Hot ceramic lithography of silica-based ceramic cores: The effect of process temperature on vat-photopolymierisation

A Systematic Study on Impact of Binder Formulation on Green Body Strength of Vat-Photopolymerisation 3D Printed Silica Ceramics Used in Investment Casting

“…Moreover, the flexural strain observed at the breaking point increased exponentially with the addition of oligomer due to the increasing presence of strong intermolecular forces (here, Hydrogen bonds), which helps in the stretchability observed in the above binder mixtures. The energy released during the breakage of hydrogen bonds when the medium is subjected to mechanical loading can be the reason behind the increasing strain [ 17 , 20 ].…”

“…A silica-based ceramic powder mix (with a d 50 particle size of 5 µm) and an active polymeric dispersant were infused with all formulated binder mixtures to test their impact on the rheological behaviour of suspensions and mechanical properties of printed parts. A complete study of the properties and sources of the powder mixture and commercial dispersant is published elsewhere [ 20 ].…”

“…The mechanical properties of ceramic green bodies can be further improved by mixing HDDA with (meth)acrylate monomers from various functional groups [ 13 , 14 , 15 , 16 , 17 , 18 ], and the overall viscosity of the medium can be reduced by reactive diluents such as N-Vinylpyrrolidone (NVP) [ 4 ], or acryloyl morpholine (ACMO) [ 19 ]. Although print quality and accuracy significantly depend on the viscosity degree of mixtures, the green body strength is another vital factor due to the high peeling forces, such as printing parts in the vertical direction with a viscosity of up to 10,000 mPa·s [ 20 ]. The parts made by most AM technologies are strong in X- and Y- axes and weak in the Z-axis due to the weak bond formation between layers [ 21 , 22 ].…”

Binder stabilization and rheology optimization for vat-photopolymerization 3D printing of silica-based ceramic mixtures

“…A complete study of the properties and sources of these selected monomers is published elsewhere [8], summarised in Supplementary Table 1. The compositions of the selected binder mixtures used in this study were based on the results in [8]- [10], and the contents of the four developed binder mixtures are demonstrated in Table 1. Two commercially available silica-based powder mixtures (purity ≥ 99.97%) used in conventional ceramic injection for the core manufacturing applications, TC01 and TC06, were provided from Turbine Casting SAS (Le Creusot, France).…”

“…The incorporated amount of photo and co-initiator is 0.5 wt.% of the binder systems. A carbon black pigment stock was added in 2 wt.% of the binder formulations to control the light penetration [10]. The complete dissolution of all elements was ensured by sonicating the mixtures in the ultrasonic bath at 50 °C for 1 h. All formulated ceramic suspensions were mixed using a dual asymmetric centrifuge mixer (SpeedMixer DAC 150 FVZ, Hauschild, Hamn, Germany) for sufficient dispersion.…”