METHOD FOR TESTING HEAT-SHIELDING COATINGS Russian patent published in 2023 - IPC G01N25/72 G01N3/56 G01N3/60 G01N25/58 

FIELD: technical physics; method for testing heat-shielding coatings.

SUBSTANCE: invention can be used to determine the cyclic durability of multilayer ceramic heat-shielding coatings used to protect machine parts from high temperatures, in particular blades of aircraft gas turbine engines (GTE) and power plants. The essence of the invention consists in the implementation of a thermal cycling effect on the sample by heating from the side of the heat-shielding coating and simultaneous cooling from the side opposite to the heat-shielding coating and ensuring the creation of a steady temperature gradient. The sample is held when the maximum and minimum temperatures of the thermal cycling effect are reached, respectively, and mechanical action on the sample is carried out synchronously with the temperature change by applying a load. The level of deformations in the sample is fixed, and in cycles a constant level of maximum deformation is maintained at the maximum temperature, and a constant level of minimum deformation is maintained at a minimum temperature, and, accordingly, when holding at a maximum temperature a constant level of minimum deformation is maintained, and at a minimum temperature — a constant level of maximum deformations. During the test, the surface of the heat-shielding coating is exposed to a stream of abrasive particles at an angle of 30° up to 90°.

EFFECT: ensuring the reproduction of the operating mode of thermomechanical loading, the mechanism of damage and destruction of the coating of the heat-shielding coating on machine parts.

1 cl, 2 dwg