Abstract
Graphite crucibles are widely used to metallurgical industries under very severe thermal stress conditions in high temperature. In this study situations of the temperature and thermal stress distributions are analyzed for a graphite crucible of an aluminum vapor deposition apparatus, using by ADINA finite element method. The analysis is carried out considering distinct difference of heat transfers on upper andlower level of the liquid aluminum inside of the crucible subjected to high frequencyinduction heating. These stress distributions of crucible were simulated to the thermalstress distributions in a circular disk subjected to local heating at the central area. Using the disk specimens of crucible materials, the thermal shock resistance and the thermal shock fracture toughness tests are carried out by means of arc discharge heating. In this study three kinds of specimen; namely (A) graphite material, (B) pitch impregnated graphite and (C) alumina impregnated material of (B) are used. Obtained results are compared and discussed on the fracture mechanical properties for thermal stress of the three crucible materials.
