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Geometrically Complex Silicon Carbide Structures Fabricated by Robocasting
Author(s) -
Cai Kunpeng,
RománManso Benito,
Smay Jim E.,
Zhou Ji,
Osendi María Isabel,
Belmonte Manuel,
Miranzo Pilar
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05276.x
Subject(s) - materials science , ceramic , composite material , spark plasma sintering , shear thinning , rheology , silicon carbide , shrinkage , colloid , volume fraction , extrusion , chemical engineering , engineering
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 , Al 2 O 3 , and Y 2 O 3 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.