Thermal barrier coating bonding layer thickness measuring method 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, special data processing application, etc., can solve the problems of complex algorithm and advanced configuration, achieve high detection accuracy, simple and feasible operation, and detection The effect of low environmental requirements

Active Publication Date: 2022-01-14
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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  • Thermal barrier coating bonding layer thickness measuring method based on impedance coordinate transformation
  • Thermal barrier coating bonding layer thickness measuring method based on impedance coordinate transformation
  • Thermal barrier coating bonding layer thickness measuring method based on impedance coordinate transformation

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Embodiment Construction

[0029]The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to 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 drawings Or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must ha...

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Abstract

The invention discloses a thermal barrier coating bonding layer thickness measuring method based on impedance coordinate transformation, which comprises the following steps of: firstly, acquiring an included angle between the thickness of a ceramic layer and the thickness change direction of a bonding layer on an impedance coordinate system by using a standard test piece; performing first impedance coordinate transformation on a to-be-tested piece according to the included angle to obtain an impedance coordinate of the to-be-tested piece which is not influenced by the ceramic layer; then, calculating the thickness of the bonding layer by using the established relationship between the thickness of the bonding layer and the impedance phase; further, correcting the included angle according to the relation between the thickness of the bonding layer and the included angle, carrying out secondary impedance coordinate transformation, and finally calculating the corrected thickness of the bonding layer. According to the method, the problem that in current thermal barrier coating thickness measurement, signals of a bonding layer and a ceramic layer are difficult to decouple is solved by applying an impedance coordinate transformation method, the thickness of the bonding layer can be measured, and the detection efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method for measuring the thickness of a bonding layer of a thermal barrier coating based on impedance coordinate transformation, and belongs to the field of conventional eddy current detection. Background technique [0002] The thermal barrier coating is composed of a ceramic layer, a bonding layer and a nickel-based superalloy substrate, covering the turbine blades of the aeroengine, and is used to improve the safety of the turbine blades in extremely harsh environments such as high temperature, high pressure, high stress, and high speed. performance and service life. With the increase of service time, the thickness of the bonding 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, it will cause the ceramic layer to fall off, resulting in failure of the thermal barrier coating . Therefore, the detection o...

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Application Information

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Patent Type & Authority Applications(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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