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J. Korean Ceram. Soc. > Volume 37(3); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(3): 201.
$80Al_2O_3-20Al$ 복합재료의 내열충격성: 실험과 유한요소 해석
김일수, 신병철
동의대학교 신소재공학과
Thermal Shock Resistance of $80Al_2O_3-20Al$ Composites: Experiments and Finite Element Analysis
Thermal shock resistance of 80Al2O3-20Al composite and monolithic alumina ceramics was compared. Fracture strength was measured by using a 4-pont bending test after quenching. Thermal stresses of the ceramics and ceramic-metal composites were calculated using a finite element analysis. The bending strength of the Al2O3 ceramics decreased catastropically after quenching from 20$0^{circ}C$ to $0^{circ}C$. The bending strength of the composite also decreased after quenching from 200~2$25^{circ}C$, but the strength reduction was much smaller than for Al2O3. The maximum thermal stress occured in the monolithic alumina ceramics when exposed to a temperature difference of 20$0^{circ}C$ was 0.758 GPa. The same amount of stress occured in the Al2O3-Al composite when the temperature difference of 205$^{circ}C$ used.
Key words: Thermal shock resistance, Finite element analysis, $Al_2O_3-20Al$ composite, Monolithic alumina
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