Eventos Anais de eventos
COBEF 2021
11th Brazilian Congress on Manufacturing Engineering
DLP ADDITIVE MANUFACTURING OF CERAMICS: PHOTOSENSITIVE PARAMETERS, THERMAL ANALYSIS, POST-PROCESSING, AND PARTS CHARACTERIZATION
Submission Author:
Italo Leite de Camargo , SP
Co-Authors:
Italo Leite de Camargo, Rogério Erbereli, João Fiore Parreira Lovo, Carlos Fortulan
Presenter: Italo Leite de Camargo
doi://10.26678/ABCM.COBEF2021.COB21-0106
Abstract
Digital light processing (DLP) is an additive manufacturing (AM) process that can produce high-performance ceramic parts with tiny structures, high dimensional precision, and outstanding surface quality. Curing the suspension to form the layers and the post-processing are important aspects to generate parts with good geometrical accuracy and mechanical properties. In this work, the photosensitive parameters and the thermal decomposition of a recently developed photosensitive ceramic suspension were investigated, creating a foundation for the manufacture of zirconia parts. It was found that the absorbance of the photoinitiator BAPO fits the exposure irradiance of a standard mercury vapor lamp from a commercial projector. Finally, ceramic test specimens were manufactured in a custom-built DLP 3Dprinter, debound, and sintered at different temperatures (1400, 1500, and 1600 °C) for 2 hours to compare shrinkage, relative density, and flexural strength. For all temperatures, the shrinkage in the Z direction was found to be higher than in the XY plane. Parts sintered above 1500 °C presented a relative density greater than 95%. There is a tendency of increasing flexural strength with increasing temperature in the studied range and some parts sintered at 1600 degrees exceeded 200 MPa. However, a few specimens failed at the layers interface, causing a great variation in the flexural strength obtained.
Keywords
digital light processing, Additive manufacturing, Ceramics, 3D printing, vat photopolymerization
DOWNLOAD PDF VIEW PRESENTATION
