SiC_(f)/SiC包壳管和Kovar合金钎焊接头的组织及力学性能研究  

Study on microstructure and mechanical properties of brazed joints of SiC_(f)/SiC clad tubes and Kovar alloys

作　　者：高笑语 姬雄帅 张华锋 赵建国 牛凤姣 黄建源 郭亚杰[1] GAO Xiaoyu;JI Xiongshuai;ZHANG Huafeng;ZHAO Jianguo;NIU Fengjiao;HUANG Jianyuan;GUO Yajie(School of Materials Science and Engineering,Chang′an University,Xi′an 710064,China;SPIC Science and Technology Research Institute,Beijing 102209,China;Modern Engineering Training Center,Chang′an University,Xi′an 710064,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]国家电投集团科学技术研究院有限公司,北京102209 [3]长安大学现代工程训练中心,陕西西安710064

出　　处：《兵器材料科学与工程》2024年第5期13-17,共5页Ordnance Material Science and Engineering

基　　金：陕西省重点研发计划(2024GX-YBXM-352);国家自然科学基金(52101007);西安市重点产业链关键核心技术攻关(23LLRH0004);西安市先进制造业技术攻关(2021JH-06-0047)。

摘　　要：碳化硅纤维增强碳化硅复合材料(SiC_(f)/SiC)具有较低的水蒸气化学活性、低中子吸收截面和高损伤耐受性,被视为理想的核用包壳材料。钎焊是实现SiC_(f)/SiC包壳管和Kovar合金端塞连接的重要工艺。本文用Ag-34.5Cu-3Ti钎料完成了SiC_(f)/SiC包壳管与Kovar合金端塞的钎焊。结果表明:钎焊温度为880℃、保温时间为30 min时,钎焊焊缝组织致密,无明显缺陷。焊缝组织主要为Ag-Cu共晶,界面反应层的主要相组成为TiC和Fe2Si。钎焊接头的抗剪切强度达到了41.2 MPa。Silicon carbide fiber reinforced silicon carbide composites(SiC_(f)/SiC)are considered as ideal nuclear cladding materials due to their low water vapor chemical activity,low neutron absorption cross section and high damage tolerance.Brazing is an important process for connecting SiC_(f)/SiC clad tube and Kovar alloy end plug.In this paper,the brazing of SiC_(f)/SiC clad tube and Kovar alloy end plug was completed with Ag-34.5Cu-3Ti filler metal.The results show that when the brazing temperature is 880℃and the holding time is 30 min,the brazing weld has dense microstructure and no obvious defects.The weld microstructure is mainly Ag-Cu eutectic,and the main phase composition of the interface reaction layer is TiC and Fe2Si.The shear strength of the brazed joint reaches 41.2 MPa.

关 键 词：SiC_(f)/SiC包壳管 Kovar合金 AgCuTi钎料 

分 类 号：TG454[金属学及工艺—焊接]