Method for measuring coating thickness and interfacial roughness simultaneously by ultrasonic

A coating and ultrasonic technology, which is applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of difficulty in characterizing thickness and roughness, inappropriate for coating layer and substrate interface roughness measurement, etc.

Active Publication Date: 2014-12-10
DALIAN UNIV OF TECH
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Problems solved by technology

However, none of the above methods are suitable for the roughness measurement of the coating layer and the substrate interface.
The preparation process of the coating layer will also lead to changes in the

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  • Method for measuring coating thickness and interfacial roughness simultaneously by ultrasonic
  • Method for measuring coating thickness and interfacial roughness simultaneously by ultrasonic
  • Method for measuring coating thickness and interfacial roughness simultaneously by ultrasonic

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Embodiment Construction

[0029] A method for simultaneously measuring the thickness of the coating layer and the roughness of the internal interface by ultrasonic waves, using figure 2 The one shown includes a sample table (1), a rough coating layer sample on the inner interface (prepared by shot blasting on the surface of a Ni-based superalloy, the thickness of the thin layer is about 0.5-0.7 mm, and the nominal roughness values ​​are 8 μm and 14 μm respectively. With 3 tested samples of 28μm, the back of the sample is ground flat with 2000# sandpaper, and polished to eliminate the influence of back fluctuations) (2), the nominal frequency is 20MHz delay block probe, and the chip diameter is 6mm (3) , USIP40 flaw detector (4), DPO4O32 digital oscilloscope (5) and ultrasonic pulse echo detection system of computer (6);

[0030] It uses the following measurement steps:

[0031](1) Connect the delay block probe to the system and calibrate the instrument. The reflected sound pressure of the delay bloc...

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Abstract

The invention discloses a method for measuring coating thickness and interfacial roughness simultaneously by ultrasonic and belongs to the technical field of ultrasonic nondestructive test and evaluation for materials. The method adopts an ultrasonic pulse echo detection system which comprises a sample table, an interfacial roughened coating sample, a delay block probe, a flow detector, a digital oscilloscope and a computer. Aiming to solve the difficult problem about measuring thickness and roughness of the nondestructive characterization interfacial roughened coating, the method includes deriving a sound pressure reflection coefficient amplitude spectrum /r(f;rq,d)/of the interfacial roughened coating structure, performing correlation operation to theoretical and experimental sound pressure reflection coefficient amplitude spectrums of different frequency bandwidth to obtain thickness di and roughness Rqi of the coating corresponding to the maximum correlation coefficient eta<max>(Rq,d) of each bandwidth, averaging thickness and roughness measured within different frequency windows to obtain mean d and mean Rq which are respectively the coating thickness and the interfacial roughness needed to solve. The method fills a gap in the coating thickness and roughness nondestructive characterization methods.

Description

technical field [0001] The invention relates to an ultrasonic method for simultaneously measuring the thickness of a coating layer and the roughness of an inner interface, which belongs to the technical field of ultrasonic nondestructive testing. Background technique [0002] Practice has shown that interface roughening is an effective measure to improve the bonding strength of the interface, and it is also an effective measure to improve the stress impact resistance, thermal corrosion resistance and service life of the coating layer during service. The degree of roughness directly affects the interfacial bonding strength, interfacial residual stress, and the degree of interface oxidation, etc., and the residual tensile stress caused by roughness may lead to cracking and peeling of the coating layer, which means that interfacial roughness not only enhances interfacial bonding, but also introduces Factors that are unfavorable to the life of the interface. Therefore, reasonab...

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Application Information

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IPC IPC(8): G01B17/02G01B17/08
Inventor 林莉马志远赵灿罗忠兵雷明凯
Owner DALIAN UNIV OF TECH
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