Rare-earth nitrate additives for the sintering of silicon carbide

Title
Rare-earth nitrate additives for the sintering of silicon carbide
Author(s)
윤당혁노비얀토알피안한승우유현우
Keywords
MECHANICAL-PROPERTIES; SIC-CERAMICS; OXIDATION BEHAVIOR; SICF/SIC COMPOSITES; FRACTURE-TOUGHNESS; THERMODYNAMIC CALCULATION; ALUMINUM NITRIDE; FUSION-REACTORS; GRAIN-GROWTH; PHASE
Issue Date
201312
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.33, no.15-16, pp.2915 - 2923
Abstract
Fourteen rare earth elements in their nitrate form were evaluated as sintering additives for beta-SiC. All rare earth nitrates transformed to oxides by a reaction with the surface-adsorbed thin SiO2 during heat treatment, which enhanced the density of the SiC monolith without decomposing SiC. In particular, Sc, Yb, Tm, Er and Ho were quite effective sintering additives; a>99% relative density was observed by the addition of 5 wt.% rare earth oxide, whereas the other rare earth additives (Lu, Dy, Tb, Gd, Eu, Sm, Nd, Ce and La) revealed 77-92% density. Moreover, a fine 156 nm-sized SiC grain could be acquired by Sc addition, whereas the other additives showed a SiC grain size of approximately 1 mu m. The mean hardness and K-Ic of the dense SiC containing rare earth elements were 24-27 GPa and 3.3-5.0 MPa m(1/2), respectively. (C) 2013 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/28108http://dx.doi.org/10.1016/j.jeurceramsoc.2013.05.017
ISSN
0955-2219
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공과대학 > 신소재공학부 > Articles
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