Bullet impact method for testing coating/ thin film basal body interface bond strength
A technology of interfacial bonding strength and impact method, which is applied in the field of coating/film, can solve the problems of inability to evaluate the interface bonding performance of strongly bonded coating/film-substrate, high production requirements, low load level, etc., to achieve clear models and reliable The effect of strong operability and simple principle
Inactive Publication Date: 2008-08-06
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology
However, the load level provided by this method is low, and the bonding performance of the strongly bonded coating / film-substrate interface cannot be evaluated (from this point of view, the adhesive method can even reach higher stress levels); at the same time, the method The substrate needs to be made into a slender rod, and then the coating / film is applied on the rod end, which is too demanding for sample preparation; and this method is only suitable for thicker coatings
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Embodiment 1
[0023] Referring to Fig. 1 and Fig. 2, the projectile impact method based on spalling effect that the inventor proposes, basic principle is to use the lower material (as plastics) of acoustic impedance as cylindrical projectile 1, by cylindrical projectile matrix 11 and plating The shot coating 12 on the front face of the shot base 11 is composed, and the acoustic impedance of the shot coating 12 is close to that of the sample base 21 .
[0024]
[0025] The sample 2 is fixed on the bracket, and the projectile 1 is launched by a projectile launching device, such as an air gun, a ballistic gun or a gas cannon, so that the projectile 1 moves at a certain speed V along the vertical direction of the sample. 0 The surface of the substrate 21 of the flat sample 2 is impacted, and a compressive stress wave is generated. The stress wave propagates from the impacted part on the substrate to the outer free surface 221 of the coating / film and is reflected, and the reflected wave and th...
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The invention discloses a bullet impact method for measuring coating / film-basal body interface bonding strength, which comprises the following steps of preparing a flat plate sampling covered by the coating to be measured; preparing a bullet with coating, wherein the basal body of the bullet being made of material with lower acoustic impedance; firing out the bullet with a launching device to enable the bullet to impact the basal body surface of the sample with the coating part of the bullet being perpendicular to the basal body surface; measuring the initial speed of the bullet when touching the sample, and obtaining the sample coating / film-basal body interface stress history according to the known numerical calculation and theoretical analysis; measuring the coating / film-basal body interface stripping characteristic size of the sample, and establishing the relationship between the coating / film-basal body interface stress history and the coating / film-basal body interface stripping characteristic size to evaluate the coating / film-basal body interface bonding performance. The invention which has a simple principle and a clear model is capable of measuring the coating / film-basal body interface bonding performance of a tight bonding coating and the coating / film-basal body interface dynamic performance with high operationability.
Description
technical field [0001] The invention relates to the technical field of coating / film, in particular to a projectile impact method for measuring the bonding strength of the coating / film-matrix interface. Background technique [0002] The primary problem of coating / film technology usually exists in the combination of coating / film and substrate, and the laboratory characterization of the actual bonding strength of the coating / film-substrate interface is to peel off the coating / film by designing the loading method and establish the coating. Layer / film peel behavior as a function of load. [0003] Due to the cross-scale structural characteristics of the coating / film-substrate system, how to effectively apply loads on the coating / film-substrate interface to peel off the coating / film has always been a difficulty and hot spot in experimental design. Generally speaking, the more common loading methods in the early stage are quasi-static, and can be roughly classified into three categ...
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IPC IPC(8): G01N19/04
Inventor 吴臣武陈光南张坤罗耕星卢哲猛廖孟豪杨班权
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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