Cu + TiB2 composite filler for brazing Al2O3 and Ti-6Al-4V alloy |
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Authors: | Minxuan YangTiesong Lin Peng He |
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Affiliation: | a State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China b Department of Electronics Packaging Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | Al2O3 and Ti-6Al-4V alloy were brazed using Cu + TiB2 composite filler, which manufactured by mechanical milling of Cu and TiB2 powders. Typical interface microstructure of joint was Al2O3/Ti4(Cu,Al)2O/Ti2Cu + Ti3Al + Ti2(Cu,Al)/Ti2(Cu,Al) + AlCu2Ti/Ti2Cu + AlCu2Ti + Ti3Al + Ti2(Cu,Al) + TiB/Ti(s.s) + Ti2Cu/Ti-6Al-4V alloy. Based on temperature- and time-dependent compositional change, the formation of intermetallics in joint was basically divided into four stages: formation of interfacial Ti4(Cu,Al)2O in Al2O3 side, formation of Ti2Cu, Ti3Al, TiB, Ti2Cu, and AlCu2Ti in layers II and IV, formation of Ti2(Cu,Al) and AlCu2Ti in layer III, formation of Ti + Ti2Cu hypereutectoid organization adjacent to Ti-6Al-4V alloy. TiB in situ synthesized in joint not only acted as low thermal expansion coefficient reinforcement to improve the mechanical properties at room temperature, but also as skeleton ceramic of joint to increase high temperature mechanical properties of Al2O3/Ti-6Al-4V alloy joint increasing. When the joint containing 30 vol.% TiB brazed at 930 °C and 10 min of holding time, the maximum room temperature shear strength of joint was 96.76 MPa, and the high temperature shear strength of joint was 115.16 MPa at 800 °C. |
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Keywords: | Ceramics Metals and alloys Microstructure Mechanical properties |
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