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- Title
Geometrically Complex Silicon Carbide Structures Fabricated by Robocasting.
- Authors
Cai, Kunpeng; Román-Manso, Benito; Smay, Jim E.; Zhou, Ji; Osendi, María Isabel; Belmonte, Manuel; Miranzo, Pilar; Kleebe, H.-J.
- Abstract
Geometrically complex, three-dimensional (3-D) structures of SiC were produced by a colloidal printing method known as robocasting, followed by low-pressure spark plasma sintering ( SPS) to produce dense ceramic bodies. A concentrated, aqueous colloidal ink consisting of SiC, Al2 O3, and Y2 O3 particles in a dilute polymer solution with a total solids volume fraction of 0.44 was developed to have pseudoplastic behavior with yield stress rheology. Lattice structures consisting of extruded filaments deposited in an overall cylindrical or cuboid shape were printed through nozzles ranging in diameter from 150 to 330 μm. After printing, drying and calcining processes, the structures were sintered at 1700°C in argon by SPS. The final average grain size was 1-2 μm and samples displayed above 97% of theoretical density, showing ~22.8% linear shrinkage from green to sintered state.
- Subjects
SILICON carbide; CERAMICS design; SINTERING; PLASMA gases; RHEOLOGY; NOZZLES; COLLOIDS; ROASTING (Metallurgy)
- Publication
Journal of the American Ceramic Society, 2012, Vol 95, Issue 8, p2660
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2012.05276.x