耐亚临界水腐蚀Zr掺杂Ti3SiC2陶瓷的性能  

Subcritical water corrosion resistance of Zr-doped Ti3SiC2 ceramics

作　　者：董君鹏 杨秋红[1] 邹宇琦[2] 张兆泉[2] 范武刚[2] DONG Junpeng;YANG Qiuhong;ZOU Yuqi;ZHANG Zhaoquan;FANWugang(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]中国科学院上海硅酸盐研究所,上海201899

出　　处：《辐射研究与辐射工艺学报》2020年第3期68-76,共9页Journal of Radiation Research and Radiation Processing

基　　金：国家重大专项(2017ZX06002004);中国科学院重点部署项目(ZDRW-CN-2017-1)资助。

摘　　要：采用热压法合成了掺Zr的MAX相(Ti(1-x)Zrx)3SiC2陶瓷(纯度约97%,杂质为TiC),以提高Ti3SiC2的耐亚临界水腐蚀性能。去离子水中360℃条件下腐蚀后,在(Ti(1-x)Zrx)3SiC2陶瓷表面形成钝化的腐蚀层,外层为TiO2,内层为TiO2和ZrO2组成的混合物。随着Zr掺杂量的增加,(Ti(1-x)Zrx)3SiC2陶瓷表面腐蚀氧化层越来越薄,当Zr掺杂量为15%(物质的量百分数)时,(Ti(1-x)Zrx)3SiC2陶瓷的质量变化最小,腐蚀后氧化膜的厚度最薄。经过200 h腐蚀后,厚度为12μm,Zr含量为15%时,力学性能和热学性能指标最好,致密度最高达到了97.98%,Ti3SiC2陶瓷的硬度为3.2 GPa,抗弯强度为(479.673±10.012)GPa,热导率为33.93W/(m∙K)。A Zr-doped MAX phase(Ti(1-x)Zr)3SiC2 ceramic(with a purity of approximately 97% and impurities of TiC)was synthesized using hot pressing to improve the subcritical water corrosion resistance of Ti3SiC2.After corrosion in deionized water at 360℃ and 18 MPa,a passivated corrosion layer was formed on the surface of the(Ti(1-x)Zrx)3SiC2 ceramic.The outer layer consisted of TiO2 and thexinner layer was a mixture of TiO2 and ZrO2.As Zr doping increased,the corrosion oxide layer on the surface of the (Ti(1-x)Zrx)3SiC2 ceramic became thinner.When the Zr doping was 15%,the change in quality of(Ti(1-x)Zrx)3SiC2ceramic was the smallest and the oxide film the thinnest after corrosion;the thickness of the oxide film was 12μm after 200 h of corrosion.At 15%Zr doping,the mechanical and thermal properties were excellent.The hardness,bending strength,and thermal conductivity of Ti3SiC2 ceramic are 3.2 GPa,(479.673±10.012)GPa,and 33.93 W/(m·K),respectively.

关 键 词：掺杂 TI3SIC2 亚临界水 耐腐蚀性 热膨胀系数 热导率 

分 类 号：TL13[核科学技术—核能科学]