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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Strength of Crack Healed-Specimen and Elastic Wave Characteristics of Al2O3/SiC Composite Ceramics

알루미나 탄화규소 복합세라믹스 균열치유재의 강도와 탄성파 특성

  • 김해숙 (부경대학교 대학원) ;
  • 김미경 (경도대학 대학원) ;
  • 김진욱 (한국기계연구원 원자력공인사업단) ;
  • 안석환 (부경대학교 기계공학부) ;
  • 남기우 (부경대학교 신소재공학부)
  • Published : 2007.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

[ $Al_2O_3/SiC$ ]composite ceramics were sintered to evaluate the bending strength and elastic wave characteristics. The three-point bending test was carried out under room temperature. The elastic wave was detected by fracture wave detector. The crack healing behavior was investigated from 1373 K to 1723 K. The bending strength of $Al_2O_3/SiC$ composite by nanocomposite is higher than that of $Al_2O_3$ monolithic. Crack-healing behavior depended on an amount of additive powder $Y_2O_3$. In $Al_2O_3/SiC$ composite ceramics with 3 wt. % $Y_2O_3$ for additive powder, the bending strength at 1573 K is about 100% increase than that of the smooth specimens. From the result of wavelet analysis of elastic wave signal, the smooth specimen and heat treated specimen of $Al_2O_3$ monolithic and $Al_2O_3/SiC$ composite ceramics showed characteristics of frequency about 58 kHz. The strength of $Al_2O_3/SiC$ composite ceramics was a little higher than those of $Al_2O_3$ monolithic. The dominant frequencies were high with increasing of $Y_2O_3$ for additive powder. The dominant frequencies had direct connection with the bending strength.

Keywords

References

  1. Filsinger, D., Gutmann, C., Schulz, A. and Wittig, S., 1997, 'Design of Thermally High-Loaded Ceramic Components for Gas Turbines,' J. Eur. Ceram. Soc., Vol. 17, pp. 1655-1663 https://doi.org/10.1016/S0955-2219(97)00011-3
  2. Hirano, K., 2005, 'Application of Eutectic Composites to Gas Turbine System and Fundamental Fracture Properties up to 1700 $^{\circ}C$,' J. Eur. Ceram. Soc., Vol. 25, pp. 1191-1199 https://doi.org/10.1016/j.jeurceramsoc.2005.01.003
  3. Lange, J. J. and Gupta, T. K., 1970, 'Crack-Healing by Heat Treatment,' J. Am. Ceram. Soc., Vol. 53, pp. 54-55 https://doi.org/10.1111/j.1151-2916.1970.tb12002.x
  4. Lange, J. J. and Radford, K. C., 1970, 'Healing of Surface Cracks in Polycrystalline $Al_2O_3$,' J. Am. Ceram. Soc., Vol. 53, pp. 420-421 https://doi.org/10.1111/j.1151-2916.1970.tb12148.x
  5. Ando, K., Chu, M. C., Kobayashi, Y., Yao, F. and Sato, S., 1999, 'Crack Healing Behavior and High Temperature Strength of Silicon Nitride Ceramics,' Jpn. Soc. Mech. Eng., Vol. 65, pp. 1132-1139 (in Japanese)
  6. Lee, S. K., Ishida, W., Lee, S. Y., Nam, K. W. and Ando, K., 2005, 'Crack-Healing Behavior and Resultant Strength Properties of Silicon Carbide Ceramic,' J. Eur. Ceram. Soc., Vol. 25, pp. 569-576 https://doi.org/10.1016/j.jeurceramsoc.2004.01.021
  7. Ando, K., Shirai, Y., Nakatani, M., Kobayashi, Y. and Sato, S., 2002, '(Crack-Healing+Proof Test): a New Methodology to Guarantee the Structural Integrity of a Ceramics Component,' J. Eur. Ceram. Soc., Vol. 22, pp. 121-128 https://doi.org/10.1016/S0955-2219(01)00236-9
  8. Ahn, S. H., Nam, K. W. and Ando, K., 2004, 'The Bending Strength of Brittle Materials and The Characteristics of the Elastic Wave Signal by Vickers Indentation,' Key Engng. Mater., Vol. 261-263, pp. 1635-1640 https://doi.org/10.4028/www.scientific.net/KEM.261-263.1635
  9. Kim, J. W., Park, B. W., Ahn, S. H. and Nam, K. W., 2005, 'Elastic Wave Signal Characteristics of SiC Ceramics with Crack Healing Ability by Wavelet Analysis,' Key Engng. Mater., Vol. 297-300, pp. 2046-2051 https://doi.org/10.4028/www.scientific.net/KEM.297-300.2046
  10. Nam, K. W., Kim, M. K., Kim, H. S., Kim, J. W. and Ahn, S. H., 2006, 'Bending Strength and Elastic Wave Characteristics of $Si_3N_4$ Monolithic and $Si_3N_4/SiC$ Composite Ceramics by Wavelet Analysis', Inter. J. Modern Phys. B, Vol. 20, pp. 4279-4284 https://doi.org/10.1142/S0217979206041227
  11. Lawn, B. R., Evans, A. G. and Marshall, D. B., 1980, 'Elastic/Plastic Indentation Damage in Ceramics: The Median/Radial Crack System,' J. Am. Ceram. Soc., Vol. 63, pp. 574-581 https://doi.org/10.1111/j.1151-2916.1980.tb10768.x

Cited by

  1. /SiC Composites vol.34, pp.1, 2014, https://doi.org/10.7779/JKSNT.2014.34.1.23
  2. Colloidal vol.33, pp.7, 2009, https://doi.org/10.3795/KSME-A.2009.33.7.652
  3. Nano Colloidal Added vol.33, pp.11, 2009, https://doi.org/10.3795/KSME-A.2009.33.11.1233