SiC_(f)/SiC与GH5188钎焊接头的界面产物及机制研究  

Microstructure and Mechanism of SiC_(f)/SiC and GH5188 Brazed Joints

作　　者：杨佳[1] 徐新 何鹏[1] 林铁松[1] 林盼盼[1] 庄艳丽[2] V.Savitsky K.Shyian Yang Jia;Xu Xin;He Peng;Lin Tiesong;Lin Panpan;Zhuang Yani;V.Savitsky;K.Shyian(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Heilongjiang Provincial Key Laboratory of CO_(2) Resource Utilization and Energy Catalytic Materials,School of Ma-terial Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;EO.Paton Electric Welding Institute of NASU,GSP Kyiv 03680,Ukraine)

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]哈尔滨理工大学材料科学与化学工程学院,黑龙江省CO_(2)资源化利用与能源催化材料重点实验室,黑龙江哈尔滨150040 [3]乌克兰国家科学院巴顿焊接研究所,乌克兰基辅市03680

出　　处：《稀有金属》2023年第5期769-777,共9页Chinese Journal of Rare Metals

基　　金：中国-乌克兰材料连接与先进制造“一带一路”联合实验室建设与联合研究项目(2020YFE0205300);国家磁约束核聚变能发展研究专项(2019YFE03100100);国家自然科学基金项目(51974101,51975150,U21A20128,52105332);黑龙江省自然科学基金项目(JQ2020E003)资助。

摘　　要：使用CuTi+NbB_(2)活性钎料成功实现了碳化硅纤维增强碳化硅(SiC_(f)/SiC)复合材料与GH5188钴基高温合金二者的连接,研究了钎焊温度对接头界面微观组织以及力学性能的影响,并对连接机制展开了分析。接头典型的界面结构为GH5188/Cu+(Ni,Co,Cu)3Ti_(2)+(Co,Ni,Cu)Ti_(2)/Cu_(4)Ti/Cu+Cu_(3)Ti_(2)+(Ni,Co)-Si+(Ni,Co,Cu)Ti_(2)/TiC+Cr-C/SiC+Cu/SiC_(f)/SiC。由于NbB2粉末的引入,导致形核点的增加,金属间化合物倾向于以小颗粒相的形态析出并弥散分布在钎缝中。而随着温度的升高,金属的溶解情况以及元素的互扩散以及反应情况均有所加强,但温度的改变基本上不改变各层的占比;同时,陶瓷侧的补充活性元素(Co,Cr,Ni)随着温度而增多,这在一定程度上有利于陶瓷与焊缝之间的连接。因此,在1050℃/10 min的情况下,接头的室温抗剪强度最高达到72 MPa。接头均沿钎缝和SiC_(f)/SiC复合材料的反应界面断裂。Cu-25%Ti featured with good affinity with the ceramics,good plasticity and toughness,was used as the solder matrix,and NbB_(2) particles were used as the reinforcing phase.The brazing of silicon carbide fiber reinforced silicon carbide(SiC_(f)/SiC)composite and Co-based superalloy GH5188 was successfully fulfilled by using this composite filler.The parameter window was optimized by ad-justing the brazing temperatures,which was beneficial to solving the problems commonly faced by ceramic materials at present,that was,problems such as poor workability,small size,and limited application range caused by their own brittleness.The typical inter-face structure of the joint was GH5188/Cu+(Ni,Co,Cu)_(3)Ti_(2+)(Co,Ni,Cu)Ti_(2)/Cu_(4)Ti/Cu+Cu_(3)Ti_(2+)(Ni,Co)-Si+(Ni,Co,Cu)Ti_(2)/TiC+CrC/SiC+Cu/SiC_(f)/SiC.In the brazing process,NbB_(2) and TiC tended to serve as nucleation sites for the subsequently precipitated by inter-metallic compounds and silicide,which was beneficial to improve the mechanical properties such as the yield strength of the seam without excessively destroying the stress-relieving ability of the plastic matrix.The influence of temperatures on the dissimilar joints was investigated and several conclusions could be drawn:First,there was no obvious defect at the interface of any parameters.The mi-crostructure of the joint was similar,which was composed of Cu solid solution matrix and dispersed dark gray particles.And the change of temperature did not change the proportion of each layer.Second,with the increase in temperature,the dissolution of metal,the in-terdiffusion of elements,and the reaction were enhanced,which provided more Ni,Cr and Co elements for the region near ceramics.As a result,the dark gray phases on the ceramic side gradually grew,and the intermetallic compound close to SiC ceramic could be ob-served,which was beneficial to the joining between the ceramic and the seam region to a certain extent.The reaction mechanism was deduced as follows.When the temperature increased to 875℃,the eutecti

关 键 词：钴基高温合金 碳化硅纤维增强碳化硅(SiC_(f)/SiC)复合材料 活性钎焊 界面组织 连接机制 

分 类 号：TF803.21[冶金工程—有色金属冶金]