钛对FeAl金属间化合物高温氧化行为的影响  

The Effect of Ti Addition on Oxidation Behavior of FeAl Intermetallic Alloy

作　　者：郦定强[1] 林栋梁 徐芸[2] 

机构地区：[1]上海交通大学国家教委高温材料及高温测试开放实验室 [2]郑州粮食学院机械系

出　　处：《材料工程》1998年第9期14-17,共4页Journal of Materials Engineering

摘　　要：探究了钛元素对ＦｅＡｌ金属间化合物在１０００℃和１１００℃大气环境下的循环氧化行为的影响。合金的氧化动力学过程通过增重法测定，氧化产物通过Ｘ射线衍射、能谱和扫描电镜等鉴定。实验结果表明，加钛和未加钛Ｆｅ－３６．５Ａｌ合金的氧化动力学曲线均可拟合为抛物线：（ΔＷ／Ｓ）２＝Ｋｐｔ＋Ｃ。加钛ＦｅＡｌ合金在１０００℃和１１００℃时的Ｋｐ值分别为２．４，３．３ｍｇ２ｃｍ－４ｈ－１；而未加钛ＦｅＡｌ合金在１０００℃和１１００℃时的Ｋｐ值分别为１．３，２．０ｍｇ２ｃｍ－４ｈ－１。两种合金的表面氧化层有所不同，其中加钛ＦｅＡｌ合金的表面氧化物不仅有Ａｌ２Ｏ３，而且还有ＴｉＯ。研究表明，钛元素对ＦｅＡｌ合金抗氧化性能的作用来自合金表面ＴｉＯ的形成以及剥落层与基体粘合力的提高。The influence of titanium on the high temperature cyclic oxidation behaviors of FeAl intermetallic alloys in ambient atmosphere at 1000℃ and 1100℃ have been investigated in ths paper The oxidation kinetics of FeAl alloys was examined by weight change method and oxide products were examined by X ray diffraction,SEM and EDS It is shown that the oxidation kinetic curves of both Ti doped and Ti undoped Fe 36 5Al alloys were described as different parabolas followed the formula:(ΔW/S) 2=K p+C The K pvalues,constants of parabolic oxidizing rate,are about 2 4,3 3mg 2cm -4 h -1 for Ti doped FeAl alloy and about 1 3,2 0mg 2cm -4 h -1 for Ti undoped FeAl alloy when oxidizing at 1000℃ and 1100℃ respectively The oxidation surfaces are different between Ti undoped and Ti doped FeAl alloys and oxides of the latter are not only Al 2O 3 but also TiO The effect of Ti addition on the oxidation resistance of FeAl alloy was resulted from the formation of TiO film on the surface of the alloy as well as the strengthening the connections of the scale and substrate based on the analyses

关 键 词：FEAL 金属间化合物 氧化动力学 

分 类 号：TG131[一般工业技术—材料科学与工程]