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Journal of Materials Engineering and Performance

, Volume 27, Issue 10, pp 5470–5477 | Cite as

Wetting and Brazing of Chromium Film-Deposited Alumina Using AgCu Filler Metal

  • Z. B. Chen
  • H. Bian
  • C. N. Niu
  • X. G. Song
  • Y. Z. Lei
  • C. Jin
  • J. Cao
  • J. C. Feng
Article
  • 54 Downloads

Abstract

Wetting behavior of AgCu filler on chromium film-deposited Al2O3 ceramics was studied by sessile drop method under vacuum, and brazing of chromium-deposited alumina using AgCu was carried out. Cr film can improve the wettability of AgCu filler on alumina ceramics, and the contact angle decreased dramatically. However, with further increase in temperature and extension of wetting time, Cr atom might diffuse excessively to molten alloy or substrate leading to thinned or disappeared Cr film on alumina; thus, the contact angle of AgCu on alumina increased. The reliable alumina joint was obtained via chromium deposition using AgCu filler brazed at 900 °C for 10 min, and no hard or brittle intermetallic compounds formed in the brazed joint. The maximum shear strength of 16.8 MPa was achieved when the thickness of deposited chromium film was 2 μm.

Keywords

AgCu filler metal brazing chromium-deposited alumina interfacial microstructure wetting behavior 

Notes

Acknowledgments

This project is supported by National Natural Science Foundation of China (Grant Nos. 51775138 and U1537206) and the Key Research & Development program of Shandong Province (No. 2017GGX40103).

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Z. B. Chen
    • 1
  • H. Bian
    • 1
  • C. N. Niu
    • 1
  • X. G. Song
    • 1
    • 2
  • Y. Z. Lei
    • 2
  • C. Jin
    • 2
  • J. Cao
    • 1
  • J. C. Feng
    • 1
  1. 1.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina
  2. 2.Shandong Provincial Key Lab of Special Welding TechnologyHarbin Institute of Technology at WeihaiWeihaiChina

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