Metallurgical and Materials Transactions B

, Volume 49, Issue 3, pp 902–911 | Cite as

Improving the Strength of the ZrC-SiC and TC4 Brazed Joint Through Fabricating Graded Double-Layered Composite Structure on TC4 Surface

  • J. M. Shi
  • L. X. Zhang
  • Q. Chang
  • Z. Sun
  • J. C. Feng
  • N. Ma
Topical Collection: Metallurgical Processes Workshop for Young Scholars
Part of the following topical collections:
  1. International Metallurgical Processes Workshop for Young Scholars (IMPROWYS 2017)


In order to improve the ZrC-SiC ceramic and TC4 brazed joint property, graded double-layered SiC particles (SiCp)-reinforced TC4-based composite structure (named as GLS for convenience) was designed to relieve the residual stress in the joint. The GLS was successfully fabricated on TC4 substrate by double-layered laser deposition technology before the brazing process. The investigation of the GLS shows that the volume fraction of SiCp in the two composite layers was graded (20 and 39 vol pct, respectively). Ti5Si3 and TiC phases formed in the GLS due to the reaction of SiCp and TC4. The laser power-II (the laser power for the second deposition layer) affected the microstructure of the GLS significantly. Increasing the laser power-II would promote the reaction between the SiCp and TC4. But the high laser power-II made the layer I remelt completely and the two layers became homogeneous rather than graded structure. In the ZrC-SiC and TC4 brazed joint, the CTE (coefficient of thermal expansion) was graded from the TC4 to the ZrC-SiC due to the GLS, and the strength of the joint with the GLS (91 MPa) was higher than that without the GLS (43 MPa).



The authors are grateful to the financial support of the National Natural Science Foundation of China (Grant Nos. 51522404 and 51621091), the author Shi JM is grateful to the financial support of China Scholarships Council (No. 201606120128).


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • J. M. Shi
    • 1
  • L. X. Zhang
    • 1
  • Q. Chang
    • 1
  • Z. Sun
    • 1
  • J. C. Feng
    • 1
  • N. Ma
    • 2
  1. 1.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina
  2. 2.Joining and Welding Research InstituteOsaka UniversityIbarakiJapan

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