Bullet shock testing method of coating layer-substrate interface binding performance

Abstract

The invention discloses a pellet impact testing method for coating-matrix interface combination properties, comprising the steps: preparing a sample coated with coating to be tested with an included angle formed between a sample interface and a free surface of a matrix; preparing pellets with assistant coating on the front-end surface, the matrix of which is made of material with lower acoustic impedance; projecting the pellet with a projector, so as to make the pellet vertically impact the free surface of the sample with the end with coating; measuring the initial velocity when the pellet contacts with the sample, and according to the known numerical calculation and theoretical analysis, solving stress history of coating-matrix interface; measuring disbonded characteristic dimension of the coating-matrix interface on the sample, establishing the relation between the stress history of coating-matrix interface and the disbonded characteristic dimension of the coating-matrix interface, so as to evaluate the combination properties of the coating-matrix interface. The invention, having simple principle, clear model, strong operability, can test strong combination coating-matrix interface combination properties and dynamic coating-matrix interface combination properties with different loading proportions.

Description

technical field [0001] The invention relates to a method for measuring the interface bonding performance between a substrate and a coating layer. Background technique [0002] The primary problem of coating technology usually exists in the combination of the coating and the substrate, and the laboratory characterization of the actual bonding strength of the interface between the coating and the substrate is to peel off the coating by designing the loading method, and establish the peeling behavior and load of the coating. Relationship. [0003] Due to the cross-scale structural characteristics of the coating and the substrate system, how to effectively apply a load on the interface between the coating and the substrate to peel off the coating has always been a difficulty and hot spot in the experimental design. Generally speaking, the common loading methods in the early stage are all quasi-static, and can be roughly classified into three categories. The first category is th...

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Problems solved by technology

However, the load level provided by this method is low, and the interface bonding performance between the strongly bonded coating and the substrate cannot be evaluated (from this point of view, the adhesive method can even reach a higher stress level); at the same time, the method It is necessary to make the substrate into a slender rod, and then apply the coating on the end of the rod, which requires too much sample production; and this method is only suitable for thicker coatings

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