超重力场辅助燃烧合成技术制备Fe_3Al合金及其抗氧化性能研究  

Preparation of Fe_3Al Alloy by Combustion Synthesis Melt-casting under Ultra-high Gravity and its Oxidation Resistance

作　　者：麦培林[1] 贺淑莉[1] 

机构地区：[1]首都师范大学物理系,北京100048

出　　处：《首都师范大学学报（自然科学版）》2011年第3期1-4,共4页Journal of Capital Normal University：Natural Science Edition

摘　　要：本课题利用超重力场辅助的两步燃烧合成技术成功制备了Fe3Al合金.首先利用Al/Fe2O3之间的铝热反应释放的高热量使得产物(Fe和Al2O3)转变成高温混合熔体,Fe熔体在1 000 g超重力场的作用下迅速从高温混合熔体中分离,并和底部的纳米铝粉发生二次燃烧合成,生成致密的Fe3Al金属间化合物.Fe3Al样品中仅存在极少量的气孔,孔径小于2μm.该Fe3Al合金在低于1 000℃温度下表现出良好的抗氧化性能,有望成为一种优良的高温结构材料.Fe3Al alloy could be synthesized successfully by combustion synthesis melt-casting under ultra-high gravity.The combustion reaction instantaneously released a large of heat,and make the resultants（Fe and Al2O3） melt.The iron melt could rapidly separate from the mixed melt due to the huge difference in density,and further reacted with the nano aluminium powder to from Fe3Al intermetallic compound.Fe3Al melt could be rapid densification at the drive of ultra-high gravity.The porosity in the Fe3Al alloy ingot was very small,and the size of the porosity was less than 2μm in general.Therefore,the as-synthesized Fe3Al alloy exhibited excellent oxidation resistance under high temperature.

关 键 词：FE3AL合金 燃烧合成 超重力场 抗氧化性能. 

分 类 号：TG249.4[金属学及工艺—铸造]