stresses to be able to withstand the temperatures which prevail there they have to be cooled by means of a coolant substrates of the components may likewise have a directional structure i e they are in single crystal form sx structure or have only longitudinally oriented grains ds structure by way of example iron base nickel base or cobalt base superalloys are used as material for the components in particular for the turbine blade or vane 120 130 and components of the combustion chamber 110 superalloys of this type are known for example from ep 1 204 776 b1 ep 1 306 454 ep 1 319 729 a1 wo 99 67435 or wo 00 44949 these documents form part of the disclosure the blades or vanes 120 130 may also have coatings which protect against corrosion mcralx m is at least one element selected from the group consisting of iron fe cobalt co nickel ni x is an active element and represents yttrium y and or silicon and or at least one rare earth element or hafnium alloys of this type are known from ep 0 486 489 b1 ep 0 786 017 b1 ep 0 412 397 b1 or ep 1 306 454 a1 which are intended to form part of the present disclosure a thermal barrier coating consisting for example of zro 2 y 2 o 3 u2014.