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Fabrication of Si 2 N 2 O Ceramic Foam by Combination of Direct Ink Writing and Biological Foaming Techniques
Author(s) -
Jin Haize,
Yang Zhihua,
Li Hailiang,
Jia Dechang,
Zhou Yu
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901541
Subject(s) - materials science , ceramic , microstructure , fabrication , composite material , rheology , suspension (topology) , foaming agent , inkwell , compressive strength , phase (matter) , yeast , chemical engineering , porosity , chemistry , medicine , mathematics , organic chemistry , pure mathematics , biochemistry , engineering , alternative medicine , pathology , homotopy
Si 2 N 2 O ceramic foam is developed by the combination of biological foaming (BF) technique and direct ink writing (DIW). The effect of yeast content on the rheological properties of inks and phase composition, microstructure, and mechanical properties of ceramic foam are systematically investigated. The inks consist of different proportions of yeast suspension and ceramic start powder suspension that exhibit superior printing behavior and proper fermentation capacity. Yeast cells and additives derived from commercial active yeast are fully utilized as BF agent, nutrient, and emulsifier. The variation of yeast contents bring about the evolution of phases, pores density, and mechanical properties of ceramic parts. The Si 2 N 2 O foams with porosities from 61.5 ± 4.3% to 71.0 ± 4.5% are successfully fabricated. The corresponding compressive strength decreases from 33.1 ± 2.6 to 8.3 ± 1.5 MPa. As a result, a promising reference for the design and preparation of BF ceramic ink and hierarchical ceramic foam based on DIW is provided.