期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 5, 页码 3072-3081出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.05.072
关键词
Silicon carbide; Electric current assisted joining; Diffusion bonding
资金
- US Department of Energy Office of Fusion Energy Sciences [DE-AC05-00OR22725]
- UT-Battelle, LLC
- China Scholarship Council [201706690006]
The study successfully demonstrated the joining of SiC materials at relatively low temperature through the electric current-assisted joining (ECAJ) method. Enhancing the current passage achieved the joining of low-resistivity grade, nitrogen doped beta-SiC; rapid crystal growth of textured SiC was found at the interface when joining at higher temperatures.
Conventional direct joining technologies are difficult to use with silicon carbide (SiC) materials, especially for fiber composite forms of SiC, because of the harsh conditions required. To reduce the temperature and/or process time required for the direct joining process, an electric current-assisted joining (ECAJ) method was studied. Joining of low-resistivity grade, nitrogen doped beta-SiC was demonstrated at a relatively low nominal temperature of 1750 degrees C with a 10 min hold by enhancing the passage of current through the material. The joining mechanism is discussed in terms of localized overheating and accelerated self-diffusion at the interface. In the case of joining at 2160 degrees C for 1 min, rapid crystal growth of textured SiC was found at the interface. This study indicates that rapid ECAJ-based direct joining is a practical and appropriate method for joining SiC-based materials.
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