期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 3, 页码 1834-1840出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.10.059
关键词
SiC; Joining; Ti3SiC2; Whisker; Electric field-assisted sintering
资金
- National Natural Science Foundation of China [11975296, 51811540402]
- Korea Ministry of Education [NRF-2018K2A9A2A06018203]
- Ningbo 3315 Innovative Teams Program, China [2019A-14-C]
- MVTS project of SAS UltraCom within the scheme of Support of the Seal of Excellence projects
Monolithic SiC was successfully joined using a SiC whisker-reinforced Ti3SiC2 composite filler via electric field-assisted sintering technique, achieving a joint strength higher than 250 MPa. Optimization of process parameters and the addition of up to 15 wt. % SiC whiskers improved joint strength, but a lower joint strength was observed with 20 wt. % SiC whisker addition due to thermal expansion mismatch.
Monolithic SiC, for the first time, was successfully joined using a SiC whisker-reinforced Ti3SiC2 composite (SiCw/Ti3SiC2) filler via electric field-assisted sintering technique. A thin Ti coating layer was formed on the SiC surface to minimize the residual stress at the joint interface by transforming it into a TiC gradient layer. After optimizing process parameters, a joint strength higher than 250 MPa was obtained, which is higher than the other values reported in the literature. Failure occurred at the SiC base rather than the joining interface because of the improved joint strength by the incorporation of SiCw. The addition up to 15 wt. % SiCw in the filler layer improved the joint strength by various strengthening mechanisms. On the other hand, the joint strength was lower with 20 wt. % SiCw addition, indicating the importance of thermal expansion mismatch between SiCw and Ti3SiC2 to obtain a sound SiC joint.
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