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Microwave phase detection method for porosity of thermal barrier coating

A technology of thermal barrier coating and phase detection, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem that the porosity of thermal barrier coating cannot be quickly, accurately, and pollution-free

Active Publication Date: 2014-01-01
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the current situation that the porosity of the thermal barrier coating cannot be quickly, accurately, pollution-free, and in-situ detection. Testing method of coating porosity

Method used

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  • Microwave phase detection method for porosity of thermal barrier coating
  • Microwave phase detection method for porosity of thermal barrier coating
  • Microwave phase detection method for porosity of thermal barrier coating

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Embodiment Construction

[0024] In conjunction with the content of the method of the present invention, the following examples of detecting the porosity of thermal barrier coatings by microwave phase method are provided, and the specific steps are as follows:

[0025] a. Use a microwave network analyzer to measure the reflection coefficient amplitude A and phase φ of the thermal barrier coating. The thickness of the measured thermal barrier coatings with different porosity is 400mm. figure 2 , image 3 Respectively, the relationship curves of microwave reflection coefficient amplitude, phase and operating frequency when detecting thermal barrier coatings with different porosities.

[0026] b. Calculation formula of reflection coefficient amplitude and the calculation formula of reflection coefficient phase φ = tan - 1 [ Im ( Γ ...

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Abstract

The invention relates to a method for measuring the porosity of a thermal barrier coating by a microwave reflection coefficient phase method, and belongs to the technical field of microwave nondestructive testing. The method comprises the following steps of: detecting the phase and amplitude of a microwave reflection coefficient of the thermal barrier coating by using a microwave network analyzer, calculating the porosity of the thermal barrier coating according to related formulas, and establishing the relation between the phase of the microwave signal reflection coefficient and the porosity of the thermal barrier coating so as to characterize the porosity of the thermal barrier coating by using the phase of the microwave reflection coefficient. The method is a nondestructive testing method; and by the method, thermal barrier coatings can be subjected to nondestructive and pollution-free testing.

Description

technical field [0001] The invention relates to a microwave phase detection method for the porosity of a thermal barrier coating, and belongs to the technical field of microwave nondestructive detection. Using inversion theory to calculate the relationship between the reflection coefficient phase of the microwave signal and the porosity of the thermal barrier coating, the function is to establish the corresponding relationship between the porosity of the thermal barrier coating and the phase of the microwave signal reflection coefficient, so that The coefficient phase is used to characterize the porosity of the thermal barrier coating. This method can realize the non-destructive and pollution-free detection of the thermal barrier coating. Background technique [0002] Due to the advantages of good heat insulation and oxidation resistance, thermal barrier coatings are widely used on hot end parts such as engine turbine blades. Porosity is one of the main factors affecting th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 何存富杨玉娥吴斌
Owner BEIJING UNIV OF TECH
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