Interface bonding strength testing device for polymer coating material

Abstract

The invention discloses an interface bonding strength testing device for a polymer coating material. The device comprises a substrate, wherein a fixed base is mounted on the end surface of the substrate; a substrate fixed plug pin hole is formed in the fixed base from bottom to top; a Brazilian disc test piece guide rail and a stretch plate guide rail are transversely arranged in the substrate from top to bottom; one end, away from the fixed base, of each of the Brazilian disc test piece guide rail and the stretch plate guide rail is of open type design, and an observation window is formed inthe substrate and located above the Brazilian disc test piece guide rail. By means of design of the device, a test piece can be effectively prevented from twisting in a stretching process, accuracy ofa measurement result is guaranteed, besides, the defocus phenomenon during microscopephotographing in a loading process can be prevented by means of the Brazilian disc test piece guide rail, and thedevice can also prevent interface blocking during image shooting of a microscope in an variable-angle experiment, and provides guarantee for richness of the experiment.

Description

technical field [0001] The invention belongs to the technical field of experimental mechanical testing devices, and in particular relates to a testing device for interfacial bonding strength of polymer coating materials. Background technique [0002] During the service process of coating materials, the bonding performance between the film and the substrate directly affects the service time of the film, and the anti-corrosion, wear-resistant and anti-oxidation properties of the film will also be affected by the bonding strength. Therefore, the film / The determination of the interfacial bonding strength of the base system is an important part of evaluating the quality of the film. Common methods for determining binding strength can be divided into two categories: loading method and energy method. [0003] Hard coatings such as thermal barrier coatings can be tested using the energy method. The energy method is mainly to obtain the fracture energy when the film is debonded to ...

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Problems solved by technology

[0006] However, there are certain problems with this method. When using a stretching machine to directly stretch the specimen, the specimen may rotate, twist and move out of the plane during the stretching process, which will cause virtual focus of the microscope lens and affect the Second, when measuring at the micro scale, due to the larger pull head of the stretching machine and the smaller size of the specimen, the pull head of the stretching machine may block the interface of the specimen when measuring at a variable angle. phenomenon, so we propose a testing device for interfacial bonding strength of polymer coating materials

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