氧化铝–氧化锆预应力陶瓷的抗钙镁铝硅酸盐腐蚀性能  

Corrosion Resistance of Alumina Zirconia Prestressed Ceramics to Calcium Magnesium Aluminosilicate

作　　者：张旭阳 王秀芳 万德田 李海燕[3,4] 包亦望 贾志杰 马华超[3,4] ZHANG Xiyang;WANG Xinfang;WAN Detian;LI Haiyan;BAO Yiwang;JIA Zhijie;MA Huachao(School of Civil and Transportation Engineering,Beijing University of Civil engineering and Architecture,Beijing 102616,China;Beijing Key Laboratory of Building Structure and Environmental Restoration Functional Materials,School of Science,Beijing University of Civil engineering and Architecture,Beijing 102616,China;China National Inspection and Testing Holding Group Co.,Ltd.,Beijing 100024,China;State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京102616 [2]北京建筑大学理学院,建筑结构与环境修复功能材料北京市重点实验室,北京102616 [3]中国国检测试控股集团股份有限公司,北京100024 [4]绿色建材国家重点实验室,中国建筑材料科学研究总院,北京100024

出　　处：《硅酸盐学报》2024年第12期3815-3823,共9页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2021YFB3702300);国家自然科学基金(52032011,52072356,51808025);北京建筑大学金字塔人才培养工程(JDYC20200329)。

摘　　要：氧化锆(ZrO_(2))陶瓷因其优异的性能常被用于航空发动机高温部件,然而在服役过程中常面临钙镁铝硅酸盐(CMAS)腐蚀,严重影响其服役寿命。为减缓CMAS对陶瓷构件的腐蚀,采用预应力增强的方法在ZrO_(2)陶瓷表层引入一层含压应力的氧化铝(Al_(2)O_(3))涂层,形成ZrO_(2)基体的Al_(2)O_(3)–ZrO_(2)预应力陶瓷,为研究其对CMAS腐蚀的抑制作用,通过选用ZrO_(2)陶瓷为参照样,研究了不同服役温度下CMAS渗透和腐蚀反应机理。结果表明,Al_(2)O_(3)–ZrO_(2)预应力陶瓷抵抗CMAS腐蚀效果显著优于ZrO_(2),这主要归因于2点:1)高温下CMAS与Al_(2)O_(3)涂层发生了反应,生成了高熔点化合物钙长石(CaAl_(2)Si_(2)O_(8))、尖晶石(MgAl_(2)O_(4))和少量的钙铝黄长石(Ca_(2)Al_(2)Si O_(7)),从而有利于阻止CMAS熔体渗透;2)表层的压应力能够抑制裂纹的扩展,从而阻碍了通过裂纹进入的氧化深入效应,提高ZrO_(2)陶瓷构件在CMAS腐蚀环境下的使用寿命。Introduction Zirconium dioxide(ZrO_(2))ceramics have superior properties such as high hardness,high thermal expansion coefficient and low thermal conductivity,which are widely used in high-temperature components like aircraft engines,gas turbines and combustion power plants.However,ZrO_(2)ceramics in the use can be CMAS(i.e.,CaO,MgO,Al_(2)O_(3)and SiO_(2))and other small particles corrosion,resulting in the decrease of ZrO_(2)ceramics performance.The problem of CMAS corrosion becomes a challenge.The technologies used to protect the CMAS corrosion of ZrO_(2)ceramics are the use of a non-permeable protective layer,the use of a top layer of laser glazing treatment,a thermal spray nanostructure coating and a rare-earth co-doped coating.Although these methods have a certain anti-CMAS corrosion effect,they still have some shortcomings of complex preparation process and high cost.To further investigate and improve the high-temperature corrosion resistance of ZrO_(2)ceramics,Al_(2)O_(3)-ZrO_(2)prestressed ceramics were prepared with Al_(2)O_(3)as a coating and ZrO_(2)as a matrix.The flexural strength at different temperatures and the behavior of CMAS penetration and element diffusion were investigated via comparative analysis of Al_(2)O_(3)–ZrO_(2)prestressed ceramics and ZrO_(2)ceramics.The effect of prestressed enhancement,the CMAS penetration and the corrosion mechanism of Al_(2)O_(3)-ZrO_(2)prestressed ceramics against CMAS at a high temperature were analyzed.Methods The thermal corrosion experiment was carried out in a high-temperature sintering furnace.The samples of ZrO_(2)ceramics and Al_(2)O_(3)–ZrO_(2)prestressed ceramics with CMAS powder were heated at different temperatures(i.e.,1200,1250,1300,1350℃and 1400℃),respectively,for 10 h,and then cooled in the furnace.In the analysis of corrosion resistance of ZrO_(2)ceramics and Al_(2)O_(3)–ZrO_(2)prestressed ceramics,the mechanical properties of ZrO_(2)ceramics and Al_(2)O_(3)–ZrO_(2)prestressed ceramics before and after corrosion were tested by a mode

关 键 词：钙镁铝硅酸盐腐蚀 预应力陶瓷 弯曲强度 腐蚀机理 

分 类 号：TQ174[化学工程—陶瓷工业]