Gd掺杂La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)陶瓷材料抗V_(2)O_(5)+Na_(2)SO_(4)熔盐腐蚀行为  

Corrosion Resistance of Gd-doped La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)Ceramic Materials to V_(2)O_(5)+Na_(2)SO_(4)Molten Salts

作　　者：曲肖夫 谢敏 宋晓炜[1,2,3] 张永和 宋希文 王志刚[1,2,3] QU Xiaofu;XIE Min;SONG Xiaowei;ZHANG Yonghe;SONG Xiwen;WANG Zhigang(School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Nei Mongol,China;Inner Mongolia Key Laboratory of Advanced Ceramic Material and Devices,Baotou 014010,Nei Mongol,China;KeyLaboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources,Ministry of Education,Baotou 014010,Nei Mongol,China)

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010 [2]内蒙古自治区先进陶瓷材料与器件重点实验室,内蒙古包头014010 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古包头014010

出　　处：《硅酸盐学报》2025年第3期620-629,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(52372062,52462011);内蒙古自治区高等学校青年科技人才发展项目(NJYT23008);内蒙古自治区高等学校科学研究项目(NJZZ23055);北方稀土科研项目(BFXT-2022-D-0053);内蒙古自然科学基金项目(2024MS05021);内蒙古教育厅一流学科科研专项项目(YLXKZX-NKD-033)。

摘　　要：优异的抗熔融V_(2)O_(5)+Na_(2)SO_(4)腐蚀能力是热障涂层面层材料选择的关键性能指标。通过Gd掺杂实现了1250℃下La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)陶瓷材料抗熔融V_(2)O_(5)+Na_(2)SO_(4)腐蚀性能的提升,采用固相反应法制备了(La1-xGdx)2(Zr0.7Ce0.3)2O7(x=0、0.5)陶瓷材料,并评估了其在900~1250℃的抗熔融V_(2)O_(5)+Na_(2)SO_(4)腐蚀性能。结果表明:Gd2O3掺杂后La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)陶瓷材料各温度腐蚀深度分别下降约24%、16%、7%、7%,表现出优异的抗腐蚀性能。(La0.5Gd0.5)2(Zr0.7Ce0.3)2O7陶瓷材料优异的抗V_(2)O_(5)+Na_(2)SO_(4)腐蚀性能主要归因于晶格畸变增加引起的缓慢扩散及化学碱性的协同作用。Introduction One of the major reasons for the failure of thermal barrier coating materials is the corrosion caused by the reaction between aeroengine thermal barrier coating materials(TBC)and V_(2)O_(5)+Na_(2)SO_(4)in fuel under high-temperature service conditions.Conventional TBCs are difficult to meet the increasingly harsh high-temperature service environment.It is thus necessary to develop new and more corrosion-resistant thermal barrier coating materials.Among the materials to replace conventional TBC,La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(LZC)ceramics are considered as potential TBC candidates due to their high sintering resistance,low thermal conductivity and high thermal expansion coefficient.Also,the thermal conductivity of LZC can be effectively reduced by using Re^(3+)with large mass and small radius doping at La^(3+).Therefore,the modified(La0.5Gd0.5)2(Zr0.7Ce0.3)2O7(LGZC)doped with Gd^(3+),which is a rare-earth element and has a smaller ionic radius,can further reduce the thermal conductivity of the material and improve the mechanical properties of the material through fine-grain strengthening.However,the existing reports on the hot corrosion resistance of V_(2)O_(5)+Na_(2)SO_(4)molten salt of LZC and LGZC materials are more limited to the strong corrosive properties at<1050℃,while the actual service temperature of the coating often exceeds 1200℃.Methods In this work,ZrO_(2),La_(2)O_(3),Gd_(2)O_(3),CeO_(2) and other oxide powders were used as raw materials,and LZC and LGZC ceramic samples were prepared by a high-temperature solid-state reaction method.A typical mixed salt of V_(2)O_(5)+Na_(2)SO_(4)(in a molar ratio of 1:1)was used as a corrosive medium.V_(2)O_(5) and Na_(2)SO_(4) powders were mixed.The mixed powder was evenly spread on the surface of the ceramic sample at a concentration of 10 mg/cm^(2),and then the coated ceramic sample was placed in a box-type resistance box and treated at 900,1000,1100 and 1250℃for 5 h for thermal corrosion,respectively.The phase composition of LZC and LGZC sampl

关 键 词：热障涂层材料 锆酸镧基陶瓷材料 熔融盐腐蚀 五氧化二钒 硫酸钠 

分 类 号：TG174.4[金属学及工艺—金属表面处理]