TZM/graphite interface behavior in high-temperature brazing by Ti-based brazing filler materials
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RESEARCH PAPER
TZM/graphite interface behavior in high-temperature brazing by Ti-based brazing filler materials Quanbin Lu 1 & Weimin Long 1 & Sujuan Zhong 1 & Jian Qin 1 & Yongtao Jiu 1 & Huawei Sun 1 Received: 30 August 2019 / Accepted: 15 July 2020 # International Institute of Welding 2020
Abstract Graphite was successfully brazed to TZM alloy using the Ti-56Ni, Ti-8.5Si, Ti-33Cr and Ti-30V-3Mo brazing filler materials, respectively, and the corresponding brazing temperatures ranged from 1300 to 1700 °C. The results show that the microstructure of TZM/graphite braze metal was composed of NiTi and Ni3Ti compounds when using Ti-56Ni brazing filler, and the discontinuous TiC compounds were found at the Ti-56Ni/graphite side. When using the Ti-8.5Si, Ti-33Cr and Ti-30V-Mo brazing fillers, the metallurgical combination was obtained due to the formation of the Ti-Mo solid solution at the TZM/brazing filler side and the TiC reaction layer at the graphite/brazing filler side. The fracture was occurred at the interface of TiC/graphite during shear test, which indicated the poorer bonding strength between the graphite and granular TiC. Keywords Graphite . TZM alloys . High-temperature brazing . Titanium-based brazing filler . Interface microstructure
1 Introduction Graphite is an excellent high-temperature-resistant material due to its sublimation temperature at 3747 ± 50 °C under normal pressure. Graphite also shows many advantages, such as high electrical conductivity, thermal conductivity and chemical stability. However, its tensile strength is poor, which limits its application in structural components. Realizing the connection between graphite and metals is a potential method for applying in complex structure, which can take advantage of its comprehensive properties [1, 2]. Brazing is an effective method to get the above-mentioned dissimilar joining, and the well connection interface. Dong et al. [3] studied the brazing of graphite/molybdenum using Ti-Zr brazing fillers. Mao et al. [4] and Zhang et al. [5] studied the effects of brazing fillers composition and brazing temperature on the reaction behavior of graphite/copper and properties of copper alloy
Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding * Weimin Long [email protected] 1
State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering Co., LTD, Zhengzhou 450001, China
brazed joints. He et al. [6] found that the graphite was successfully joined to Hastelloy N alloy by using Au foil at 980 °C, 1020 °C, 1060 °C and 1100 °C for 0.5 h, respectively. Yu et al. reported that a low-temperature brazed joint of aluminum to graphite was obtained by using Sn-Ag-Ti solder foil in ultrasonic vibration-assisted environment [7]. Molybdenum alloys can be used in many fields such as aerospace, electronics and nuclear industries due to their high melting point, good mechanical properties at high temperature and excellent electrical and thermal conductivit
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