Development of Adhesion Durability Evaluation of Surface Coatings Using Repeated Laser Shock-wave Adhesion Test
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Development of Adhesion Durability Evaluation of Surface Coatings Using Repeated Laser Shock-wave Adhesion Test Kohei Kanamori1 · Yusaku Saito1 · Takeshi Yamada1 · Akio Yonezu1,2
· Xi Chen2,3
Received: 28 March 2019 / Accepted: 9 November 2020 / Published online: 18 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This study aims to evaluate coating adhesion durability using the laser shock-wave adhesion test (LaSAT). In particular, the interfacial strength with respect to the applied loading cycle is evaluated quantitatively. This method uses strong elastic waves induced by pulsed laser irradiation, as interfacial fracture of the coating occurs due to a strong wave. The coating delamination can be identified from changes in the out-of-plane displacement waveform, yielding a critical laser energy for coating delamination. Subsequently, computation of elastic wave propagation using the finite difference time domain (FDTD) method was carried out to estimate the tensile stress developed at the coating/substrate interface, yielding the interfacial strength. In addition, the durability of interfacial adhesion was investigated by repeated LaSATs. Repetitive lower stress loading was applied to the interface using repeated laser irradiations. It was found that repetitive loading encourages interfacial fracture, which has a stress level lower than that of single (monotonic) laser irradiation. For various levels of irradiation laser energy, the interfacial adhesion durability was investigated. This result may be useful for evaluating adhesion durability when a coating/film is used under cyclic loading over a long-time duration. Keywords Laser shock-wave adhesion test (LaSAT) · Repeated pulsed laser irradiation · Adhesion durability · Delamination detection · Coatings
1 Introduction Surface coatings are widely used for engineering materials in order to improve upon or add various features such as friction resistance, surface strength, anti-corrosion, and conductivity. As an example, Cu plating possesses high electrical conductivity, and the plating may be useful for various electric devices. However, mechanical loading resulting from differences in thermal expansion coefficients may induce delamination or exfoliation of the plating. During a devices’
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Akio Yonezu [email protected] Xi Chen [email protected]
1
Department of Precision Mechanics, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo 112-8551, Japan
2
Center for Advanced Materials for Energy and Environment, Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA
3
School of Chemical Engineering, Northwest University, Xi’an 710069, China
design life, repeated loading may be applied to the interface, enhancing delamination of the plating and coating. Therefore, evaluation of adhesion strength, especially adhesion durability (with respect to cyclic loading), is important for plating and surface coating materials. It has been found that when cyclic loading is applied
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