abstract
In this work an eco-friendly methodology to manufacture lithium disilicate complex parts using a water-based photocurable suspension is proposed. The particles surface was modified with polyethyleneimine to improve it rheological and chemical stability in water media. The surface functionalization of powders allows the formulation of high solid content slurries with relatively small (17-20 vol%) amounts of poly(ethylene glycol) diacrylate (PEGDA) as reactive monomer and Lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP) as photoinitiator. The printing parameters for Vat-photopolymerization were determined based on photorheological measurements. Simple geometrical shapes were successfully printed with suspensions containing 42-45 vol% of solids for structural and mechanical characterization. Due to the aqueous-based media, a fast debinding cycle was employed (ti 10 h), resulting in sintered samples with ti 98 % of relative density and a flexural strength of ti280 MPa. The optimized photocurable suspension and printing parameters were then selected to print different kind of dental prostheses as a proof-of concept.
keywords
PARTICLE-SIZE DISTRIBUTION; DEBINDING PROCESS; STEREOLITHOGRAPHY; DENSITY; CRYSTALLIZATION; FABRICATION; STRENGTH; PACKING; SURFACE
subject category
Materials Science
authors
Alves, MFRP; Ferrandez-Montero, A; Ferrari, B; Fernandes, MHFV; Olhero, SM; Sanchez-Herencia, AJ
our authors
Manuel Fellipe Rodrigues Pais Alves
Researcher
Maria Helena Figueira Vaz Fernandes
Retired Professor
Susana Maria Henriques Olhero
Assistant ProfessorProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
The authors are grateful to the JECS Trust for funding this work between the Department of Materials and Ceramic Engineering, University of Aveiro (Portugal) , and the Institute of Ceramic and Glass (ICV-CSIC) (Spain) (Contract No. 2022331) . M.F.R.P. Alves acknowledges the FCT for the PhD grant (2021.06615.BD) . This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , financed by national funds through the FCT/MCTES (PIDDAC) . The project PID2022-137274NB-C31 funded by MCIN/AEI/10.13039/501100011033 and the European Union are also acknowledged.