Coating of a functional component that is subject to thermal loads and erosion, mold-release agent and method for producing said coating

A metallic functional component, which is subject to thermal or thermal and erosive stress and to which on at least one surface a coating is applied, from a binder phase, which consists at least largely of a phosphate, and a material embedded in the binder phase, characterized in that the functional component is part of an internal combustion engine and that the binder phase is bound chemically to the base material of the functional component and that the binder phase is formed of a polymer of polymerized monoaluminum phosphate and/or monozinc phosphate and/or monomagnesium phosphate and/or sodium phosphate and/or boron phosphate, the material embedded in the binder phase is a structural part in the form of Al2O3 and/or SiO2 and/or TiO2 and/or ZrO2 in a fraction of 80 nm to 200 nm, and the material embedded in the binder phase is formed of primary parts in the form of Al2O3, SiO2, ZnO, ZrO2, CeO, and TiO2 in a fraction of 2 nm to 80 nm, whereby the primary parts are inserted in the gaps between the structural parts, and the primary parts and the structural parts are surrounded by the polymer, and at least traces of an organic binder, preferably of gelatin, are detectable in the coating.