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采用热重分析实验研究了用磁控溅射沉积制备的Fe-75％Cu(质量分数)纳米涂层在低氧压条件下(只有Fe可被氧化)的氧化,探讨了纳米晶粒尺寸及氧分压对双相合金高温氧化机制的影响.与Fe-75Cu铸态合金在高、低氧压条件下以及Fe-75Cu纳米涂层在空气中氧化时形成的复杂结构的氧化膜不同,Fe-75Cu纳米涂层在低氧压下氧化时在富铜单相区上面形成单一的氧化铁.降低环境氧势并同时配以相微细化处理,可以显著降低合金的活泼组元发生单一外氧化所需的临界浓度.
The thermogravimetric analysis was used to study the oxidation of Fe-75% Cu (mass fraction) nano-coating prepared by magnetron sputtering deposition under low oxygen pressure (only Fe can be oxidized). The effects of nano-scale grain size and The effect of oxygen partial pressure on the mechanism of high-temperature oxidation of duplex alloys is different from that of Fe-75Cu alloy under the conditions of high and low oxygen pressure and the oxidation of Fe-75Cu nano-coating in the air. Fe -75Cu nanostructured coatings formed a single iron oxide on the copper-rich single-phase zone when oxidized at low oxygen pressure.Improvement of the ambient oxygen potential and the simultaneous microfabrication of the phases can significantly reduce the single external oxidation of the active components of the alloy The critical concentration required.