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Abstract

The use of a thermal spray method relates to the production of a layer (20) for a heat insulating coat of a material (10) in powder form. This material consists at least to 80 mol % of zirconium silicate ZrSiO.sub.4, in particular of the mineral zircon, and the majority of its powder particles (1) have diameters in the region between 10 and 100 .mu.m. During the spraying on the particles are at least partially melted through in a gas flow (42) under reducing conditions and at a temperature greater than 20000.degree. C. Method parameters, among others the dwell time of the particles in a heat imparting medium, in particular a plasma (41) or a flame, the temperature of the heat imparting medium and the momentum transferred to the particles, are chosen in such a manner that the layer (20) which is formed of the particles has a structure with lamellar elements (21). Suitable gases or gas mixtures, preferably hydrogen, are used as reducing means for the liberation of gases containing silicon, in particular silicon monoxide SiO; and/or a thermal liberation of gases containing silicon takes place as a result of a high temperature of the heat imparting medium.

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