Method and device for detecting bonding strength of coating interface based on strain disc technology

Abstract

The invention relates to the field of coating quality detection, particularly to a method and a device for detecting bonding strength of a coating interface based on the strain disc technology. A triaxial equiangular strain rosette is adopted for the real-time on-line detection of the strain variation of the coating at a loading point under the laser loading, the detected strain value is converted in real time into the stress intensity value of the loading point through program of an industrial computer, the destructive critical point of the interface can be obtained as per the obtained stress intensity time curve, and the interface bonding strength can be displayed through the stress intensity value corresponding to the destructive critical point of the coating interface. The method and the device can be used for quantitatively detecting the bonding strength of the coating interface at a fixed point, are simple to operate, and are highly reliable.

Description

technical field [0001] The invention relates to the field of coating quality detection, in particular to a detection method and device for coating interface bonding strength based on strain gauge technology. Background technique [0002] The interface bonding strength is an important mechanical performance index in the coating-substrate material system, which determines the reliability and service life of the coating-substrate material system to a large extent, and is also a matter of great concern in the coating preparation process; The methods commonly used to measure the bonding strength of the coating-substrate interface include: scratch method, indentation method, tensile method, shear method, bending method, laser spalling method, laser scratch method, etc.; these methods have certain limitations, have their own scope of application, and there is no one method suitable for various coating-substrate material systems; and the measurement data of the same method is unstab...

AI Technical Summary

Problems solved by technology

[0003] The technology close to the present invention is the laser scratching method, which is a novel coating interface bonding strength detection technology, such as the "Quasi-static Laser Scratching Measurement Method and Device for Interface Bonding Strength" with the authorization announcement number CN1296698C 》The surface of the coating or film specimen is loaded quasi-statically with a long pulse laser continuously loaded, the surface film is peeled off by the thermal effect of the laser, and the laser beam forms scratches on the film surface, and the laser energy corresponding to the peeling of the film-substrate interface is used to characterize the interface Bonding strength, this method is suitable for the determination of various hard tool films, decorative film systems, decorative functional films, DLC films, composite materials and other types of interfacial bonding strength, but there is also the critical position of film-based interface failure damage that cannot be determined in advance. Definite and impossible to make accurate judgments, unable to detect defects in the bonding strength of the coating interface at fixed points

Images