Browse > Article
http://dx.doi.org/10.3795/KSME-A.2007.31.4.425

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

Kim, Hae-Suk (부경대학교 대학원)
Kim, Mi-Gyeong (경도대학 대학원)
Kim, Jin-Uk (한국기계연구원 원자력공인사업단)
An, Seok-Hwan (부경대학교 기계공학부)
Nam, Gi-U (부경대학교 신소재공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.4, 2007 , pp. 425-431 More about this Journal
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
$Al_2O_3/SiC$ Composite Ceramics; Additive Powder $Y_2O_3$; Bending Strength; Crack Healing; Dominant Frequency; Elastic Wave; Wavelet Analysis;
Citations & Related Records

Times Cited By SCOPUS : 6
연도 인용수 순위
1 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   DOI   ScienceOn
2 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   DOI   ScienceOn
3 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   DOI
4 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   DOI
5 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   DOI   ScienceOn
6 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   DOI   ScienceOn
7 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)
8 Lange, J. J. and Gupta, T. K., 1970, 'Crack-Healing by Heat Treatment,' J. Am. Ceram. Soc., Vol. 53, pp. 54-55   DOI
9 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   DOI
10 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   DOI   ScienceOn
11 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   DOI   ScienceOn