钛基钎料高温钎焊TZM界面行为及热稳定性研究  

Interfacial Behavior and Thermostability of the TZM High Temperature Brazing Seam with Ti-based Brazing Filler Metals

作　　者：路全彬 钟素娟 李胜男 张雷[1] 裴夤崟 龙伟民 Lu Quanbin;Zhong Sujuan;Li Shengnan;Zhang Lei;Pei Yinyin;Long Weimin(State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China;Tsinghua University,Beijing 100084,China)

机构地区：[1]郑州机械研究所有限公司新型钎焊材料与技术国家_重点实验室,河南郑州450001 [2]清华大学,北京100084

出　　处：《稀有金属材料与工程》2020年第3期849-856,共8页Rare Metal Materials and Engineering

基　　金：International S&T Cooperation Program of China(2016YFE0201300);Science and Technology Innovation Talents Program of Henan Province(174200510010)。

摘　　要：采用Ti-8.5Si、Ti-33Cr和Ti-30V-3Mo钎料实现了钛锆钼(TZM)合金的高温真空钎焊连接,借助SEM、EDS及润湿性试验和抗剪试验等分析方法,研究了钛基钎料高温钎焊TZM及钎焊接头经高温热循环后的热稳定性。结果表明,Ti-8.5Si、Ti-33Cr在1520oC/6min的工艺条件下良好润湿TZM,润湿角分别为10o和9o,Ti-8.5Si钎料的铺展面积大于Ti-33Cr钎料的铺展面积,Ti-30V-3Mo钎料在1680oC/8 min的条件下在TZM板上的润湿角为5°。Ti-8.5Si/TZM接头界面形成(Ti, Mo)固溶体,钎缝中心由(Ti, Mo)固溶体和Ti5Si3相组成。Ti-33Cr/TZM接头界面形成(Ti,Mo)固溶体,钎缝中心由(βTi,Cr)固溶体和αTi+(αTi+αTi Cr2)共晶组成。Ti-30V-3Mo/TZM接头,钎缝区主要由(βTi, V)固溶体和αTi组成,界面区由Ti与Mo形成(Ti,Mo)固溶体。3种钎料钎焊TZM,均形成固溶体钎焊接头而实现钎料与TZM的冶金结合,钎焊接头强度分别为135.8 MPa(Ti-8.5Si)、132 MPa(Ti-33Cr)和131 MPa(Ti-30V-3Mo)。Ti-8.5Si/TZM、Ti-33Cr/TZM接头经过1200oC/60min没有观察到明显的晶间渗入和母材溶蚀,界面固溶体结合形式无变化。Ti-30V-3Mo/TZM接头经过1550oC/60 min热循环后,观察到1个晶粒深度的晶间腐蚀,没有明显的母材溶蚀现象,且界面依然保持固溶体结合形式。3种钛基钎料可实现TZM的高温钎焊,依靠界面固溶体实现冶金结合,经高温长时间热循环后钎焊接头组织性能稳定,发生晶间渗入敏感性低,为TZM的高温应用连接提供理论与试验指导。The high-temperature vacuum brazing of Titanium-Zirconium-Molybdenum(TZM) alloys was efficiently realized while using the Ti-8.5 Si, Ti-33 Cr and Ti-30 V-3 Mo brazing filler metals, separately. The thermostability of the brazing joint interface after high temperature thermal cycle was studied by SEM, EDS, wettability test and shearing test, etc, and so as to the thermostability of the brazing process. The results show that, under the technological parameter of 1520 oC/6 min, both Ti-8.5 Si and Ti-33 Cr brazing filler metals have good wettability on the surface of TZM alloy, whose wetting angle is 10° and 9°, respectively. The spreading area of Ti-8.5 Si brazing filler metal is larger than that of the Ti-33 Cr brazing filler metal. Under the technological parameter of 1680 oC/8 min, the Ti-30 V-3 Mo brazing filler metal has a 5° wetting angle on the surface of the TZM alloy. The(Ti, Mo) solid solution is formed in the interfaces of the Ti-8.5 Si/TZM and the Ti-33 Cr/TZM brazing joints. The center of the Ti-8.5 Si/TZM brazing seam is composed of(Ti, Mo) solid solution and Ti5Si3 phase. The center of the Ti-33 Cr/TZM brazing seam is composed of(βTi, Cr) solid solution and the αTi +(αTi+αTiCr2) eutectic. The brazing seam of the Ti-30 V-3 Mo/TZM joint is composed of(βTi, V) solid solution and the αTi phase, and the boundary zone is composed of(Ti, Mo) solid solution. They all form solid solutions in the brazing joints to realize the metallurgical bonding between the brazing filler metals and the TZM alloys when using these three kinds of brazing filler metals. The shear strengths of the brazing joints are 135.8 MPa(Ti-8.5 Si), 132 MPa(Ti-33 Cr) and 131 MPa(Ti-30 V-3 Mo). There are no obvious intergranular infiltration and parent metal dissolution phenomena in the Ti-8.5 Si/TZM and Ti-33 Cr/TZM brazing joints after the 1200 oC/60 min thermal cycle treatment, and the boundary zone is still combined by the solid solution. In the Ti-30 V-3 Mo/TZM brazing joint after 1550 oC/60 min thermal cycle, there is intergra

关 键 词：钛锆钼合金 高温钎焊 钛基钎料 晶间渗入 热稳定性 

分 类 号：TG454[金属学及工艺—焊接]