Al_(2)O_(3)-Ce_(2)O_(3)复合薄膜对304不锈钢抗高温氧化性能的影响  

Effect of Al_(2)O_(3)-Ce_(2)O_(3) Composite Film on High Temperature Oxidation Resistance of 304 Stainless Steel

作　　者：马静[1,2] 王铁凝 姜秋月 冯志浩 张欣 李建辉[1] MA Jing;WANG Tiening;JIANG Qiuyue;FENG Zhihao;ZHANG Xin;LI Jianhui(Hebei Short Process Steelmaking Technology Innovation Center,School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Hebei Oil and Gas Drilling and Production Casing Head and Oil Extraction Equipment Technology Innovation Center,Hengshui 053300,China)

机构地区：[1]河北科技大学材料科学与工程学院河北短流程炼钢技术创新中心,河北石家庄050018 [2]河北省油气钻采套管头与采油树装备技术创新中心,河北衡水053300

出　　处：《材料保护》2024年第10期19-26,共8页Materials Protection

基　　金：国家自然科学基金青年项目(52001109)。

摘　　要：为提高304不锈钢的抗高温氧化性能,采用溶胶-凝胶法以异丙醇铝和CeCl_3·7H_(2)O为原料,在304不锈钢表面分别制备了Al_(2)O_(3)薄膜和Al_(2)O_(3)-Ce_(2)O_(3)复合薄膜,通过氧化动力学曲线、XRD、SEM和EDS分析,研究了不同Ce/Al比例(摩尔比,下同)的Al_(2)O_(3)-Ce_(2)O_(3)复合薄膜对304不锈钢900℃抗高温氧化性能的影响。结果表明,涂覆Ce∶Al=1∶10的薄膜试样在900℃循环氧化100 h后的氧化增重与氧化剥落量仅为未涂覆试样的34.1%和51.8%,抗高温氧化性能最佳。Al_(2)O_(3)-Ce_(2)O_(3)复合薄膜降低了304不锈钢基体表面的氧分压,有利于生成保护性的Cr_2O_(3)氧化层,有效抑制了Cr_2O_(3)的挥发;添加Ce_(2)O_(3)降低了氧化层中的热应力,提高了其附着力;Ce_(2)O_(3)起到了活性元素效应,改变了氧化膜的生长机制,因此显著提高了不锈钢的抗高温氧化性能。In order to improve the high temperature oxidation resistance of 304 stainless steel,Al2 O3 thin films and Al2 O3-Ce2 O3 composite films were respectively prepared on the surface of 304 stainless steel by sol-gel method using aluminum isopropyl alcohol and CeCl37H2O as raw materials.The effect of Al_(2)O_(3)-Ce_(2)O_(3) composite films with different Ce/Al ratios(molar ratios,the same below)on the high-temperature oxidation resistance of 304 stainless steel at 900℃was studied through oxidation kinetics curves,XRD,SEM,and EDS analysis.Results showed that the weight gain and spalling values of the Al_(2)O_(3)-Ce_(2)O_(3) film coated with Ce∶Al=1∶10 were only 34.1%and 51.8%of those of the uncoated steel after cyclic oxidation at 900℃for 100 h,showing the optimal high temperature oxidation resistance.The Al2 O3-Ce2 O3 composite film reduced the oxygen partial pressure on the substrate surface of 304 stainless steel,which facilitated the formation of a protective Cr2O3 oxide layer and effectively suppressed the volatilization of Cr2O3.Furthermore,the addition of Ce2 O3 reduced the thermal stress in the oxide scale and improved its adhesion to the substrate.Ce_(2)O_(3) played an active element effect and changed the growth mechanism of oxide scale,so the high temperature oxidation resistance of composite film was significantly improved.

关 键 词：溶胶-凝胶法 Al_(2)O_(3)-Ce_(2)O_(3)复合薄膜 高温氧化 活性元素效应 

分 类 号：TG174.32[金属学及工艺—金属表面处理]