Experimental and theoretical study of local curing on thermosetting resins using a CO2 laser

Marco A. F. Scarparo; Andre L. J. Munhoz; Paulo R. S. Wagner; Maria Clara F. Ieradi; Alvin E. Kiel; Susan Davis Allen

doi:10.1117/12.307119

30 April 1998 Experimental and theoretical study of local curing on thermosetting resins using a CO₂ laser

Marco A. F. Scarparo, Andre L. J. Munhoz, Paulo R. S. Wagner, Maria Clara F. Ieradi, Alvin E. Kiel, Susan Davis Allen

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307119
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

We present a theoretical and experimental study of thermosetting resins used in thermal stereolithography. In usual practice, stereolithography makes use of photosensitive resins where HeCd (0.352 micrometers ) laser ultraviolet laser initiates the curing process. In this work we study the process of local curing through the application of infrared radiation, which has proved to be useful in a new technique for the making of prototypes by means of selective heating with a CO₂ laser (10.6 micrometers ). The sample consists of a thermosetting resins (epoxy) with the curing agent (diethylene triamine) and a filler (silica). The ideal composition of the thermosetting resins has proved to be 10 parts epoxy, 1.4 part diethylene triamine (the curing agent) and 0.7 part silica powder. A physical theoretical model is applied for control of the parameters which influence the confinement of the curing in the irradiated bulk. A mathematical model was developed through the solution of the time dependent heat conduction equation in cylindrical co-ordinates, which enables the determination fo the behavior of curing in terms of irradiation conditions. An experimental analysis has determined the temperature range at which the curing process starts and the optimum silica concentration for efficient curing.

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Marco A. F. Scarparo, Andre L. J. Munhoz, Paulo R. S. Wagner, Maria Clara F. Ieradi, Alvin E. Kiel, and Susan Davis Allen "Experimental and theoretical study of local curing on thermosetting resins using a CO₂ laser", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307119

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