摘要
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 oxidation behavior of nano-sized Fe-75Cu coatings, prepared by sputtering deposition, was studied at 600 and 800°C under low oxygen pressures, by which only Fe can be oxidized. The results show that a continuous iron oxide scale formed beneath an external copper oxide scale on the Fe-75Cu coating oxidized in air, but an exclusive external iron oxide scale was present on the same coating when oxidized under low oxygen pressures. The mechanism was related to an enhancement of the outward diffusion of Fe due to the nano-sized nature of the coating, and also as a result of the low oxygen pressure in the environment, which decreased the rate of inward penetration of oxygen through the metal matrix.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2002年第6期561-564,共4页
Chinese Journal of Materials Research
基金
国家自然科学基金资助项目59725101
