摘要
通过X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)等手段对不同La含量的铁基耐蚀合金850℃下的抗氧化性能进行了研究。结果表明,在850℃条件下,随着稀土La含量的增加,在一定程度上降低了合金的抗氧化性能,但氧化膜与基体的粘附性却得到了大大提高。La含量增加后,促进了氧的内扩散,使内氧化层呈树枝状深入合金基体,对氧化膜起到钉固作用。氧化膜主要由3个区域组成:外层是Fe2O3与CuO混合层,并含有少量CuFe2O4;中间层是以NiFe2O4为主的保护层,并含有少量的Fe2O3、NiO;内层则是以Fe2O3为主并含有少量NiO氧化物的内氧化区。
Oxidation resistance of Fe-base corrosion resistant alloys with different La content at 850℃was studied by using XRD,SEM and EDS techniques.The results show that at 850℃,with the increase of La content,the anti-oxidation property of the alloy is reduced to a certain extent,but the adhesion of the oxide film to the matrix is greatly improved.The oxide film can be fixed on the alloy matrix tightly with the increase of La content by promoting the internal diffusion of oxygen and make the inner oxide layer become dendritic and go deep into the alloy matrix.The oxide film is mainly composed of three layers:the outer layer is the mixed layer of Fe2O3 and CuO,and contains a small amount of NiFe2O4;the middle layer is a protective layer dominated by NiFe2O4,and contains a small amount of Fe2O3 and NiO;the inner layer is an inner oxidation zone dominated by Fe2O3 and contains a small amount of NiO oxide.
作者
李冬生
柴登鹏
侯光辉
李致远
刘英
刘丹
Li Dongsheng;Chai Dengpeng;Hou Guanghui;Li Zhiyuan;Liu Ying;Liu Dan(Zhengzhou Non-ferrous Metals Research Institute Co.,Ltd.,of CHALCO,Zhengzhou Henan 450041,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第7期148-152,共5页
Heat Treatment of Metals
关键词
稀土La
铁基耐蚀合金
高温氧化
氧化膜
rare earth La
Fe-based corrosion resistant alloy
high temperature oxidation
oxide film
