Method for characterizing microstructure of nano-structure thermal barrier coating by adopting terahertz nondestructive testing technology

A technology of thermal barrier coating and nanostructure, which is applied in the direction of measuring device, phase influence characteristic measurement, permeability/surface area analysis, etc., can solve the influence of signal peeling, nanostructure thermal barrier coating has no certain qualitative or semi-quantitative Analytical methods, long detection cycle and other issues to achieve the effect of improving accuracy, avoiding discreteness, and shortening the detection time cycle

Active Publication Date: 2021-07-13
BEIJING GOLDEN WHEEL SPECIAL MACHINE +1
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, so far, there is no qualitative or semi-quantitative analysis method for the correlation characterization of the microstructure information (mainly porosity and unfused particles) of nanostructured thermal barrier coatings by terahertz nondestructive testing technology.
[0007] Therefore, it can be seen from the above that the traditional destructive testing method (quantitative metallographic method) has certain advantages for the detection method of the porosity and unfused particles of the nanostructured thermal barrier coating. Some non-destructive testing technologies (ultrasonic testing technology, infrared thermal wave testing technology, etc.) will be limited by testing cond...

Method used

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  • Method for characterizing microstructure of nano-structure thermal barrier coating by adopting terahertz nondestructive testing technology
  • Method for characterizing microstructure of nano-structure thermal barrier coating by adopting terahertz nondestructive testing technology
  • Method for characterizing microstructure of nano-structure thermal barrier coating by adopting terahertz nondestructive testing technology

Examples

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Embodiment 1

[0047] Example 1: Characterization of Unfused Particles of Nanostructured Coatings by Terahertz Nondestructive Testing Technology

[0048] This embodiment is based on the terahertz non-destructive testing method, taking the nanostructured 8YSZ type ceramic thermal barrier coating as an example, to describe the specific implementation of the terahertz characterization of the unfused particles of the nanostructured coating. The specific steps of the terahertz non-destructive testing technology to characterize the unfused particles of the nanostructure coating are as follows:

[0049] Step 1: Utilize the adjustment process to prepare a coating microstructure with a wide range of changes, and measure and analyze the unmelted particle content of the ceramic coating by a non-terahertz detection method (such as a quantitative metallographic method); preferably, based on the atmospheric plasma spraying process, 8YSZ ceramic coatings with different microstructural characteristics were ...

Embodiment 2

[0060] Example 2: Terahertz non-destructive testing technology to characterize the porosity of nanostructured coatings

[0061] This embodiment is based on the terahertz non-destructive testing method, taking the nanostructured 8YSZ type ceramic thermal barrier coating as an example, to describe the specific implementation of the terahertz characterization of the porosity of the nanostructured coating. The specific steps of the terahertz method for characterizing the porosity of nanostructured coatings are as follows:

[0062] Step 1: Use the adjustment process to prepare a wide range of coating microstructures, and measure and analyze the porosity of the ceramic coatings by quantitative metallography; preferably, 8YSZ ceramic coatings with different microstructural characteristics can be prepared based on the atmospheric plasma spraying process.

[0063] Specifically, relevant image processing methods and quantitative metallographic methods can be used to perform multi-group ...

Embodiment 3

[0073] Example 3: Characterization of Porosity and Unfused Particles of Nanostructured Coatings by Terahertz Nondestructive Testing Technology

[0074] This embodiment is based on the terahertz non-destructive testing method, taking the nanostructured 8YSZ type ceramic thermal barrier coating as an example, to describe the specific implementation of the terahertz characterization of the porosity of the nanostructured coating and the unfused particles. The specific steps of the terahertz non-destructive testing technology to characterize the porosity and unfused particles of the nanostructured coating are as follows:

[0075] Step 1: Utilize the adjustment process to prepare a coating microstructure with a wide range of changes, and measure and analyze the porosity and unfused particle content of the ceramic coating (preferably represented by the area ratio of unfused particles) by quantitative metallographic method; preferably, based on atmospheric plasma Spraying process to p...

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Abstract

The invention provides a method for characterizing the microstructure of a nano-structure thermal barrier coating by adopting a terahertz nondestructive testing technology, which comprises the following steps: preparing different microstructure coatings by adopting an adjusting process, and determining the microstructure characteristics of the coatings by adopting metallographic analysis; carrying out terahertz nondestructive testing to obtain the real refractive index of the ceramic coating; constructing a linear relation between the real refractive index and the coating microstructure characteristics; and based on the linear relation, constructing the range comparison relation between the real refractive index and the coating microstructure characteristics, wherein the coating microstructure characteristics of coatings prepared by different processes can be qualitatively or semi-quantitatively analyzed through terahertz nondestructive testing by utilizing the range comparison relation. The method has the characteristics of no damage, high efficiency, convenience in operation and high detection precision. Meanwhile, the data result of the method shows the characteristics that the data parameter rule guidance is clear, the data characterization method is simple, convenient, efficient and scientific, and powerful support can be provided for controlling the coating quality or providing rapid and effective nondestructive testing for process optimization.

Description

technical field [0001] The present invention relates to the technical field of terahertz non-destructive testing, especially the non-destructive testing technology for the microstructure of nanostructured thermal barrier coatings; specifically, it mainly relates to qualitative or semi-quantitative testing of ceramic coatings (porosity and unfused particle content) Signal characterization means and methods. Background technique [0002] The high-pressure turbine blades of aero-engines are covered with a thermal barrier coating (TBC) that is resistant to high temperature, corrosion and high heat insulation, which directly determines the overall quality and performance of aero-engines, and is also the core bottleneck technology restricting the development of the industry. Nano-structured thermal barrier coatings take advantage of the refinement of nano-ceramic grains to greatly improve toughness, strength and superplasticity, and have the characteristics of excellent thermal in...

Claims

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Application Information

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IPC IPC(8): G01N21/41G01N15/08
CPCG01N21/41G01N15/088Y02T50/60
Inventor 何箐王璐张振伟李建超张存林
Owner BEIJING GOLDEN WHEEL SPECIAL MACHINE
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