镧和铈对Fe25Cr5Al合金高温氧化行为的影响  

Effect of La and Ce on High Temperature Oxidation Behavior of Fe25Cr5Al Alloys

作　　者：吴晓东[1] 王联进 王忠英 陈雪琴 王双[1] Wu Xiaodong;Wang Lianjin;Wang Zhongying;Chen Xueqin;Wang Shuang(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212000,China;Huaian CIRSI Co.,Ltd,Huaian 223000,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212000 [2]钢铁研究总院淮安有限公司,江苏淮安223000

出　　处：《稀有金属材料与工程》2021年第11期3837-3844,共8页Rare Metal Materials and Engineering

基　　金：Key Research and Development Program of Jiangsu Province(BE2018097)。

摘　　要：含稀土元素La、Ce的Fe25Cr5Al-RE合金和不含稀土的Fe25Cr5Al合金在1100℃的空气中进行了恒温氧化实验。采用扫描电子显微镜(SEM)观察氧化膜形貌,使用X射线衍射仪(XRD)结合能谱仪(EDS)分析氧化膜成分。结果表明,氧化1、20和300 h后,Fe25Cr5Al合金增重分别为0.08、0.84和4.41 mg·cm^(−2),Fe25Cr5Al-RE合金增重分别为0.03、0.35和0.92 mg·cm^(−2)。氧化后所有合金的氧化膜成分均为α-Al_(2)O_(3)。La、Ce能够促进合金形成致密、连续的氧化膜,显著提高了Fe25Cr5Al合金的抗高温氧化性能。此外,Fe25Cr5Al-RE合金氧化膜/基体界面存在稀土氧化物钉,使得氧化膜与基体的结合更加紧密,增强了氧化膜/基体粘附性。Fe25Cr5Al-RE合金氧化后,氧化膜内存在稀土氧化物,有效地防止了合金发生进一步氧化。Fe25Cr5Al alloys with and without rare earth(RE)elements La and Ce,namely Fe25Cr5Al-RE and Fe25Cr5Al alloys,were prepared and isothermal oxidation tests were conducted at 1100℃.The morphology of oxide scale was observed by scanning electron microscope(SEM),and the oxidation product was identified by energy disperse spectroscopy(EDS)coupled with X-ray diffraction(XRD).Results show that after oxidation for 1,20,and 300 h,the mass gain of Fe25Cr5Al alloys is 0.08,0.84,and 4.41 mg·cm^(−2),but that of Fe25Cr5Al-RE alloys is 0.03,0.35,and 0.92 mg·cm^(−2),respectively.The oxide scale of the two alloys consists ofα-Al_(2)O_(3).La and Ce promote the formation of compact and continuous oxide scale,which significantly improves the high temperature oxidation resistance of Fe25Cr5Al alloys.Moreover,RE oxide pegs can be observed at substrate/scale interface of Fe25Cr5Al-RE alloys,which makes the bond between substrate and scale tighter,thus enhancing the adhesion of the interface.There are RE oxides in oxide scale of Fe25Cr5Al-RE alloys,which effectively inhibits further oxidation of the alloys.

关 键 词：氧化机理 FE-CR-AL合金 氧化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]