In-Situ synthesized TiC nano-flakes reinforced C/C composite-Nb brazed joint. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Wang, Ze Yu; Li, Man Ni; Ba, Jin; Ma, Qiang; Fan, Zeng Qi; Lin, Jing Huang; Zhong, Zheng Xiang; Qi, Jun Lei; Cao, Jian; Feng, Ji Cai
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 4(2018)
• Page Start: 1059
• Page End: 1068
• Publication Date: 2018-04
• Subjects: Brazing -- C/C composite -- Residual stress -- Polymer carbonization -- In-situ TiC nano-flakes; 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.2017.11.059
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Brazing C/C composite to Nb is often associated with the problem of high residual stress, resulting in low-strength joints. To overcome these problems, here we carried out a simple polymer carbonization process to acquire uniform carbon-covered Cu foam composite interlayer, which was subsequently used for soundly brazing C/C composite and Nb with the assembly of C/C composite/Ag-Cu-Ti foil/C-Cu foam/Ag-Cu-Ti foil/Nb. Microstructure and mechanical properties of the joints were well investigated. The carbonization reacted with Ti elements, forming uniformly distributed in-situ TiC nano-flakes in the joint seam by virtue of the porous Cu foam skeleton. Results present that the in-situ TiC nano-flakes not only greatly reduced the thermal expansion coefficient but also effectively impeded the Cu solid solutions agglomeration. The average shear strength of the joint brazed with 3% C-Cu (wt.%) foam interlayer reached ∼52.8 MPa with the brazing temperature of 880 °C for 10 min.