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

균열 길이와 코팅방법에 따른 Si3N4의 균열 치유 특성

  • 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)
  • Received : 2010.07.19
  • Accepted : 2010.09.01
  • Published : 2010.11.01

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

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Cited by

  1. Nano-Colloid vol.38, pp.10, 2014, https://doi.org/10.3795/KSME-A.2014.38.10.1117