Microstructural and mechanical properties of porous Si3N4 carbon coated ceramic brazed with a cobalt-silicon filler

Y. L. Zhuang, T. S. Lin, S. J. Wang, P. He, D. P. Sekulic, D. C. Jia

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The Co22.5Si77.5 (at.%) braze was used to bond porous Si3N4 ceramics. The effects of brazing temperature on microstructure and the bonding strength of the joint were studied. The results reveal that no visible reaction layer was observed. The corresponding joint strength was low. In order to improve the joint strength a carbon coated modification of the porous Si3N4 substrate was suggested. The impact of this modification on the joint properties was examined. It was established that a SiC reaction layer with a thickness from ∼15 μm to ∼65 μm was formed at the interface and SiC nanowires were observed when the temperature increased from 1280 °C to 1340 °C. The maximum shear strength of the carbon coated and uncoated joints were 115 MPa and 44 MPa, respectively. The significant improvement of the joint strength was attributed to the SiC reaction layer and a strengthening by the presence of SiC nanowires.

Original languageEnglish
Pages (from-to)3293-3301
Number of pages9
JournalJournal of the European Ceramic Society
Issue number10
StatePublished - Aug 2017

Bibliographical note

Funding Information:
This research was supported by National Natural Science Foundation of China. (NSFC, 51402068, 51475103). The work of one of the authors (DPS) has been supported through the Distinguished Foreign Expert 1000 Plan professorship at the Harbin Institute of Technology.

Publisher Copyright:
© 2017 Elsevier Ltd


  • Brazing
  • Co-Si filler
  • Porous SiN
  • SiC nanowires

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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