矽含量對鐵矽碳三元合金高溫氧化之影響

Effect of Si-content on the High-Temperature Oxidation of Fe-Si-C Ternary Alloys in Dry Air

本研究探討含三種不同矽含量（1, 3, 6Si）之鐵矽碳三元合金，在600 ~ 1000℃空氣下之氧化行為。研究結果顯示，三種合金之氧化動力學呈現不規則趨勢，但氧化增重變化量皆隨溫度上升而增加；然而6Si合金之抗氧化性明顯優於其他合金。氧化後，三種合金主要生成氧化鐵（Fe2O3/Fe3O4），並在氧化物內層有氧化鐵矽（Fe2SiO4）或氧化矽的富集區域生成。

Effect of Si-content on the oxidation of three Fe-Si-C alloys containing 1Si, 3Si and 6Si was studied in dry air at 600 ~ 1000 ℃. The oxidation kinetics generally revealed complex and irregular in all cases, although the overall weight-gain data increased with increasing temperature. It was found that the 6Si-alloy exhibits the superior oxidation-resistance, as compared to the lower Si-content alloys. The scales formed on all alloys were composed of mostly Fe2O3/Fe3O4, while minor amounts of Fe2SiO4- or SiO2- enriched zone were observed in the scale/substrate interface.