Abstract: A method for producing a self-healing heat-insulating layer on a substrate by atmospheric plasma spraying (APS) of a heat-insulating-layer powder. The method includes introducing MoSi2 powder containing aluminum into a heat-insulating layer. The MoSi2 powder contains aluminum in a content of from 2 to 15 wt. %. The MoSi2 powder is used in a mass fraction of between 0.5 and 5 wt. % based on the heat-insulating layer. The method further includes injecting the heat-insulating-layer powder at a first point that is at a distance from a gun in the axial direction and injecting the MoSi2 powder into a plasma jet at a second point that is at a greater distance from the gun in the axial direction. An injection distance (I) of between 20 and 60 mm is set between the first and the second point.