A method for evaluating an application effect of a thermal barrier coat for a turbine blade

Abstract

A method for evaluating an application effect of a thermal barrier coat for a turbine blade includes the following steps of based on the temperature field distributions in the two computational domains of the thermal barrier coating and the turbine blade without the thermal barrier coating, calculating the maximum principal stress and the maximum shear stress data of the stress field of the thermal barrier coating by a preset program, obtaining the thermal barrier coating insulation efficiency, and obtaining the local comprehensive and global comprehensive evaluation factors of the thermal barrier coating. The method of the invention realizes the simulation method of the thermal barrier coating of a three-dimensional turbine blade with an air film hole. A parameter for evaluating the application effect of thermal barrier coatings (TBCs) is established, which can reflect the comprehensive application performance of TBCs more comprehensively, and is more conducive to the design and analysis of TBCs from the two aspects of thermal insulation efficiency and stress level.

Description

technical field [0001] The invention relates to the technical field of a heat-insulating protective coating system in a high-performance aero-engine, in particular to an evaluation method for the application effect of a turbine blade thermal barrier coating. Background technique [0002] Thermal barrier coatings (TBCs) are ceramic coatings that are deposited on the surface of high temperature resistant metals or superalloys. The thermal barrier coating plays a role of heat insulation for the base material, which can reduce the base temperature, so that the engine turbine blade can operate at high temperature, and has the characteristics of high melting point, low thermal conductivity, corrosion resistance, and thermal shock resistance. During high-temperature service, thermal barrier coatings can protect high-temperature substrates, increase the temperature and thermal efficiency of heat engines, and thus are widely used in the fields of aviation, chemical industry, metallur...

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Problems solved by technology

In addition, due to the harsh service environment, the thermal barrier coating may peel off and fail during the application process, resulting in the blade base being exposed to high-temperature gas, resulting in huge losses and disasters. Therefore, the service life restricts the application and development of thermal barrier coatings another key question

[0004] The thermal insulation performance and service life of thermal barrier coatings are two very important parameters, which have been studied and predicted in large quantities, and stress is the most important factor affecting service life. However, due to the complexity of the blade structure, thermal barrier coatings in Under different working conditions, the thermal insulation performance may be good but the stress is too high, resulting in a low service life, and the stress may be low but the thermal insulation performance is not good, leading to early failure of the base blade, which makes the design and application of thermal barrier coatings at the expense of the other, causing huge difficulties

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