本硏究採用高矽含鉬球墨鑄鐵於700 °C進行熱浸鍍純鋁，探討矽和富鉬碳化物對鋁 塗層的成長行爲影響。實驗結果顯示，試片熱浸鋁後之塗層由外而內分別爲外鋁層、鐵鋁 介金屬層與夾雜在鐵鋁介金屬層和底材間的積矽層。積矽層的生成與鑄鐵本身的富鉬碳化 物及層狀波來體皆會減緩鐵鋁介金屬層的成長。隨著熱浸時間增力，積矽層及富鉬碳化物 各別會以矽顆粒及分解含鉬碳化物流出底材，導致外鋁層具有較大之厚度。

In this study, high silicon ductile iron alloyed with molybdenum was aluminized by hot-dipping into a pure aluminum bath at 700 °C. The effect of silicon and Mo-rich carbides in the steel substrate on the growth behavior of aluminide coating was studied. The results showed that the aluminide coating consisted of three layers, A1 outer layer, Fe-Al intermetallic layer and Si pile-up layer, from the coating surface to the substrate. The formation of Si pile-up layers after hot-dipping and the existences of Mo-rich carbides and laminated pearlite in the substrate have the same effect of reducing the growth of Fe-Al intermetallic layer. As the hot-dipping time increased, the Si pile-up layers and Mo-rich carbides decomposed into Si particles and Mo carbides and then flowed out from the steel substrate. This resulted in the A1 outer layers possessed the larger thickness.