Properties and fracture processes of Si₃N₄/ Si₃N₄ joints brazed using Cu–Zn–Ti filler alloy

Authors: Zhang, J.; Naka, M.; Fang, H. Y.; Zhou, Y.

Source: Science and Technology of Welding & Joining, Volume 9, Number 2, April 2004 , pp. 158-162(5)

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Abstract:

Si₃N₄ ceramic was jointed to itself using a filler alloy of Cu-Zn-Ti at 1123-1323 K for 0.3-2.7 ks. Ti content in the Cu-Zn-Ti filler alloy was varied from 5 to 20 at.-%. The effect of brazing parameters, such as brazing temperature, holding time and Ti content, on the mechanical properties and facture processes of the Si₃N₄/Si₃N₄ joint were investigated. The results indicated that the increased brazing temperature, holding time and Ti content increase the thickness of the interfacial reaction zone in the Si₃N₄/filler alloy, and the size and amount of the reaction phases in the filler alloy. Their increases lead to increasing shear strength of the joint. The fracture behaviour of the Si₃N₄/Si₃N₄ joint greatly depends on the microstructure of the joint. A suitable thick reaction zone with reaction phases yields the high strength of the Si₃N₄/ Si₃N₄ joint.

Keywords: BRAZING; CU-ZN-TI FILLER; CERAMICS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/136217104225017062

Publication date: 2004-04-01

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