High-strength SiC joints with a novel in-situ formed SiC/Al4SiC4 joining filler. Issue 15 (December 2020)

• Record Type: Journal Article
• Authors: Liu, Junwen; Zhou, Xiaobing; Tatarko, Peter; Yuan, Qin; Chen, Ke; Wu, Haibo; Huang, Zhengren; Huang, Qing
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 15(2020)
• Page Start: 5172
• Page End: 5179
• Publication Date: 2020-12
• Subjects: SiC -- Al4SiC4 -- Joining -- Electric field-assisted sintering technique; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.07.041
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The in-situ formed SiC/Al4 SiC4 joining layer was used to join monolithic SiC using an electric field-assisted sintering technique. A multiphase powder of Al4 C3 /SiC/Al4 SiC4 was used as the initial joining material to obtain the in-situ reaction layer of SiC/Al4 SiC4 via the appropriate interface reactions. The bending strength as high as 240.5 ± 6.6 MPa was obtained for the sample joined at 1800 °C, which was higher than the strength of the un-joined SiC matrix. Sound joints were obtained when Al4 C3 was completely transformed to Al4 SiC4, and a fully dense SiC/Al4 SiC4 joining layer was consolidated. The integration of the joining layer with the SiC matrix was improved by a high amount of liquid phase formed at the interface. The proposed SiC/Al4 SiC4 joining layer, with good thermal matching with SiC matrix, shows a great potential to be applied as a joining material for SiC-based ceramic matrix composites.