机械合金化+放电等子烧结FeCrAl/La_(2)Zr_(2)O_(7)复合材料高温氧化行为研究  

High Temperature Oxidation Behavior of FeCrAl/La_(2)Zr_(2)O_(7) Composites Prepared by Mechanical Alloying and Spark Plasma Sintering

作　　者：张帮彦 吴洪斌 胡雪刚 董家键 郑世杰 尹蔚蔚 张方宇 田礼熙 刘光明[1] ZHANG Bangyan;WU Hongbin;HU Xuegang;DONG Jiajian;ZHENG Shijie;YIN Weiwei;ZHANG Fangyu;TIAN Lixi;LIU Guangming(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《中国腐蚀与防护学报》2024年第4期965-971,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51901097);江西省自然科学基金(20212BAB214036)。

摘　　要：采用机械合金化+放电等离子烧结技术制备了Fe-Cr-x Al/La_(2)Zr_(2)O_(7)(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-Al_(2)O_(3);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-Al_(2)O_(3),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-Al_(2)O_(3)逐渐转变为α-Al_(2)O_(3),3种复合材料氧化行为接近。Composite materials with different Al content Fe-Cr-xAl/La_(2)Zr_(2)O_(7)(x=4,8 and 10,mass fraction,%)were prepared by mechanical alloying and spark plasma sintering technique.Then the oxidation behavior of the composite materials in air at 1000oC is studied via mass change measurement,scanning 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 stableα-Al_(2)O_(3) with slow growth rate.On the composite containing 8%Al,metastableθ-Al_(2)O_(3) 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 content,the more the FeAl phase precipitated and the obvious higher the oxidation acceleration.With the prolonging oxidation time,θ-Al_(2)O_(3) gradually transforms intoα-Al_(2)O_(3),and the oxidation behavior of the three composite materials is similar.The results of this study may provide a reliable reference for the development of the perforated head of long-life and high-reliability for making seamless steel pipes.

关 键 词：FeCrAl/La_(2)Zr_(2)O_(7)复合材料 穿孔顶头 高温氧化 氧化动力学 

分 类 号：TB37[一般工业技术—材料科学与工程]