

Journal of the Korean Ceramic Society 2000;37(3): 201. 
$80Al_2O_320Al$ 복합재료의 내열충격성: 실험과 유한요소 해석 
김일수, 신병철 
동의대학교 신소재공학과 
Thermal Shock Resistance of $80Al_2O_320Al$ Composites: Experiments and Finite Element Analysis 





ABSTRACT 
Thermal shock resistance of 80Al2O320Al composite and monolithic alumina ceramics was compared. Fracture strength was measured by using a 4pont bending test after quenching. Thermal stresses of the ceramics and ceramicmetal 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 Al2O3Al composite when the temperature difference of 205$^{circ}C$ used. 
Key words:
Thermal shock resistance, Finite element analysis, $Al_2O_320Al$ composite, Monolithic alumina 


