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A Method for Measuring the Bonding Layer Thickness of Thermal Barrier Coatings Based on Impedance Coordinate Transformation

A technology of thermal barrier coating and coordinate transformation, applied in the direction of electric/magnetic thickness measurement, electromagnetic measuring device, complex mathematical operation, etc., can solve the problems of high configuration and complex algorithm, achieve high detection accuracy, simple and feasible operation, The effect of low environmental requirements

Active Publication Date: 2022-06-24
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide an eddy current detection method for the thickness of the bonding layer of thermal barrier coatings, which can overcome the problems of high mechanical configuration and complicated algorithms involved in the existing coating thickness measurement, and can better decouple the influence of ceramic layer thickness Effect

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  • A Method for Measuring the Bonding Layer Thickness of Thermal Barrier Coatings Based on Impedance Coordinate Transformation
  • A Method for Measuring the Bonding Layer Thickness of Thermal Barrier Coatings Based on Impedance Coordinate Transformation
  • A Method for Measuring the Bonding Layer Thickness of Thermal Barrier Coatings Based on Impedance Coordinate Transformation

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[0029]The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top / bottom", etc. are based on the orientations shown in the accompanying drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device ...

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Abstract

The invention discloses a method for measuring the thickness of a bonding layer of a thermal barrier coating based on impedance coordinate transformation. The steps include: firstly, using a standard test piece to obtain the included angle between the thickness of the ceramic layer and the changing direction of the thickness of the bonding layer on the impedance coordinate system , according to the included angle, perform the first impedance coordinate transformation of the test piece to obtain its impedance coordinates that are not affected by the ceramic layer; then, use the established relationship between the thickness of the bonding layer and the impedance phase to calculate the thickness of the bonding layer ; And then, use the relationship between the thickness of the adhesive layer and the included angle to correct the included angle, do the second impedance coordinate transformation, and finally calculate the thickness of the adhesive layer after the correction; the present invention uses the impedance coordinate transformation method to solve the current In thermal barrier coating thickness measurement, it is difficult to decouple the signals of the bonding layer and the ceramic layer, and the thickness of the bonding layer can be measured, which greatly improves the detection efficiency.

Description

technical field [0001] The invention relates to a method for measuring the thickness of a thermal barrier coating adhesive layer based on impedance coordinate transformation, and belongs to the field of conventional eddy current testing. Background technique [0002] The thermal barrier coating consists of a ceramic layer, a bonding layer and a nickel-based superalloy matrix. It is covered on aero-engine turbine blades to improve the safety of turbine blades working in extremely harsh environments such as high temperature, high pressure, high stress, and high speed. performance and longevity. With the increase of service time, the thickness of the adhesive layer and the thickness of the ceramic layer will be reduced, and oxidized at high temperature to produce oxides, resulting in poor thermal insulation, and more seriously, the ceramic layer will fall off, resulting in thermal barrier coating failure. . Therefore, the detection of thermal barrier coating thickness plays a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06G06F30/20G06F17/15
CPCG01B7/06G06F30/20G06F17/15
Inventor 曹丙花徐闯范孟豹吕珊珊
Owner CHINA UNIV OF MINING & TECH
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