MARCUS PAULO RAELE

Resumo

Degree in Physics from the University of São Paulo (USP). The subjects of study in both the Masters and in PhD, performed at USP, were related to the development of systems of Optical Coherence Tomography. Currently part of the research staff of IPEN, the Center for Lasers and Applications developing applications of lasers in nuclear science. (Text obtained from the Currículo Lattes on November 16th 2021)


Graduado em Física pela Universidade de São Paulo (USP). Os temas de estudo tanto no mestrado quanto no doutorado, também realizados na USP, foram relacionados ao desenvolvimento de sistemas de Tomografia por Coerência Óptica. Atualmente faz parte do quadro de pesquisadores do IPEN, no Centro de Lasers e Aplicações desenvolvendo aplicações de lasers em ciências nucleares e radiativas, sendo elas focadas no processamento de materiais através da ablação à laser. (Texto extraído do Currículo Lattes em 16 nov. 2021)

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  • Artigo IPEN-doc 23101
    Soldering mask laser removal from printed circuit boards aiming copper recycling
    2017 - RAELE, MARCUS P.; PRETTO, LUCAS R. de; ZEZELL, DENISE M.
    Management of waste of electric and electronic equipment (WEEE) is a key issue for modern societies; furthermore, it contains valuable materials that can be recycled, especially in printed circuit boards (PCB), which have approximately one-third of their weight in copper. In this study we demonstrated the use of laser to strip the covering soldering mask on PCB’s, thus exposing the copper underneath so that extraction techniques may take place. Using a Q-Switched Nd:YAG laser operating at 1064 nm and 532 nm we tested the procedure under different energy conditions. The laser stripping of the soldering mask was achieved with satisfactory results by irradiation with 225 mJ at 1064 nm. However, when using similar parameters at 532 nm the process of the coating ejection was not promoted properly, leading to a faulty detachment. Infrared laser PCB stripping presents itself to be technically viable and environmental friendly, since it uses no chemicals inputs, offering one more option to WEEE treatment and recycling.