本研究主要探討矽含量對電磁鋼片氧化速率及銹皮生成之影響，電磁鋼片之含矽量範圍介於0.01～1.91 wt.%間。研究中利用熱重分析儀(TGA)量測不同矽含量之電磁鋼片於800℃至1000℃、空氣環境中氧化10小時之氧化增重。經TGA測試後之試片利用XRD分析銹皮結構，並以SEM及EDS觀察其顯微結構及其成份分佈。實驗結果指出，電磁鋼片的氧化速率、銹皮厚度隨著矽含量的增加而減少。在銹皮結構方面，含矽量0.51 wt.%之鋼片，在高溫時的氧化行為類似低碳鋼，銹皮成分包括Fe2O3、Fe3O4及Fe1-xO，並可在銹皮內部發現含矽氧化層呈現層狀分佈。含矽量1.14 wt.% 之鋼片，其氧化層厚度約為20～30 µm，銹皮具雙層結構，外層主要為Fe2O3，內層則為鐵矽氧化物，Fe3O4及Fe1-xO則幾乎不存在。矽含量為1.91 wt.%的鋼片，其鋼材組成成份內亦含0.293 wt.%的鋁含量，因此，所生成之銹皮主要為單層的含矽鋁氧化層；但在局部區域則可觀察到節瘤狀氧化物生成，此節瘤之銹皮結構主要為Fe2O3及Fe3O4；此外，也在具節瘤狀氧化物區域的基材相中觀察到內部氧化的現象。

另外，也利用管型爐模擬電磁鋼片於1200℃下進行熱處理時，矽含量（0.51～1.91 wt.%）對電磁鋼片氧化速率之影響，實驗結果指出，含矽電磁鋼在1200℃下氧化時，其氧化速率、銹皮厚度隨著矽含量的增加而上升，與先前討論結果不同。這是由於1200℃高於矽酸鹽的熔融溫度，在高溫時，液態的矽酸鹽將可幫助鐵離子的擴散。最後，矽元素及其含量在電磁鋼片氧化過程中所扮演之角色以及生長機制，都在本文中加以討論。

Effect of silicon content on the oxidation rate and scale formation of Si-containing steel was investigated. The silicon content in the steels was between 0.01 to 1.91 wt.%. Thermal-gravimetric analysis was carried out to measure the weight change of steels oxidized in the temperature range of 800℃~1000℃ in air atmosphere. In addition, tube furnace was employed to perform the oxidation test. The crystal structures of the oxides formed on steel were analyzed by XRD, and the microstructure and chemical compositions were examined and identified by SEM and EDS.

The result showed that the oxidation rate and scale thickness was decreased as the silicon content increased. The oxides formed on carbon steel (S00) and S05 steel were Fe2O3/Fe3O4/Fe1-xO. Banded-oxide scale was also observed in S05 steel. The scale with double-layer structure was observed in steel, consisting of an outer layer of Fe2O3 and an inner layer of SiO2. Both Fe3O4and Fe1-xO were not identified in S11 steel. A very thin layer of scale was formed on S19 steel at temperature below 1000℃. The scale consisted of Al2O3-rich passive film formed between the steel substrate and the outer Fe2O3. Nodular oxide was also found on the surface of S19 steel. The local breakdown of the oxide was responsible for oxide nodule formation.

Oxidation tests in horizontal tube furnace were also conducted at 1200℃. The results showed that the oxidation rate increased with increasing Si content in the steel, in contrast to that found below 1000℃. The formation of liquid phase fayalite (Fe2SiO4) was responsible for the high oxidation rate in high Si-containing steels.

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