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Direct ink writing of 3Y-TZP ceramics using PEG-Laponite® as additive.
- Source :
-
Ceramics International . Aug2023, Vol. 49 Issue 16, p26348-26358. 11p. - Publication Year :
- 2023
-
Abstract
- This study investigated a new colloidal ink, containing Laponite® nanoclay as additive, to develop ZrO 2 -based ceramic prototypes by Direct Ink Writing (DIW). The ink developed contained 31 vol% 3Y-TZP as solid load and 69% v/v of gel containing 7.5% (w/w) Laponite®, polyethylene glycol (PEG), and dibutyl phthalate. The rheologyical behavior of this ceramic ink was analyzed and its extrudability was optimized. The samples were DIW 3D-printed at a speed of 10 mm/s with nozzle diameter of 0.41 mm. After drying for 24 h, the zirconia samples underwent debinding and were pre-sintered at 1100 °C under a heating rate of 1 °C/min. After pre-sintering, the samples were sintered at 1550 °C for 2 h. Subsequently, the sintered samples were characterized by Scanning Electron Microscopy and X-ray diffractometry. Fracture toughness was measured by Vickers indentation, whereas nano-hardness and Young's modulus were assessed by dynamic Vickers nanoindentation (250–1960 mN loads). A relative density of 89.3 ± 0.5% was found. The following crystalline phases were observed: monoclinic-ZrO 2 (34%), tetragonal-ZrO 2 (31%), and cubic-ZrO 2 (35%). This behavior is probably due to the segregation of Y+3 between the zirconia grains, favored by the presence of Laponite® nanoclay during the sintering process. The microstructure of the prototypes showed two distinct populations of ZrO 2 grains with average particle sizes of 1 μm (monoclinic and tetragonal phases) and >5 μm (cubic phase). Vickers hardness (HV 1000gF) was 952 ± 40 HV and fracture toughness was 4.6 ± 1.1 MPa m1/2. A Young's modulus of ∼200 GPa and hardness values of 1837.9 and 1943.3 HV were found for loads of 250 and 1960 mN, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 49
- Issue :
- 16
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 164459559
- Full Text :
- https://doi.org/10.1016/j.ceramint.2023.05.170