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Proceedings Paper

Experimental and theoretical study of local curing on thermosetting resins using a CO2 laser
Author(s): Marco A. F. Scarparo; Andre L. J. Munhoz; Paulo R. S. Wagner; Maria Clara F. Ieradi; Alvin E. Kiel; Susan Davis Allen
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Paper 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.

Paper Details

Date Published: 30 April 1998
PDF: 10 pages
Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); doi: 10.1117/12.307119
Show Author Affiliations
Marco A. F. Scarparo, Univ. Estadual de Campinas (Brazil)
Andre L. J. Munhoz, Univ. Estadual de Campinas (Brazil)
Paulo R. S. Wagner, Univ. Estadual de Campinas (Brazil)
Maria Clara F. Ieradi, Univ. Estadual de Campinas (Brazil)
Alvin E. Kiel, Univ. Estadual de Campinas (Brazil)
Susan Davis Allen, Florida State Univ. (United States)

Published in SPIE Proceedings Vol. 3272:
Laser Techniques for Surface Science III
Hai-Lung Dai; Hans-Joachim Freund, Editor(s)

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