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TiAl合金与ZrB2-SiC陶瓷非晶钎焊接头组织与力学性能
王微1,王刚2,吴鹏2,徐海涛2,朱冬冬3
1.安徽机电职业技术学院航空与材料学院,芜湖 241002;2.安徽工程大学机械与汽车工程学院,芜湖 241000;3.衢州学院机械工程学院,衢州 324000
摘要:
采用Cu41.83Ti30.21Zr19.76Ni8.19(at.%)非晶钎料对Ti48Al2Cr2Nb合金与ZrB2-SiC陶瓷进行真空钎焊连接,通过扫描电镜、能谱分析、X射线衍射以及万能试验机对接头的微观组织和力学性能进行研究。结果表明:TiAl合金与ZrB2-SiC陶瓷钎焊接头的界面结构为TiAl/Ti2Al/AlCuTi/(Ti,Zr)2(Cu,Ni)+TiB+TiCu/Ti5Si3/ZS。当钎焊温度为910 ℃,随着保温时间的延长,靠近ZrB2-SiC一侧反应层宽度逐渐增大,接头中弥散分部的TiB和TiCu聚集长大。接头剪切强度随着保温时间的延长先上升后降低,当钎焊温度为910 ℃,保温20 min时,接头剪切强度最大,为187 MPa,通过对各工艺的接头断口分析,发现接头均断裂在陶瓷侧,断裂方式为脆性断裂。
关键词:  Ti48Al2Cr2Nb  ZrB2-SiC陶瓷  非晶钎料  钎焊
DOI:10.12044/j.issn.1007-2330.2020.03.009
分类号:TG454
基金项目:国家自然科学基金项目(51704001);安徽省领军骨干人才项目(Z175050020001);安徽省高校自然科学重点项目(KJ2018A0860);安徽工程大学中青年拔尖人才项目(ZQNBJ001)
Microstructure and Mechanical Properties of Brazed Joints of TiAl Alloy and ZrB2-SiC Ceramics Using Amorphous Alloy Filler
WANG Wei1, WANG Gang2, WU Peng2, XU Haitao2, ZHU Dongdong3
1.School of Aviation and Materials,Anhui Machine and Electricity College,Wuhu 241002;2.School of Mechanical and Automotive Engineering,Anhui Polytechnic University,Wuhu 241000;3.School of Mechanical Engineering,Quzhou University,Quzhou 324000
Abstract:
Ti48Al2Cr2Nb alloys and ZrB2-SiC ceramics were brazed with Cu41.83Ti30.21Zr19.76Ni8.19 (at.%) amorphous alloy filler.The microstructure and mechanical properties of the joint were analyzed by scanning electron microscopy,energy spectrometer,X-ray diffraction and testing machine.The results show that the typical joint interface structure of TiAl alloy and ZrB2-SiC ceramic brazed joint is:TiAl/Ti2Al/AlCuTi/(Ti,Zr)2(Cu,Ni)+TiB+TiCu/Ti5Si3/ZS.When the brazing temperaure is 910 ℃,the width of the reaction layer near the ZrB2-SiC side increases gradually with the increase of the holding time,and the TiB and TiCu aggregates in the diffused part of the joint grow.The joint shear strength increases first and then decreases with the increase of holding time.When the brazing temperature is 910 ℃ with holding time of 20 min, the joint shear strength reaches the maximum value of 187 MPa.Through the fracture analysis of each process,it is found that the joints are all broken on the ceramic side,and the fracture mode is brittle fracture.
Key words:  Ti48Al2Cr2Nb alloy  ZrB2-SiC ceramics  Amorphous alloy filler  Brazing