Highly dense and fine-grained SiC with a Sc-nitrate sintering additive

Title
Highly dense and fine-grained SiC with a Sc-nitrate sintering additive
Author(s)
윤당혁노비얀토알피안민봉기유현우
Keywords
SILICON-CARBIDE CERAMICS; RARE-EARTH-OXIDES; OXIDATION BEHAVIOR; MECHANICAL-PROPERTIES; THERMODYNAMIC CALCULATION; SICF/SIC COMPOSITES; WETTING BEHAVIOR; DENSIFICATION; MICROSTRUCTURE; INFILTRATION
Issue Date
201403
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.34, no.3, pp.825 - 830
Abstract
To explain the sintering behavior of 5 wt.% Sc-nitrate-added SiC, which showed a 99.3% density with the fine 156 nm-sized grains, a microstructural study using high resolution electron microscopy (HREM) was performed and the results were compared with those of Tm-added SiC, which had a mean grain size of 753 nm. Contact flattening was proposed as a governing sintering mechanism for Sc-added SiC based on the experimental observations of an inter-granular phase thinner than 1 nm along with the straight grain boundaries. On the other hand, the Tm-added SiC showed a several nm-thick inter-granular phase with a curved grain boundary morphology, which is the typical microstructure that can be obtained by a solution-reprecipitation mechanism combined with Ostwald ripening. (C) 2013 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/32932http://dx.doi.org/10.1016/j.jeurceramsoc.2013.10.001
ISSN
0955-2219
Appears in Collections:
공과대학 > 신소재공학부 > Articles
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