Carbothermal reduction reaction enhanced wettability and brazing strength of AgCuTi-SiO2f/SiO2 system |
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| Affiliation: | 1. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;2. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | A carbothermal reduction reaction (CRR) approach was developed in this research to tailor the surface phase structure of the SiO2f/SiO2 composites with high chemical reactivity to replace the original inert surface. Results show that SiC can form after CRR treatments. For AgCuTi-SiO2f/SiO2 wetting interfaces, TiC and residual pyrolytic carbon layer can be found inside the reaction layer, which was the key, promoting the wettability of the AgCuTi-SiO2f/SiO2 system. The contact angle of the AgCuTi-SiO2f/SiO2 system dropped from 127° to 43° after the CRR treatments. The reliability of the bonded AgCuTi-SiO2f/SiO2 interface was also characterized by putting 3 different systems into comparison, i.e., the original AgCuTi-SiO2f/SiO2 system, the AgCuTi-SiO2f/SiO2 system with CRR treatments (SiC formation) and the AgCuTi-SiO2f/SiO2 system coated with powdered carbon (no SiC formation). The shear strength of the SiO2f/SiO2-AgCuTi-SiO2f/SiO2 system with CRR treatments was the highest, which was 3 times that of the other 2 brazing systems. |
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| Keywords: | Carbothermal reduction reaction Wetting Interfacial reaction Pyrolytic carbon Shear strength |
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