4.7 Article

Ultrafast low-temperature near-seamless joining of Cf/SiC using a sacrificial Pr3Si2C2 filler via electric current field-assisted sintering technique

Journal

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 42, Issue 15, Pages 6865-6875

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.08.026

Keywords

Cf; SiC; Joining; Electric current field-assisted sintering

Funding

  1. National Natural Science Foundation of China [11975296, 52102122]
  2. Natural Science Foundation of Ningbo city [2021J199]
  3. Ningbo 3315 Innovative Teams Program, China [2019A-14-C]
  4. Advanced Energy Science and Technology Guangdong Laboratory [HND20TDTHGC00]

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A novel layered structure material, Pr3Si2C2, was successfully synthesized using a molten salt approach, and used as a joining filler for carbon fibers reinforced SiC composites. A near-seamless joint was achieved by the newly precipitated SiC grains, which were well densified with the Cf/SiC matrix. The formation of near-seamless joint eliminates the thermal mismatch issues.
A novel layered structure material, Pr3Si2C2, was synthesized at a low temperature of 850 degrees C using a molten salt approach for the first time, and subsequently used as the joining filler for carbon fibers reinforced SiC composites (Cf/SiC). A robust near-seamless Cf/SiC joint was successfully obtained at 1509 degrees C (Ti) for 30 s, while an ultrafast heating rate of 6000 degrees C/min was applied via electric field-assisted sintering technology. The near-seamless joining process was attributed to the newly precipitated SiC grains, which were densified well with the Cf/SiC matrix by liquid-assisted sintering. The liquid phase was in-situ formed by the eutectic reaction between Pr3Si2C2 and SiC. The shear strength of the near-seamless joint obtained at 1509 degrees C for 30 s was 17.6 +/- 3.0 MPa. The failure occurred in the Cf/SiC matrix. The formation of near-seamless Cf/SiC joints dismisses the issues related to thermal mismatch between Cf/SiC matrices and traditional joining fillers.

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