SiCp增强复合钎料薄膜活性钎焊SiC陶瓷接头的微观结构及力学性能  

Microstructure and Properties of SiC Ceramic Joint Actively Brazed with SiC_p Reinforced Composite Brazing Alloy Tape

作　　者：王志平[1] 杨斯楠 刘岩[2] 丁坤英[1] 张辉[2] WANG Zhiping;YANG Sinan;LIU Yan;DING Kunying;ZHANG Hui(Tianjin Key Laboratory o{ Airworthiness and Maintenance of Civil Aircraft,Civil Aviation University of China,Tianjin 300300,China;Structural Ceramics ＆ Composites Engineering Center,Shanghai Institute of Ceramics,C.AS,Shanghai 201800,China)

机构地区：[1]中国民航大学,天津民用航空器适航与维修重点实验室,天津300300 [2]中国科学院上海硅酸盐研究所结构陶瓷与复合材料工程中心,上海201800

出　　处：《机械工程材料》2018年第10期13-17,23,共6页Materials For Mechanical Engineering

基　　金：中国民航大学天津航空器适航与维修重点实验室开放基金资助项目(2017SW05)

摘　　要：采用流延成型技术制备了不同体积分数(10%~40%)SiC_p增强Ag-Cu-Ti(SiC_p/AgCu-Ti)复合钎料薄膜,按照Ag-Cu-Ti合金箔片/(SiC_p/Ag-Cu-Ti复合钎料薄膜)/Ag-Cu-Ti合金箔片的三明治结构对SiC陶瓷进行钎焊,研究了钎焊接头的微观形貌和微区成分,测试了其室温和高温抗弯强度。结果表明:SiC_p均匀分散在钎缝金属中,其周围包裹着厚0.6~0.8μm的反应产物层;SiC陶瓷与钎缝金属结合紧密,二者之间形成了厚0.75~0.90μm的界面反应层,界面反应层主要由TiC和Ti5Si3组成;随着复合钎料薄膜中SiC_p含量的增加,接头的室温抗弯强度先略微下降再增大,当SiC_p体积分数为40%时达到最高,为301 MPa,同时其600℃高温抗弯强度达到193MPa,明显高于无SiC_p增强的普通钎焊接头的。SiCpreinforced Ag-Cu-Ti（SiCp/Ag-Cu-Ti）composite brazing alloy tapes with 10 vol%-40 vol%SiCpwere fabricated by tape casting technique,and then the SiC ceramics were brazed with the sandwich structure of Ag-Cu-Ti alloy foil/（SiCp/Ag-Cu-Ti composite brazing alloy tape）/Ag-Cu-Ti alloy foil.The microstructure and micro area composition of the brazed joint were studied,and the flexural strength at room temperature and elevated temperature were measured.The results show that the SiCp,which was coated by a layer of reaction product with thicknesses of 0.6-0.8μm,distributed uniformly in the braze metal.The SiC ceramics were tightly bonded to the braze metal.An interface reaction layer composed of TiC and Ti5 Si3 with thicknesses of 0.75-0.90μm was formed between the SiC ceramics and the braze metal.With the increase of SiCpcontent in the composite brazing alloy tape,the flexural strength at room temperature of the joint decreased slightly and then increased,and reached the maximum value of 301 MPa when the SiCpcontent was 40 vol%.In addition,the high-temperature flexural strength at 600 ℃ reached 193 MPa,which was obviously higher than that of ordinary brazed joints without SiCp reinforcement.

关 键 词：复合钎料 SiC陶瓷接头 微观结构 抗弯强度 

分 类 号：TB321[一般工业技术—材料科学与工程]