Hot spray coating artificial unsticking defect specimen and prefabricating method thereof

Abstract

The invention relates to the technical field of preparation of unsticking defects, in particular to a hot spray coating artificial unsticking defect specimen and a prefabricating method thereof. The prefabricating method of the hot spray coating artificial unsticking defect specimen, provided by the invention, comprises the following steps: machining a through hole with the desired diameter in a base body, and arranging an internal thread on the inner wall of the through hole; preparing a filling bar, and arranging an external thread on the outer surface of the filling bar, wherein the length of the filling bar is not smaller than the depth of the through hole; screwing the filling bar into the through hole, and enabling the end surface of the screwing-in end of the filling bar is flush with the outer surface of the base body so as to form an intact plane, wherein the matching difficulty of the through hole and the filling bar is greatly reduced, the matching tightness is good, the machining cost is low, and the depth of an artificial simulating defect can be arbitrarily adjusted; performing sand blasting and spray coating on the surface of the plane, and finally screwing out the filling bar from the screwing-out end so as to obtain an artificial unsticking defect, wherein the heat conducting rule of the artificial unsticking defect is enabled to be closer to that of a real unsticking defect.

Description

technical field [0001] The invention relates to the technical field of debonding defect preparation, in particular to a thermal spray coating artificial debonding defect test piece and a prefabrication method thereof. Background technique [0002] Thermal spray coatings are widely used on the surface of engineering structures and mechanical parts to perform anti-corrosion, wear-resistant, heat insulation and other functions. During the service process, the coating is subjected to external loads, corrosive environments, thermal fatigue, etc., which will cause debonding at the coating-substrate interface. If the debonding area develops and expands, the coating will fall off. In the process of engineering testing and scientific research, it is very difficult to prepare real standard samples of debonding defects, because the size and shape of the debonding area cannot be controlled. [0003] Therefore, at present, artificial debonding defects are used to simulate real debonding...

AI Technical Summary

Problems solved by technology

[0008] The first object of the present invention is: provide a kind of prefabrication method of artificial debonding defect test piece of thermal spraying coating that has simple structure, low production cost and can effectively improve test piece preparation efficiency and test result reliability, to solve existing The prefabrication method has complex structure, high production cost and difficulty in controlling the degree of close fit between the rod and the blind hole, which leads to the problem that the heat conduction law of the debonding defect cannot be truly reflected

[0009] The second object of the present invention is: provide a kind of thermal spraying coating artificial debonding defect specimen with simple structure, low production cost and can effectively improve specimen preparation efficiency and test result reliability, to solve existing specimen The structure is complex, the production cost is high, and it is difficult to control the close fit between the rod and the blind hole, which leads to the problem that the heat conduction law of the debonding defect cannot be truly reflected

Images