机械合金化+放电等子烧结FeCrAl/La2Zr2O7复合材料高温氧化行为研究
High Temperature Oxidation Behavior of FeCrAl/La2Zr2O7 Composites Prepared by Mechanical Alloying and Spark Plasma Sintering
张帮彦 1吴洪斌 1胡雪刚 1董家键 1郑世杰 1尹蔚蔚 1张方宇 1田礼熙 1刘光明1
作者信息
- 1. 南昌航空大学材料科学与工程学院 南昌 330063
- 折叠
摘要
采用机械合金化+放电等离子烧结技术制备了Fe-Cr-xAl/La2Zr2O7(x=4、8和10,质量分数,％)复合材料,结合扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和氧化增重等方法研究了复合材料中Al含量对其高温氧化行为的影响.结果表明:氧化初期,复合材料氧化速率随着Al含量的升高而逐渐增大,而氧化稳定阶段3种复合材料氧化速率接近;氧化过程中,含Al量为4％的复合材料氧化产物保持为生长缓慢的稳定α-Al2O3;含Al量为8％和10％的复合材料中析出了 FeAl相,使其表面在氧化初期产生生长较快的亚稳θ-Al2O3,加快了氧化,且含Al量越高则析出的FeAl相越多,氧化加速越明显;氧化时间延长后,θ-Al2O3逐渐转变为α-Al2O3,3种复合材料氧化行为接近.
Abstract
Composite materials with different Al content Fe-Cr-xAl/La2Zr2O7(x=4,8 and 10,mass fraction,％)were prepared by mechanical alloying and spark plasma sintering technique.Then the oxida-tion behavior of the composite materials in air at 1000℃ is studied via mass change measurement,scan-ning electron microscope(SEM),energy dispersive spectroscope(EDS)and X-ray diffractometer(XRD).The results show that in the initial oxidation stage,the oxidation rate of the composite materials gradually increases with the increase of Al content.However,in the stable oxidation stage,the oxidation rates of the three composite materials are similar to each other.During the oxidation process,the formed oxide scale on the composite containing 4％Al remains as stable α-Al2O3 with slow growth rate.On the compos-ite containing 8％Al,metastable θ-Al2O3 with faster growth rate is generated on the surface while FeAl phase is precipitated in the initial oxidation stage,which accelerates the oxidation.The higher the Al con-tent,the more the FeAl phase precipitated and the obvious higher the oxidation acceleration.With the prolonging oxidation time,θ-Al2O3 gradually transforms into α-Al2O3,and the oxidation behavior of the three composite materials is similar.The results of this study may provide a reliable reference for the de-velopment of the perforated head of long-life and high-reliability for making seamless steel pipes.
关键词
FeCrAl/La2Zr2O7复合材料/穿孔顶头/高温氧化/氧化动力学Key words
FeCrAl/La2Zr2O7 composites/perforated head/high temperature oxidation/oxidation kinetics引用本文复制引用
基金项目
国家自然科学基金(51901097)
江西省自然科学基金(20212BAB214036)
出版年
2024
NETL
NSTL
万方数据