Effect of Ti Content on Microstructure and Mechanical Properties of Si₃N₄/Si₃N₄ Joints Brazed with Ag-Cu-Ti+Mo Composite Filler

Abstract:

Mo particles have been introduced into Ag-Cu-Ti brazing alloy for the joining of Si3N4 ceramic. Effects of Ti content on microstructure and mechanical properties of the joints were investigated. The results present that a compact reaction layer which is composed of TiN and Ti5Si3 was formed at the Si3N4/solder interface. The central part of the joint was composed of Ag based solid solution, Cu based solid solution, Mo particles and Cu-Ti intermetallics. By increasing Ti content in the composite filler, both the thickness of reaction layer and the amount of Cu-Ti intermetallics in the joint increased, which is beneficial for the joint strength. However, the reaction between Ti and Si3N4 proceeded more excessively. Simultaneously, more Cu-Ti intermetallics were precipitated while elevating Ti content to 6wt.%, leading to deterioration of the bonding strength. The maximum bending strength (429.4MPa) was obtained when Ti content is 4wt.% in the composite filler.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2018-2021
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2018
• Online since: June 2010
• Authors: Jie Zhang, Yan Ming He
• Keywords: Ag-Cu-Ti+Mo Composite Filler, Brazing, Mechanical Property, Si₃N₄ Ceramic

References

[1] C. F. Liu, J. Zhang, Q. C. Meng, Y. Zhou, M. Naka: Ceram. Int. Vol. 33 (2007), p.427.

[2] G. W. Liu, G. J. Qiao, H. J. Wang, J. F. Yang, T. J. Lu: J. Euro. Ceram. Soc. Vol. 28(2008), p.2701.

[3] J. Lemus, Robin A. L. Drew: Mater. Sci. Eng. A. Vol. 352 (2003) pp.169-178.

[4] A. Abed, Issam S. Jalham: A. Hendry, J. Euro. Ceram. Soc. Vol. 21 (2001), p.283.

[5] J. W. Park, P. F. Mendez: T. W. Eagar, Acta Mater. Vol. 50 (2002), p.883.

[6] G. B. Lin, J. H. Huang, H. Zhang: J. Mater. Proc. Tec. Vol. 189 (2007), p.256.

[7] G. Blugan, J. Kuebler, V. Bissig: J. J. Rusch, Ceram. Int. Vol. 33 (2007).