A feasibility study on process monitoring and control in vat photopolymerization of ceramics

Abstract

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Effects of the Layer Height and Exposure Energy on the Lateral Resolution of Zirconia Parts Printed by Lithography-Based Additive Manufacturing

“…The shaping process was conducted with a customized CeraFab 7500 printer by Lithoz GmbH in Vienna, Austria, and has been described in several publications [1,6,[10][11][12]18,[24][25][26]. The customization concerns the device's ability for VIS and UV polymerization.…”

“…This phenomenon is irrelevant if the neighboring pixels are irradiated as well. In the case of the part edges, exceeding of the pixel boundaries causes an inaccuracy of the generated specimen compared to the CAD (computer aided design) [12]. This problem is often referred to as cross-talk effect [11] and shows in so-called over-polymerization of a printed part.…”

Perspective Chapter: Additive Manufactured Zirconia-Based Bio-Ceramics for Biomedical Applications

“…Therefore, photoinitiators are added to generate reactive species that can trigger the monomers and oligomers. When polymerization is initiated, the reaction proceeds through a chain reaction of double bonds and forms a three-dimensional crosslinked bond together with reactive monomers and oligomers [64,65]. Free radical photoinitiators added to certain monomers, such as acrylates and methacrylates, absorb UV light to generate free radicals and incite a double bond reaction of the monomers [66].…”

Development of a 3D model to predict curing dimensions and conversion rates of curable ceramic systems during stereolithography 3D printing process

“…Where is the pulse power (or peak power), W0 the laser beam radius at 0. is the penetration depth coefficient that denotes the laser attenuation due to light absorption during the propagation and corresponds to the depth where the intensity of the Gaussian laser beam is reduced by 1/e [14]. It is defined thanks to the Beer-Lambert law using the following relation [19,20] where ε and c are respectively the molar extinction coefficient and the concentration of absorbing species, assumed constant:…”