Study on 3-dimensional graphene sponge reinforced C/C composites-TiAl alloy brazed joints

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

“…The primary issue is the poor wettability of brazes on the C/C composites. Active elements (such as Ti and Cr) have been added to braze alloy with the purpose to improve the wettability of the brazes on the carbon substrate [11][12][13][14][15][16]. Currently active brazing alloy including Ag-Cu-Ti, Cu-Ti and Ni-Ti have been most frequently used to braze C/C composites to metals.…”

Microstructure and stress relief mechanism of C/C composite and GH3044 superalloy joints using (Cu)+Ti5Si3 foil filler

“…12 However, there is a large residual stress in the C/C-metals brazed joints due to the large coefficient of thermal expansion (CTE) mismatches between C/C composites and metals, which will damage the mechanical properties of joints and even directly lead to joint failure. 13,14 In order to relieve the residual stress in the joints of heterogeneous materials, composite brazing by introducing reinforcements with low CTE and high-temperature resistance into the joining layer was developed. 15 In the reported composite brazing, there are mainly two methods to introduce reinforcements into the joining layer: one is to directly add the reinforcements, such as SiC particles, 16 Carbon, Nano-Al 2 O 3 , 17 and W particles, 18 into the powder fillers before brazing; the other is to synthesize reinforcements, such as TiB, 19 TiC 20 and AgTi compounds, 21 through in-situ reactions between powder fillers during brazing.…”

“…Among them, brazing is the most suitable joining method because of its simplicity, convenience, and low cost 12 . However, there is a large residual stress in the C/C‐metals brazed joints due to the large coefficient of thermal expansion (CTE) mismatches between C/C composites and metals, which will damage the mechanical properties of joints and even directly lead to joint failure 13,14 . In order to relieve the residual stress in the joints of heterogeneous materials, composite brazing by introducing reinforcements with low CTE and high‐temperature resistance into the joining layer was developed 15 .…”