熔融金屬에 의한 Ceramic Oxides 에서의 Wetting에 關한 硏究

The Wetting of fusion cast Al₂O₃ brick and Al₂O₃-ZrO₂ brick by liquid Ag was studied by the sessile drop technique in Ar atmosphere. In this experiment, the specimens were photographed per 20℃ with increasing temperature from 960℃, melting point of Ag. And the method of photographing was carried out by shadow technique. The cosine of the contact angle increased linearly with increasing temperature in both systems. And the relation between the cosine of the contact angle and the temperature was Cos θ=-1.132+0.75×10 -3 T for Al₂O₃ brick and Cos θ =-1.706+1.215×10 -3 T for Al₂O₃-ZrO₃ brick. In both systems, the contact angle decreased as the surface of substrate became smoother. The work of adhesion, which was 503.5 ergs/㎠ for Al₂O₃ brick and 393.6 ergs/㎠ for Al₂O₃-ZrO₂ brick at 960℃, increased parabolically with increasing temperature in both systems.