Debinding; Polyacrylates; Resin formulation; Stereolithography; Thermal degradation; Tricalcium phosphate; Electronic, Optical and Magnetic Materials; Ceramics and Composites; Biomaterials; Materials Chemistry
Abstract :
[en] With the median age of the population steadily rising, the rate of bone disorders increases as well, making the need of bone implants more and more urgent in our society. However, manufacturing of synthetic bioimplants requires high flexibility of the process and materials with sufficient mechanical strength and biocompatible properties. This paper is devoted to the printing of β-tricalcium phosphate (β-TCP) by stereolithography. The suspensions or pastes containing the photosensitive-resin mixed with β-TCP powder were assessed for the following parameters: rheological behaviour, thermal degradation of photo-cured samples, quality of green and sintered parts. It appeared that the composition of the photo-sensitive resin influences the viscosity of the paste. However, no direct correlation could be drawn between the viscosity of the photo-sensitive resins and the viscosity of the whole paste. A hypothesis is that the chemical structure of the monomers composing the photo-sensitive resin also impacts the viscosity of the paste. A thermal debinding cycle was built from the thermogravimetric analysis of the photo-cured samples. The structure of the post printed (green) parts and final parts (parts after debinding and sintering) was evaluated. It appeared that the pastes with the lowest viscosity were the easiest to process, and that the green parts made with these pastes were the easiest to clean, reducing the number of defects in the sintered parts. Process optimisation was also assessed. Different light parameters were evaluated, and it appeared that reducing the light power during the printing improved the resolution as well as the quality of the sintered parts.
Disciplines :
Chemistry
Author, co-author :
Goutagny, Chloé; Belgian Ceramic Research Center (BCRC), Mons, Belgium
Hocquet, Stéphane; Belgian Ceramic Research Center (BCRC), Mons, Belgium
Hautcoeur, Dominique; Belgian Ceramic Research Center (BCRC), Mons, Belgium
Lasgorceix, Marie; Univ. Polytechnique Hauts-de-France, EA 2443 - LMCPA - Laboratoire des Matériaux Céramiques et Procédés Associés, Valenciennes, France
Somers, Nicolas ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM) ; Univ. Polytechnique Hauts-de-France, EA 2443 - LMCPA - Laboratoire des Matériaux Céramiques et Procédés Associés, Valenciennes, France
Leriche, Anne; Univ. Polytechnique Hauts-de-France, EA 2443 - LMCPA - Laboratoire des Matériaux Céramiques et Procédés Associés, Valenciennes, France
Language :
English
Title :
Development of calcium phosphate suspensions suitable for the stereolithography process
The author is grateful to the “Doc 3D printing” project for financial support. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 764935.
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