The effect of a carbon layer on the microstructural and mechanical properties of porous BN/Si3N4 ceramic brazed with a titanium-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

5 Scopus citations

Abstract

The Ti22Si78 (wt.%) braze was used to bond porous BN/Si3N4 ceramic. The results revealed that the joint strength was low. In order to improve the joint strength, a carbon coated modification of the porous BN/Si3N4 substrate, achieved by the pyrolysis of phenol-formaldehyde resin was suggested. The thickness of carbon layer was controlled by the volume ratio of phenol-formaldehyde resin and methyl alcohol (R/M). The effect of the carbon layer on the microstructure and mechanical properties of the joint was examined. It was established that the maximum joint strength was achieved at the level of 80 MPa (as opposed to the uncoated joint with only 30 MPa) when R/M was 1:2, at the given brazing temperature. The improvement of the joint strength is attributed mainly to the formation of a SiC infiltration reaction layer, a significant population of SiC nanowires, as well as TiN0.7C0.3 and TiB2 particles.

Original languageEnglish
Pages (from-to)1288-1298
Number of pages11
JournalJournal of the European Ceramic Society
Volume38
Issue number4
DOIs
StatePublished - Apr 2018

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.

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

Keywords

  • Brazing
  • Carbon layer
  • Porous BN/SiN
  • Ti-Si filler

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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