer has a porosity of 15+ or −4% and in particular has a layer thickness of up to 1 mm. 
     
     
         6 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply ceramic layer has a porosity of 20+ or −4% and has a layer thickness of up to 1.5 mm. 
     
     
         7 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the ceramic layer has a porosity of 25+ or −5% and has a layer thickness of >1.5 mm. 
     
     
         8 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer has a porosity of >15%. 
     
     
         9 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the thermal barrier layer has a ductile columnar structure. 
     
     
         10 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply ceramic thermal barrier layer has been produced by an APS process. 
     
     
         11 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply ceramic thermal barrier layer has been produced by spraying of ceramic powders with polymers. 
     
     
         12 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer of the two-ply, ceramic thermal barrier layer has been produced by suspension plasma spraying. 
     
     
         13 . The layer system as claimed in  claim 1 , wherein the materials for the lower ceramic layer and of the outermost ceramic layer are selected from among: zirconium oxide, partially stabilized or fully stabilized, and pyrochlores. 
     
     
         14 . The layer system as claimed in  claim 1 , wherein the two-ply ceramic layer is the outermost layer. 
     
     
         15 . The layer system as claimed in  claim 1 , wherein the lower ceramic layer has a minimum thickness of at least 100 μm. 
     
     
         16 . The layer system as claimed in  claim 1 , wherein the outermost ceramic layer is dense and has a porosity of less than 8%. 
     
     
         17 . The layer system as claimed in  claim 1 , wherein the outermost ceramic layer has cracks running vertically through it.

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