Ultrasonic guided wave detection method for bonding strength of coating

Abstract

The invention discloses an ultrasonic guided wave detection method for coating bonding strength, which comprises the following steps of manufacturing a ten-stage square bonding sample for ultrasonic guided wave detection, setting up a special ultrasonic guided wave coating bonding strength detection system, calculating the ultrasonic guided wave method bonding strength coefficient of the ten-stage square bonding sample, performing a coating strength tensile test on a ten-stage square bonding sample for ultrasonic guided wave detection, calculating equivalent bonding strength, performing ultrasonic guided wave detection on an actual detected piece, and calculating a coating bonding strength value. The method provided by the invention overcomes the inherent defects of large near-field blind area, many clutter signals of the bonding surface, low detection resolution, great influence on the sound transmission of the matrix and the like of the existing ultrasonic longitudinal wave detection method, and can perform numerical quantification on the tensile test detection result of the bonding coating strength, thereby realizing graded evaluation of the bonding strength of the coating and the matrix of the workpiece. The detection process is low in cost, destructive evaluation of auxiliary equipment or related materials is not needed, and the method has a very positive effect on evaluation of the coating combination quality monitoring of the detected piece.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of coating bonding strength, in particular to an ultrasonic guided wave testing method of coating bonding strength. Background technique [0002] Coating technology is an important technology in modern material surface strengthening treatment technology, which is widely used in the manufacture and repair of aerospace, weapons, power equipment, and engines of transportation equipment. [0003] A good bond (high bond strength) between the coating and the base material is the most important prerequisite for the function of the coating. Indentation method, swelling method, torsion method, stretching, bending and other mechanical methods are usually used to measure the bonding strength of the interface between the coating and the substrate, but it will cause certain damage to the material itself. Non-destructive testing methods for indestructible sampling and coating bonding strength o...

AI Technical Summary

Problems solved by technology

[0016] Aiming at the deficiencies in the existing detection methods, the present invention provides an ultrasonic guided wave detection method for the bonding strength of the coating. The existing ultrasonic longitudinal wave detection method has inherent shortcomings such as large near-field blind area, many clutter signals on the joint surface, low detection resolution, and large additional influence of the matrix, so as to improve the accuracy of the detection results

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