Publication: 3D printing of high solid loading zirconia feedstock via screw-based material extrusion
Date
2023
Authors
Lim I.Y.
Ting C.H.
Ng C.K.
Tey J.Y.
Yeo W.H.
S R.
Lee K.Y.S.
Chuah Y.D.
Teng W.D.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
Zirconia ceramic (3Y-TZP) feedstocks with solid loadings from 50 vol% to 68 vol%, in a 60:40 paraffin wax to LDPE ratio binder system, were prepared and printed using a screw-based material extrusion printer. A two-step debinding process involving solvent debinding (cyclohexane + ethanol) and thermal debinding (140 �C�600 �C at 0.2 �C/min) followed by sintering at 1500 �C for 2 h was employed. Tests performed include TGA, density test, Vickers hardness and fracture toughness, XRD, and SEM. The TGA result showed two significant drops in weight starting at 180 �C and 380 �C, which corresponds to the decomposition of paraffin wax and LDPE, respectively. A minimum of 40 wt% of soluble binder was removed from the green sample after solvent immersion for 3 h at 40 �C for solid loadings ?55 vol%. High solid loading feedstocks produced samples with comparable density, Vickers hardness and fracture toughness, which are 97.5%, ?12.3 GPa, and ?5.5 MPa m1/2, respectively
while XRD and SEM shows no adverse tetragonal to monoclinic phase transformation and grain growth, respectively. This study demonstrates that 3D printing of granular 3Y-TZP ceramic feedstock via screw-based material extrusion technique is feasible even with high solid loadings, which is usually difficult to fabricate into flexible filaments and print due to high viscosity. � 2023 Elsevier Ltd and Techna Group S.r.l.
while XRD and SEM shows no adverse tetragonal to monoclinic phase transformation and grain growth, respectively. This study demonstrates that 3D printing of granular 3Y-TZP ceramic feedstock via screw-based material extrusion technique is feasible even with high solid loadings, which is usually difficult to fabricate into flexible filaments and print due to high viscosity. � 2023 Elsevier Ltd and Techna Group S.r.l.
Description
Keywords
Additive manufacturing , Debinding defects , Mechanical properties , ZrO<sub>2</sub> feedstock , 3D printing , Ductile fracture , Extrusion , Fracture toughness , Grain growth , Organic solvents , Paraffins , Screws , Sintering , Vickers hardness , X ray diffraction , Zirconia , 3-D printing , 3D-printing , Debinding , Debinding defect , High solid loading , Solid loading , Vicker hardness , XRD , Zirconia ceramic , ZrO2 feedstock , Feedstocks