Abstract
Alumina green bodies shaped with digital light processing (DLP) technology were debinded in four atmospheres, including air, argon (Ar), mixture of 95% argon and 5% hydrogen (95% Ar +5% H2) and vacuum, at different heating rates (0.5 °C/min, 1 °C/min and 3 °C/min), followed by sintering in air at 1650 °C for 3 h. The effects of debinding atmosphere and heating rate on microstructure and densification of the brown bodies and sintered bodies were evaluated via morphology characterization, X-ray computed tomography (CT) reconstructions and other tests. Focusing on the quantitative analysis of the geometric characteristics and distribution of defects in the brown bodies and sintered bodies, it is found that the type (holes, cracks and delamination), content and volume distribution of defects during the debinding in aerobic and anaerobic environments are different. Our study indicates that low-rate vacuum debinding should be adopted as a promising debinding approach for ceramics shaped with photopolymerization-based additive manufacturing technology.
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