Metallurgical and Materials Transactions A

, Volume 49, Issue 11, pp 5823–5832 | Cite as

Wetting Behaviors and Interfacial Characteristics of Sn0.3Ag0.7Cu Alloys Containing Ti or Cr on Graphite

  • Wei Fu
  • Shengpeng Hu
  • Xiaoguo SongEmail author
  • Yixuan Zhao
  • Hong Bian
  • Cheng Jin


The interactions of Ti and Cr in a Sn0.3Ag0.7Cu melt with graphite were studied by continuous-heating and isothermal wetting experiments. Active Ti and Cr both had positive influences on the wettability of Sn0.3Ag0.7Cu on graphite. The Sn0.3Ag0.7Cu-Ti melt began to spread on graphite at 650 °C, while the Sn0.3Ag0.7Cu-Cr melt needed a temperature higher than 750 °C. Under the same processes, the spreading of the Sn0.3Ag0.7Cu-Cr melt was faster than that of the Sn0.3Ag0.7Cu-Ti melt. For the Sn0.3Ag0.7Cu-Ti/graphite system, the final contact angle was dependent on the isothermal temperature rather than the content of Ti, and the opposite was observed for the Sn0.3Ag0.7Cu-Cr/graphite system. Microanalyses revealed that nonstoichiometric TiCx and Cr-C compounds (Cr3C2 and Cr7C3) formed at the droplet/graphite interface. A smaller stoichiometry x of TiCx or more Cr7C3 in the Cr-C mixture indicated a better wetting. The thermodynamics of the interfacial reaction was calculated, and it was favorable. The faster spreading of the Sn0.3Ag0.7Cu-Cr melt and the more violent interfacial reaction were due to the higher activity of Cr than Ti in the melt.



We are grateful to the helpful discussion and suggestions of Dr. V. Fabrizio and Dr. A. Passerone of Inst. of Condensed Matter Chemistry and Technologies for Energy-ICMATE-CNR. 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).

Supplementary material

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Copyright information

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

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina
  2. 2.Shandong Provincial Key Laboratory of Special Welding TechnologyHarbin Institute of Technology at WeihaiWeihaiChina

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