Coating optimization of yield pseudoplastic paste-based stereolithography 3D printing of alumina ceramic core |
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Affiliation: | 1. School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan, 250101, PR China;2. Research Center of 3D Printing in Stomatology of Shandong University, PR China;3. Department of Oraland Maxillofacial Surgery,The Second Hospital, Cheeloo College of Medicine, ShandongUniversity, Jinan, 250012, PR China |
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Abstract: | Yield pseudoplastic paste is prepared for self-supported stereolithography (SLA) 3D printing with critical shear stress of 290.7 Pa and viscosity of 28810 mPa·s under strain rate of 30 s?1. Simulation analysis of paste coating is carried out based on established constitutive equation. Furthermore, corresponding stress field is analyzed under different layer thicknesses (25–100 μm) and blade speeds (1.5–4.5 mm/s). Then, flexural strength, porosity, surface roughness and microstructure of components, printed with different layer thicknesses and sintered at different temperatures, are systematically investigated. Finally, complex-shaped cores are fabricated with flexural strength of 38.56±1.45 MPa, porosity of 21.57±0.8% and surface roughness of Ra < 3 μm. The optimized parameters include layer thickness of 25–50 μm, blade speed of 3.5 mm/s, and sintering temperature of 1300 oC. Moreover, step-like undulating fracture morphology of the core is observed along printing layer, which shows that the coating process has an important influence on the mechanical properties of ceramic parts. |
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Keywords: | SLA Alumina core Yield pseudoplastic paste |
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