Thermal behaviour of electric connector coating irradiated by a laser beam
In this work, one dimension unsteady heat problem is resolved to simulate laser treatment of an electric connector coating. The electrochemical gold coating processing is not sufficient to limit the corrosion inside the connector. Thus an excimer laser beam interacts with the surface to recover a regular smooth surface by melting. The laser fluence must be adjusted to ensure the partial melting of the gold coating without its evaporation. The modelling of heat diffusion allows calculating the optimal fluence range (laser energy). Typically, for 0.75?m surface coating on a multilayer metallic substrate, the laser fluence is ranging from 390 to 550mJ/cm2. The temperature profile is also plotted to describe the coating thermal field. Finally, the effect of the heat density (laser intensity) time distribution in the temperature profile and the melting depth is discussed.
electric connector laser treatment corrosion melting depth one dimension thermal modelling