The effect of Si content, firing temperature, and urea additive on the properties of nitride-bonded SiC refractories

The effect of Si content, firing temperature, and urea additive on the properties of... The microstructure-properties relationship of nitride-bonded SiC refractories has been studied in the presence of Si and urea additives. The samples were prepared by mixing, shaping, and firing at 1450 to 1600°C in a controlled atmosphere. Physical properties were evaluated by measuring density, porosity, and cold crushing strength (CCS). XRD, SEM, and TEM were employed to study the phase and microstructural evolution. The increase of Si enhanced the bond formation, which contributed to density and strength improvement. The firing temperature had the same effect up to 1550°C. At 1600°C, however, the density and CCS decreased, which were attributed to nitride phase decomposition. The urea addition improved the mechanical properties and increased the depth of nitridation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

The effect of Si content, firing temperature, and urea additive on the properties of nitride-bonded SiC refractories

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Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer Science+Business Media, Inc.
Subject
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1007/s11148-007-0100-y
Publisher site
See Article on Publisher Site

Abstract

The microstructure-properties relationship of nitride-bonded SiC refractories has been studied in the presence of Si and urea additives. The samples were prepared by mixing, shaping, and firing at 1450 to 1600°C in a controlled atmosphere. Physical properties were evaluated by measuring density, porosity, and cold crushing strength (CCS). XRD, SEM, and TEM were employed to study the phase and microstructural evolution. The increase of Si enhanced the bond formation, which contributed to density and strength improvement. The firing temperature had the same effect up to 1550°C. At 1600°C, however, the density and CCS decreased, which were attributed to nitride phase decomposition. The urea addition improved the mechanical properties and increased the depth of nitridation.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Mar 26, 2007

References

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