Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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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
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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.

본 연구에서는 장균열을 가지는 Si3N4 세라믹스의 균열 길이와 코팅 방법에 따르는 균열 치유 특성을 규명하였다. 약 $100{\sim}500\;{\mu}m$의 균열 길이는 24.5 ~ 98 N의 하중을 사용하여 비커스 압자를 이용하여 만들었다. 24.5 N의 하중으로 만든 단균열의 경우, $SiO_2$ 나노 콜로이드 코팅된 균열재는 모재보다 약 140 % 증가한 가장 높은 굽힘 강도를 보였지만, 장균열은 모재보다 낮은 굽힘 강도를 나타내었다. 그러나 대부분의 장균열 시험편의 굽힘 강도는 균열재보다 약간 증가하였다. 이러한 결과에 따라서, 복수 압입에 의한 $Si_3N_4$ 세라믹스의 균열 치유 특성을 코팅방법에 따라 연구하였다. 장균열 시험편의 가장 효과적인 코팅 방법은 정수압코팅방법이었다.

Keywords

References

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