Blast and tensile properties of tantalum/niobium lined SiC/SiC composite tubes for nuclear cladding  

核用钽/铌内衬SiC/SiC复合材料管件的拉伸与耐压性能

作　　者：Chang LI Hong-lei WANG Ya-ping YANG Quan-chao GU Xing-heng YAN Xin-gui ZHOU 黎畅;王洪磊;杨雅萍;顾全超;闫星亨;周新贵(国防科技大学空天科学学院先进陶瓷纤维及其复合材料重点实验室,长沙410073)

机构地区：[1]Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第6期1961-1968,共8页中国有色金属学报（英文版）

基　　金：supported by the National Key R&D Program of China (No. 2018YFB1900603);the Natural Science Foundation of Hunan Province, China (No. 2020JJ4667)。

摘　　要：The mechanical performances such as tensile strength and blast property of metal lined SiC/SiC composite cladding tubes were investigated. Nb or Ta was selected as liner material, and the SiC/SiC composite layer was fabricated by winding and different precursor impregnation and pyrolysis(PIP) processes. The tensile strengths of different tube samples were measured at room temperature(RT) and 1200 °C, respectively. The blast property was investigated through the maximum water pressure of tubes. And the fracture microstructures were observed by SEM.The highest tensile strength at RT was 150.7 MPa. The blast strength was enhanced with the PIP process increasing from 1 to 4 cycles and the tube of 4 PIP cycles had the highest water pressure of 34.7 MPa. Compared with the metal tubes, the multi-layer structure improved tensile and blast properties significantly. The different processes such as PIP cycles and pyrolytic carbon(PyC) coating were important factors to enhance the mechanical performances of SiC/SiC-based tubes. However, the retention rate of tensile strength was only 18.5% at 1200 °C.研究金属内衬的SiC/SiC复合材料管件的抗拉强度和爆炸特性等力学性能。采用铌或钽为内衬层,通过缠绕及不同的PIP工艺制备一系列SiC/SiC复合材料管件。在室温与1200℃下测量不同管件的抗拉强度,通过测量最大耐水压强度表征管件的爆炸特性,并利用扫描电镜观察断口显微形貌。结果发现,室温下金属内衬SiC/SiC复合材料管件的最大抗拉强度可达150.7 MPa;随着PIP周期从1增加到4,管件的爆炸性能增加,4个PIP周期的管件最大耐水压强度可达34.7 MPa。与单层结构的金属管件相比,由SiC/SiC复合材料层与金属内衬结合的管件具有更好的拉伸与耐压性能。PIP周期与热解炭涂层等不同工艺是提升金属内衬SiC/SiC复合材料管件力学性能的重要因素。然而,在1200℃时管件的抗拉强度保留率仅为18.5%。

关 键 词：SiC/SiC composite tantalum/niobium liner tensile strength blast property 

分 类 号：TB332[一般工业技术—材料科学与工程]