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Al-Cu 다결정 리본의 응고거동에 미치는 휠조건의 영향
김주형,이상목,홍준표 ( Ju Hyung Kim,Sang Mok Lee,Chun Pyo Hong ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.3
N/A The effect of wheel surface condition on solidification behavior of Al-Cu ribbon was investigated in order to establish extreme levels of heat extraction. The condition of wheel surface was changed either by heating the wheel surface up to 200℃ or by coating boron nitride(BN) onto the rim of a wheel. Heating the wheel surface up to 200℃ improved the wetting behavior between the molten metal and the rotating wheel, leading to an increase in the ratio of columnar structure to the entire thickness of Al-4.3wt%Cu and Al-33.2wt%Cu ribbons. For Al-4.3wt%Cu ribbon, assuming one grain as a single heterogeneous nucleation event at the contact point, the nucleation density with the wheel surface heated to 200℃, was 4×10^6/㎟, and in the cases of BN coating with thin and thick layers, 10^5/㎟ and 5×10⁴/㎟, respectively. The largest cooling capacity of the wheel corresponded to the heated wheel surface, and as the thickness of BN coating layer increased, the cooling capacity of the wheel gradually decreased.