Ni-Cu-Fe-Al合金在850℃空气中的氧化行为  

Oxidation behavior of Ni-Cu-Fe-Al alloys at 850 ℃

作　　者：李倩[1] 周科朝[1] 周涛[1] 李志友[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2009年第4期231-236,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2005CB623703);国家自然科学创新团队基金资助项目(50474051)

摘　　要：为研发铝电解惰性阳极连接导杆新材料,采用粉末冶金法制备Ni-Cu-Fe-Al四元合金,在850℃的空气气氛中进行氧化实验,并用XRD、SEM、EDS等测试设备对其表面氧化膜的成分、形貌和组成进行分析。结果表明,在该合金表面形成的氧化膜连续、致密,分为内、中、外三层,外层以铜镍复合氧化膜为主,中间层分布着岛状的铁氧化物,其中含有一定数量的NiFe2O4尖晶石相,内层为连续致密的Al2O3膜,能阻碍元素扩散,从而有效提高合金的高温抗氧化性能。Oxidation experiment was carried out using Ni-Cu-Fe-Al alloys specially made by PM at 850 ℃ in air atmosphere for developing novel material of inert anode＇s connecting rod of aluminum electrolysis. The morphology, composition and constituent of the surface oxidation film of the specimen are investigated by scanning electron microscope（SEM）, energy dispersion spectrometer（EDS）, X-ray defectoscope（XRD）, and so on. The experimental results show that the oxidation film of Ni-Cu-Fe-Al alloys is continuous and dense. The oxide scales consisted mainly of three layers, the outer layer is mainly nickel oxide and copper-oxide, the interlayer is island ferric oxide in which there are a few NiFe2O4 spinel phase, the innermost layer is continuously distributed Al2O3 which combining with the compact NiFe2O4 spinel obstructs the diffusion of the elements and improves the high temperature oxidation resistance of the studied alloy.

关 键 词：Ni—Cu—Fe-Al合金 氧化膜 尖晶石 

分 类 号：TG146.15[一般工业技术—材料科学与工程]