研究生: |
梁慈玉 Cih Yu Liang |
---|---|
論文名稱: |
高矽含鉬鑄鐵熱浸鋁及其高溫氧化後之顯微結構 Effect of the Microstructure on Hot-dip Aluminizing of High Silicon Ductile Irons Alloyed With Molybdenum After High Temperature Oxidation |
指導教授: |
王朝正
Chaur-Jeng Wang |
口試委員: |
雷添壽
Tien-Shou Lei 鄭偉鈞 Wei-Chun Cheng |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 103 |
中文關鍵詞: | 高矽含鉬鑄鐵 、熱浸鍍鋁 、富矽層 、碳化鉬 |
外文關鍵詞: | High silicon ductile irons alloyed with molybden, Hot dip Al, Si pile-up layers, Molybdenum carbide |
相關次數: | 點閱:361 下載:6 |
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本實驗使用高矽含鉬球墨鑄鐵於700 C進行熱浸鍍純鋁,觀察矽和富鉬碳化物對外鋁層和鐵鋁介金屬層成長的影響。熱浸鍍後之高矽含鉬鑄鐵再於750 C進行高溫氧化試驗,探討矽和富鉬碳化物對高溫氧化時鐵鋁交互擴散過程的影響。
實驗結果顯示,熱浸鋁後試片之塗層由外而內分別為外鋁層、鐵鋁介金屬層(外側的FeAl3 + 內側的Fe2Al5)與夾雜在鐵鋁介金屬層和底材間的富矽層。隨著熱浸時間增加,富鉬碳化物會以碳化物型式存在外鋁層中,碳化鉬含量亦會增加;鐵鋁介金屬層向底材方向成長,矽以顆粒狀留在外鋁層中。高矽含鉬球墨鑄鐵熱浸純鋁後高溫氧化,由於石墨氧化,造成孔洞與縫隙,但碳化鉬於高溫氧化時仍存在於鐵鋁介金屬層中,且能阻礙孔洞與縫隙的延伸。
In this experiment, high silicon ductile irons alloyed with molybdenum was coated by hot-dipping into a pure aluminum bath at 700 C. The effect of silicon and molybdenum-rich carbides in the steel substrate on the formation of aluminum layer and external aluminum layer on high silicon ductile irons alloyed with molybdenum was studied. High-temperature oxidation of the hot-dipped specimens was also performed in order to understand the effect of silicon and molybdenum-rich carbides in the steel substrate on the growth of the Fe-Al intermetallic layer. The results showed that the coating layer consisted of three layers, in the sequence of Al, Fe-Al intermetallic and Si pile-up layers from the external topcoat to the substrate. The molybdenum carbide in the steel substrate can be observed in the aluminum layer after hot-dipping. As the hot-dipping time increased, the amount of molybdenum carbide in the aluminum layer increased and the silicon pile-up at the interface between the intermetallic layer and substrate transformed into silicon particles in the aluminum layer. In the high-temperature oxidation test, Graphite scattered in the aluminum layer was oxidized, leaving cracks and pores in the aluminized layer for oxygen to penetrate inward. However, the molybdenum carbide impeded the growths of cracks and pores.
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