METHOD OF APPLYING HEAT-PROTECTIVE COATING TO PARTS OF GAS TURBINE UNIT Russian patent published in 2024 - IPC C23C28/00 C23C4/06 C23C4/10 C23C4/134 

FIELD: heat-protective coating.

SUBSTANCE: invention relates to a method for applying a heat-protective coating to the parts of a power gas turbine plant. The working surface is pre-treated by plasma spraying to apply a metal heat-resistant sublayer made of an alloy of the MCrAlY system, where M = Ni, Fe, Co or a combination thereof, and an outer ceramic layer based on zirconium oxide, partially stabilized with 6-8 wt.% of yttrium oxide. Both heat-protective layers are applied by atmospheric plasma spraying using air as a plasma-forming gas. The metal heat-resistant sublayer is applied in a high-speed spraying mode with a plasma-forming air flow rate of at least 300 g/min, with a powder particle size of 15-45 microns, at a particle flow rate of at least 600 m/s, forming a coating porosity of less than 2%. The outer ceramic layer is applied in a low-speed, high-enthalpy air flow mode with a plasma-forming air flow rate of no more than 120 g/min with a powder particle size of 45-100 microns, forming a coating porosity of at least 25%.

EFFECT: service life of the gas turbine is increased by protecting it from high temperatures and erosion through the formation of durable heat-protective coatings.

1 cl, 2 dwg