Heat-insulation material and arrangement of a heat-insulation layer containing said heat-insulation material

Abstract

A heat-insulation material for a heat-insulation layer ( 3 ) for a carrier body ( 2 ) for preventing heat transfer between the carrier body and a surrounding area ( 7 ) therearound includes at least one luminous substance which is excitable for emitting luminescent light having a defined emission wavelength and includes at least one type of metal oxide containing at least one trivalent metal (A). Also described is an arrangement of at least one heat-insulation layer which contains the heat-insulation material and is applied to the carrier body. The described heat-insulation material is characterised in that the metal oxide is embodied in the form of a mixed oxide selected in a perovskite group of total formula AA′O 3 , and/or of pyrochlore of total formula A 2 B 2 O 7 , wherein A′ is the trivalent metal and B is a tetravalent metal. The heat-insulation layer containing the heat-insulation material is preferably used for a gas turbine.

1 . Thermally insulating material for a thermal barrier coating ( 3 ) of a substrate ( 2 ) for limiting heat transfer between the substrate ( 2 ) and an environment ( 7 ) of the substrate ( 2 ), wherein 
 the thermally insulating material has at least one luminophore which can be excited to emit luminescent light with a particular emission wavelength, and    the luminophore has at least one metal oxide with at least one trivalent metal A,    characterized in that    the metal oxide is a mixed oxide selected from the perovskite group with the empirical formula AA′O 3  and/or a pyrochlore with the empirical formula A 2 B 2 O 7 , A′ being a trivalent metal and B a tetravalent metal.    
   
   
       2 . Thermally insulating material according to  claim 1 , wherein the luminophore for exciting the emission of luminescent light has an activator selected from the cerium and/or europium and/or dysprosium and/or terbium group.  
   
   
       3 . Thermally insulating material according to  claim 2 , wherein the activator is present in the luminophore in a proportion of up to 10 mol %.  
   
   
       4 . Thermally insulating material according to  claim 1 , wherein the trivalent metal A and/or the trivalent metal A′ is a rare earth element Re.  
   
   
       5 . Thermally insulating material according to  claim 4 , wherein the trivalent metal A and/or the trivalent metal A 1  is a rare earth element selected from the lanthanum and/or gadolinium and/or samarium group.  
   
   
       6 . Thermally insulating material according to  claim 1 , wherein the perovskite is a rare earth element.  
   
   
       7 . Thermally insulating material according to  claim 6 , wherein the empirical formula of the rare earth aluminate is Gd 0.25 La 0.75 AlO 3 .  
   
   
       8 . Thermally insulating material according to  claim 1 , wherein the pyrochlore is selected from the rare earth hafnate and/or rare earth titanate and/or rare earth zirconate group.  
   
   
       9 . Thermally insulating material according to  claim 8 , wherein the rare earth zirconate is selected from the gadolinium zirconate and/or samarium zirconate group.  
   
   
       10 . Thermally insulating material according to  claim 8 , wherein the rare earth hafnate is lanthanum hafnate.  
   
   
       11 . Arrangement of at least one thermal barrier coating ( 3 ) on a substrate ( 2 ) for limiting heat transfer between the substrate ( 2 ) and an environment ( 7 ) of the substrate ( 2 ), wherein the thermal barrier coating has a thermally insulating material according to  claim 1 .  
   
   
       12 . Arrangement according to  claim 11 , wherein at least one additional thermal barrier coating ( 5 ) is present which is essentially luminophore-free.  
   
   
       13 . Arrangement according to  claim 12 , wherein the additional thermal barrier coating ( 5 ) is essentially opaque to excitation light for exciting the emission of luminescent light and/or to the luminescent light of the luminophore.  
   
   
       14 . Arrangement according to  claim 13 , wherein the thermal barrier coating ( 3 ) is disposed between the substrate ( 2 ) and the additional thermal barrier coating ( 5 ) in such a way that the luminescent light of the luminophore can essentially only pass through orifices ( 6 ) in the additional thermal barrier coating ( 5 ) into the environment ( 7 ) of the substrate ( 2 ).  
   
   
       15 . Arrangement according to  claim 11 , wherein the substrate is a component of an internal combustion engine.  
   
   
       16 . Arrangement according to  claim 15 , wherein the internal combustion engine is a gas turbine.  
   
   
       17 . Thermally insulating material according to  claim 2 , wherein the perovskite is a rare earth element.  
   
   
       18 . Thermally insulating material according to  claim 3 , wherein the perovskite is a rare earth element.  
   
   
       19 . Thermally insulating material according to  claim 2 , wherein the perovskite is a rare earth element.  
   
   
       20 . Thermally insulating material according to  claim 3 , wherein the perovskite is a rare earth element.