Fe_3Al金属间化合物硫化腐蚀中晶粒变化及晶界扩散研究  

Grain-boundary Diffusion and Grain Alteration of Intermetallic of Fe_3Al under Sulphidation Attack

作　　者：田晓峰[1] 王昕[1] 尹衍升 韩野[1] 

机构地区：[1]中国海洋大学材料科学与工程研究院,青岛266003

出　　处：《人工晶体学报》2008年第3期726-729,共4页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50672090)

摘　　要：本文采用真空熔炼法制备了Fe3Al金属间化合物,借助SEM,XRD,EDX等手段研究了Fe3Al在O-S混合气氛下800～1000℃的高温腐蚀行为及其中的晶相变化、晶界扩散过程,并从热力学和动力学方面对其腐蚀机理进行了分析。结果表明:Fe3Al合金在600～900℃范围内,具有较好的抗高温腐蚀性能。当温度超过1000℃或长时间腐蚀时,腐蚀速度迅速增加。Intermetallic compound（IMC）of Fe3Al was prepared by vacuum melting.Corrosion behavior,phase change and diffusion of Fe3Al at 800-1000 ℃ in O-S mixed atmosphere were studied by scanning electron microscopy（SEM）,X-ray diffraction and energy dispersive X-ray detector（EDX）.Thermodynamic and kinetic mechanisms of corrosion were discussed.It was concluded that Fe3Al has perfect corrosion resistance at 600-900 ℃,but the corrosion speed increased greatly when the temperature is higher then 1000 ℃.

关 键 词：FE3AL金属间化合物 硫化 腐蚀 

分 类 号：O78[理学—晶体学]