Patent ID: 7462393

Claim:
A spray powder for the manufacture of a thermally insulating layer produced on a substrate by means of a thermal spraying process, wherein the substrate has already been coated with a single- or multi-layer part coating, and wherein at least one thermally insulating functional material is used, which on the one hand has a lower thermal conductivity than the substrate and on the other hand forms a chemically and thermally stable phase at elevated temperatures, characterized in that the spray powder comprises particles which have an agglomerated microstructure formed by a plurality of granules adhering to each other, the granules being made of the at least one functional material, and at least one further component made of an additive or a plurality of additives, the further component being distributed finely dispersed on surfaces of the functional material granules, the further component exerting a retarding or eliminating effect with regard to sintering compounds which form between the functional material granules, wherein surfaces of the granules comprise micro-pores that produce low mass boundary zones where the granules contact each other.