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http://dx.doi.org/10.3795/KSME-A.2010.34.11.1715

Characterization of Crack Healing of Si3N4 Ceramic Structures According to Crack Length and Coating Methods  

Nam, Ki-Woo (Division of Advanced Materials Science and Engineering, Pukyong Nat'l Univ.)
Moon, Chang-Kwon (Division of Advanced Materials Science and Engineering, Pukyong Nat'l Univ.)
Park, Sang-Hyun (Dept. of UR Interdisciplinary program of Mechanical Engineering, Graduate School, Pukyong Nat'l Univ.)
Eun, Kyung-Ki (Dept. of UR Interdisciplinary program of Mechanical Engineering, Graduate School, Pukyong Nat'l Univ.)
Kim, Jong-Soon (NGE Tech)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.34, no.11, 2010 , pp. 1715-1720 More about this Journal
Abstract
In this study, we analyzed the crack-healing characteristics of specimens; different crack lengths and coating methods of $Si_3N_4$ ceramic structures with long cracks were analyzed. Cracks with lengths of about $100-500\;{\mu}m$ were obtained using a Vickers indenter for a load of 24.5-98 N. In the case of a crack obtained by applying a load of 24.5 N, the crack-healed specimen with $SiO_2$ nanocolloid coating exhibited the highest bending strength, which was higher than that of a smooth specimen by 140%, but the bending strength of a crack-healed specimen that had a $SiO_2$ nanocolloid coating and originally had multiple cracks was lower than that of a smooth specimen. However, when compared to the cracked specimens, the bending strength of most specimens with multiple cracks increased slightly. On the basis of these results, the crack-healing characteristics of $Si_3N_4$ ceramic structures with multiple indentations were studied for different coating methods. The most effective coating method for long-crack specimens was hydrostatic pressure coating.
Keywords
$Si_3N_4$ Ceramics; Bending Strength; Crack Healing; Crack Lengths; Coating Methods; $SiO_2$ Nano Colloid;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 0
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