Use of a thermal spray method for the manufacture of a heat insulating coat

A machine component comprising one or more layered heat insulating coats of which layers are manufactured at least partly using a thermal spray method for the manufacture of a layer for a heat insulating coat of a material in powder form that consists of at least 80 mol % of zirconium silicate ZrSiO4 wherein a majority of powder particles have diameters in the range between 10 and 100 μm, and wherein the particles are at least partially melted through a gas flow under reducing conditions and at a temperature greater than 2000° C., the method comprising choosing method parameters, including a dwell time of the particles in a heat imparting medium and a temperature of the heat imparting medium and momentum that are transferred to the particles, in such a manner that the layer that is formed of the particles has a structure with lamellar elements, using suitable gases or gas mixtures as reducing means for the liberation of gases containing silicon;

• wherein the layers have an atomic ratio of Zr to Si that is greater than 1.1;
• wherein constituents with amorphous SiO2 phase are not present or are smaller than approximately 6% by weight, proportions of ZrSiO4 are smaller than 10% by weight, proportions of monoclinic ZrO2 are smaller than 10% by weight, ZrO2 are present mainly stabilized in cubic and/or tetragonal modifications and Si are partly dissolved in the ZrO2, and wherein the outer layer consists of at least partly stabilized ZrO2;
• wherein the heat insulating coat forms part of a layer compound material, with the heat insulating coat being bonded via an adhesive ground to a substrate and the adhesive ground consists of a metallic alloy;
• and
• wherein the metallic alloy is MCrAIX, with M=Ni, Co, NiCo, CoNi or Fe, and X=Y, Hf Pt, Pa, Re, Si or a combination thereof.