Abstract
C/SiC composites and Nb were brazed with equiatomic ratio Ti-Ni composite foils in vacuum, and the effects of surface state of C/SiC composites on the microstructure and property of the brazing joints were investigated. The results showed that the (Ti,Nb)C reaction layer between C/SiC and filler metal in the brazing joint was serrate when the C/SiC surface state was cut by the electric spark linear cutting machine, but the (Ti,Nb)C layers were both flat when the surface of C/SiC were polished and sanded before brazing. The serrate reaction layer decreased the stress concentration at the C/SiC-filler metal interface and was benefit for the joint. The shear strength of brazing joints of Nb and C/SiC at spark cutting state reached 188 MPa, which is much higher than that at polishing and sanding states. The fracture of brazing joints of Nb and C/SiC at spark cutting state took place at C/SiC base material, C/SiC-filler metal interface and filler metal, but that of the other two kinds of joints mainly occurred at the C/SiC-filler metal interface.
| Original language | English |
|---|---|
| Pages (from-to) | 31-34 |
| Number of pages | 4 |
| Journal | Hanjie Xuebao/Transactions of the China Welding Institution |
| Volume | 31 |
| Issue number | 10 |
| State | Published - Oct 2010 |
Keywords
- Braze
- C/SiC composites
- Microstructure
- Shear strength
- Surface state
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