in addition to good thermal barrier properties , thermal barrier coating systems also have to have a long thermal barrier coating service life . the coating system according to the invention comprises a specially adapted layer sequence made up of metallic bonding layer , which consists of an nicocralx , inner ceramic layer and outer ceramic layer , at least 80 % of which is made up of the pyrochlore phase gd 2 zr 2 o 7 or gd 2 hf 2 o 7 .