| dc.description.abstract | Vat photopolymerization is one of additive manufacturing and also known as
photo-curable three-dimensional printing technology. It uses light energy with the proper wavelength
to expose on the liquid photo-curable resin inducing the photopolymerization process and resulting in
solidification layer-by-layer. The building method is classified into two ways: free-surface and
constrained-surface. The advantage and disadvantage of both methods are described and analysed
according to the different material property and requirement. The basic composition for
photo-curable resin consists of photo-initiator and monomer. Adding powder into photo-curable resin
makes the photo-curable slurry. Literatures report that high density powder such as zirconia oxide or
Inconel 718 is suitable for free-surface building method because of poor suspension. However, the
volume percentage in the slurry is less than 50% causing the higher shrinkage ratio and inaccuracy
after sintering process. The coupling agent may increase the suspension of powder in slurry but
experimental result shows that it still cannot improve the success rate in the constrained-surface
building method. Therefore, this study proposes a combination method to overcome the difficulty of
making high density ceramic or metal part. In addition, the sintering process is a key factor to obtain
the high dense part with no crack occurrence and desirable microstructure. The optimized sintering
parameters for zirconia oxide and Inconel 718 are also introduced. | en_US |
