Non-contact nondestructive testing method and non-contact nondestructive testing device for thermal insulation temperature of thermal barrier coating

Abstract

The invention discloses a non-contact nondestructive testing method and a non-contact nondestructive testing device for thermal insulation temperature of a thermal barrier coating. The method belongsto the technical field of nondestructive testing, and comprises the following steps: simulating a real service environment, heating the surface of a ceramic layer of the thermal barrier coating, cooling a high-temperature alloy matrix surface, and measuring the temperatures of a ceramic top layer of a high-temperature alloy component with the thermal barrier coating and the interface between the back surface of the ceramic layer and a metal bonding layer by using an infrared thermometer. Compared with an existing thermocouple contact temperature testing technology, the method has the advantages that non-contact measurement is achieved, so an original gas flow field and an original temperature field on the surface of the thermal barrier coating and in an air channel of the hollow blade arenot affected; temperature testing response is fast, the testing process is simple, and the method is high in practicability.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to an infrared temperature testing method, in particular to a non-contact non-destructive testing method and device for the heat insulation temperature of a thermal barrier coating. Background technique [0002] Thermal barrier coatings (TBCs: Thermal Barrier Coatings) are widely used in aero-engine and gas turbine superalloy hot-end parts for high-temperature heat insulation protection for superalloy parts, and can significantly improve the conversion efficiency of aero-engines and gas turbines. The thermal barrier coating is composed of a metal bonding layer and a ceramic heat-insulating top layer. The main component of the metal bonding layer is MCrAlY (M=Ni, Co) or NiAlPt, which mainly plays a role in resisting high-temperature oxidation and relieving the ceramic heat-insulating top layer and high-temperature alloy. The effect of mismatching thermophysical properti...

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Problems solved by technology

In terms of coating surface heating means, radiation heating in the furnace is used, which is different from the heat transfer mode of the actual hot plate gas convection, supplemented by high-temperature radiation; in terms of testing means, the heat conduction of the armored shell has a certain delay, and the thermocouple itself It will affect the airflow field and temperature field on the surface of the coating and the substrate side, resulting in delay and uncertainty in the test data;

In terms of the test environment, it is difficult to change the gas characteristics, the interaction between coating insulation and gas film holes cannot be considered, and the actual blade service conditions such as calcium magnesium silicon oxide particles cannot be added, which are quite different from the blade service state, and it is difficult to characterize the coating insulation. heat effect

In terms of test content, only short-term heat insulation performance can be measured, without considering the influence of service time, environment, and coating thickness on heat insulation effect; in terms of applicability, it is difficult to meet the measurement of heat insulation effect distribution on the entire surface of blades with complex profiles

The above factors make it very difficult to evaluate the thermal insulation effect of coatings under different working conditions in the design of turbine air-cooled blades. This engineering problem needs to be solved urgently

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