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Journal of Materials Engineering and Performance
Erschienen in: Journal of Materials Engineering and Performance 12/2020

18.11.2020

Gel-Casting Prepared Porous Si3N4 Ceramics with Different Contents of Y2O3 and Al2O3 Additives

verfasst von: Chunrong Zou, Shaojun Guo, Xiaosong Zhou, Song Li, Chunlei Yan, Tongsheng Shen

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 12/2020

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Abstract

Porous Si3N4 ceramics were prepared via a controlled gel-casting process followed by gas pressure sintering with 8 wt.% Y2O3 and Al2O3 additives. The gel-casting parameters including slurry pH value, AM: MBAM ratio, degassing procedure, drying condition and decarbonize process were optimized, and the effects of different Y2O3: Al2O3 ratios on the microstructure and properties of the Si3N4 ceramics were investigated. With an optimized gel-casting process, a high solid loading of 46.5 vol.% was achieved, and as the Y2O3 content decreased from 6 to 1 wt.%, the porosity of Si3N4 ceramics declined from 36.3 to 27.5% while the β-Si3N4 phase content reduced from 38.9 to 15.0%. The bending strength and elastic modulus of the ceramics varied with different Y2O3: Al2O3 ratios and were influenced by the porosity as well as the tailored interlocking structure of elongated β-Si3N4 grains. The Si3N4 ceramics also exhibited low and stable dielectric constants.
Vorheriger Artikel Fabrication of High-Strength Zr-Based Composites by Spark Plasma Sintering
Nächster Artikel Pressureless Sintering Kinetics of NiFe2O4 Ceramic Fabricated by Slip Casting

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Metadaten
Titel
Gel-Casting Prepared Porous Si3N4 Ceramics with Different Contents of Y2O3 and Al2O3 Additives
verfasst von
Chunrong Zou
Shaojun Guo
Xiaosong Zhou
Song Li
Chunlei Yan
Tongsheng Shen
Publikationsdatum
18.11.2020
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 12/2020
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-020-05314-7

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