METHOD OF DETERMINING STRENGTH PROPERTIES OF HIGH-TEMPERATURE HEAT-INSULATING COATINGS AND DEVICE TO THIS EFFECT Russian patent published in 2008 - IPC G01M15/14 

FIELD: engines and pumps, physics.

SUBSTANCE: in compliance with the proposed method, the turbine blade or whatever turbine component is accelerated by centrifugal force, after it reaches a preset maximum cycle temperature, the acceleration being equal to the centrifugal acceleration and acting towards its edge and the blade being coated with a heat-insulating coating, primarily of columnar structure, to reach a forecast maximum damage of the said coating. This allows loading the heat-insulating coating with an inertial load causing the fiber bent equal in amount to that originating in operation at operating temperature. The cyclic tests made under the aforesaid conditions allow determining, in due time, the blade cyclic life in the lab conditions. In operation, the blade is subjected, primarily, to thermal strains originating because of not-uniform heating. The simulation of the above described conditions can be realised in heating the specimen rigidly fixed between the membranes of higher rigidity. The said membranes prevent an unobstructed specimen expansion in heating creating the compression strains exceeding the plastic deformation level. Then, during the cooling semi-cycle, stretching strain originates in the specimen exceeding its limit of elasticity. As a result, the specimen gets destructed under cyclic loads.

EFFECT: lower costs of development of new heat-insulating coatings and blades, longer life of aircraft gas turbine engines.

3 cl, 3 dwg