A Study on the Rheological and Mechanical Properties of Photo-Curable Ceramic/Polymer Composites with Different Silane Coupling Agents for SLA 3D Printing Technology

Abstract

Silane coupling agents (SCAs) with different organofunctional groups were coated on the surfaces of Al2O3 ceramic particles through hydrolysis and condensation reactions, and the SCA-coated Al2O3 ceramic particles were dispersed in a commercial photopolymer based on interpenetrating networks (IPNs). The organofunctional groups that have high radical reactivity and are more effective in UV curing systems are usually functional groups based on acryl, such as acryloxy groups, methacrloxy groups, and acrylamide groups, and these silane coupling agents seem to improve interfacial adhesion and dispersion stability. The coating morphology and the coating thickness distribution of SCA-coated Al2O3 ceramic particles according to the different organofunctional groups were observed by FE-TEM. The initial dispersibility and dispersion stability of the SCA-coated Al2O3/High-temp composite solutions were investigated by relaxation NMR and Turbiscan. The rheological properties of the composite solutions were investigated by viscoelastic analysis and the mechanical properties of 3D-printed objects were observed with a nanoindenter.

Recent Progress in Additive Manufacturing of Fiber Reinforced Polymer Composite

“…Rheology plays an important role during the coating of the new layer in SLA methodology. Typical range of viscosity is between 0.1 and 100 Pa s,[62b,143a,145] although viscosity as high as 500 Pa s has also been successfully coated. For bottom‐up SLA technique, the viscosity should not be higher than 0.5 Pa s, as resin would not have sufficient time to fill in the new layer gap, thus causing fabrication failure.…”

Sintering Process Optimization for 3YSZ Ceramic 3D-Printed Objects Manufactured by Stereolithography

“…In this regard, for the sintering stability of ZrO 2 , 3YSZ nanoparticles with 3 mol% yttria added as a stabilizer were used in this study. Dispersion stability and supportless 3D printing technology for high-viscosity ceramic nanocomposite resins with high ceramic content were optimized in our previous work [ 13 , 14 ]. By controlling the amount of non-reactive diluents, the viscosity and flowability of UV-curable 3YSZ ceramic nanocomposite resins were optimized for the supportless SLA 3D printing process.…”

Enhanced Mechanical and Thermal Properties of Stereolithography 3D Printed Structures by the Effects of Incorporated Controllably Annealed Anatase TiO2 Nanoparticles

“…Conversely, fast curing and worthy spatial resolution benefit this technique, but fragility and poor bearing resistance leads to the serious drawbacks caused by non-uniform polymerization and poor cross-linking density, limiting the application of SLA printing [21,22]. Conversely, oxygen inhibition during free radical formation in the polymerization process has been a highly challenging phenomenon within photopolymerization techniques.…”