靜磁場與不同濃度對錫鉛合金之方向性凝固結構之影響分析

本研究是以方向性凝固製備錫鉛合金，使用不同成分之錫鉛合金Sn-10wt.%Pb、Sn-37wt.%Pb以及Sn-60wt.%Pb作為研究材料，施加磁鐵所產生的磁場研究凝固過程，使用不同的控制參數作出六種不同之實驗組別，分析巨觀及微觀金相組織、冷卻曲線、溫度梯度、成長速率、晶粒尺寸及硬度值比較。實驗結果分析可知，不同成分錫鉛合金之含鉛量越高，其硬度值越小。以有無施加磁鐵之觀察橫切面之金相組織，可以發現有施加磁鐵之組別，其硬度值會比無施加磁鐵之組別還大，原因是有施加磁鐵之組別受到強力磁鐵之影響，使內部晶粒尺寸細化，而整體之硬度值上升之現象。純鉛之密度相較於純錫之密度高，因此在分析不同成分之錫鉛合金之密度時，含鉛成分越高之錫鉛合金，其密度較高，熔點與沸點也會上升。

關鍵字

方向性凝固；錫鉛合金；磁場；金相組織

並列摘要

This study prepared tin-lead alloys for directional solidification, using tin-lead alloy (Sn-10wt.%Pb)、(Sn-37wt.%Pb) and (Sn-60wt.%Pb) of different compositions as the research materials, with the use of the magnetic field effect applying a strong magnetic field to the solidification process. Through six experiments various with control parameters, the study is to analyise the macro metallographic structure and micro one, cooling curve, temperature gradient, growth rate, grain size and hardness. The experimental results show that the hardness is smaller when the lead composition is higher. Observing the metallographic structure on the cross-section, it can be found that the hardness with the magnetic field applied is higher than the that without. The influence of the magnetic field makes the internal grain size refine and the overall hardness increases. The density of pure lead is higher than pure tin. Therefore, the density and the melting point and boiling point is higher as the lead composition is higher.