Joining of CVD β-SiC and Cf/SiC to themselves using in-situ formed SiC-ZrC interlayer
HOSSEINI N. 1, CHLUP Z. 2, KOVALCÍKOVÁ A. 3, ZHOU X. 4, ŠIšKA F. 2, DLOUHÝ I. 2, TATARKO P. 1
1 Institute of Inorganic Chemistry, Slovak Academy of Science, Bratislava, Slovakia; 2 Institute of Physics of Materials, Czech Academy of Sciences, Brno, Czechia; 3 Institute of Materials Research, Slovak Academy of Sciences, Košice, Slovakia; 4 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
In this work, CVD β-SiC and Cf/SiC ceramics were joined to themselves with in-situ formed SiC-ZrC ceramic composite interlayer and the mechanical properties of the joints were investigated. The ZrSi2 alloy and ZrSi2-C powders mixture were applied as an interlayer on the joining surfaces of the materials in the form of a slurry. Afterward, the pressure-assisted joining was performed via field-assisted sintering technology at different temperatures (1400 – 1650?). The joints with pure ZrSi2 alloy showed a non-homologous interlayer, consisting of both ZrC and remaining ZrSi2. In addition, a significant reaction with SiC substrate was observed, leading to the dissolution of SiC and infiltration of the filler into the base materials. When ZrSi2-C interlayer was used, the uniform SiC-ZrC composite interlayer was formed by in-situ reactions between ZrSi2, C, and SiC-based ceramics. The strength of the CVD β-SiC joints was investigated using 4 points flexural test, while the mechanical performance of Cf/SiC joints was determined using shear strength measurements. The strength of the joints was significantly improved with the increasing joining temperature, and reached the initial strength of the reference, un-joined CVD β-SiC and/or Cf/SiC materials.
Acknowledgement:
This work was supported by the Slovak Research and Development Agency under the contract no. APVV-SK-CZ-RD-21-0089 and APVV-19-0497. The support of the project VEGA 2/0116/22 is also acknowledged.