Effect of brazing parameters on microstructure and mechanical properties of Cf/SiC and Nb-1Zr joints brazed with Ti-Co-Nb filler alloy |
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| Affiliation: | 1. Materials Science Division, India;2. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400085, India;3. Indian Institute of Technology Bombay, Mumbai 400076, India;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;1. Materials Processing Division, Trombay, Mumbai 400085, India;2. Materials Group of Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Shandong Provincial Key Lab of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;1. Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, PR China;2. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, PR China |
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| Abstract: | Reliable brazing of carbon fiber reinforced SiC (Cf/SiC) composite to Nb-1Zr alloy was achieved by adopting a novel Ti45Co45Nb10 (at.%) filler alloy. The effects of brazing temperature (1270–1320 °C) and holding time (5–30 min) on the microstructure and mechanical properties of the joints were investigated. The results show that a continuous reaction layer (Ti,Nb)C was formed at the Cf/SiC/braze interface. A TiCo and Nb(s,s) eutectic structure was observed in the brazing seam, in which some CoNb4Si phases were distributed. By increasing the brazing temperature or extending the holding time, the reaction layer became thicker and the amount of the CoNb4Si increased. The optimized average shear strength of 242 MPa was obtained when the joints were brazed at 1280 °C for 10 min. The high temperature shear strength of the joints reached 202 MPa and 135 MPa at 800 °C and 1000 °C, respectively. |
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| Keywords: | Brazing Ti-Co-Nb filler alloy Microstructure evolution Mechanical properties |
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