Influence of sulphur on the microstructure and properties of Ag–Cu–Zn brazing filler metal. (October 2013)

• Record Type: Journal Article
• Authors: Chen, Y.; Yun, D.; Sui, F.; Long, W.; Zhang, G.; Liu, S.
• Is Part Of: Materials science and technology. Volume 29:Number 10(2013:Oct.)
• Page Start: 1267
• Page End: 1271
• Publication Date: 2013-10
• Subjects: Brazing -- Filler metal -- Sulphur -- Microstructure -- Properties; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284713Y.0000000284
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The effect of sulphur on the microstructure and properties of Ag45–Cu30–Zn25 brazing filler metal was investigated. Under the given experimental conditions, the sulphuration products mainly consisted of CuS, ZnS, Ag2 S, Cu2 S and Ag3 CuS2 . These sulphides not only distributed on the surface but also diffused into the interior of the filler metal and cut apart the matrix thereby significantly damaging the tensile strength of the filler metal from 658 to 283 MPa. The corresponding fracture characterisation turned from ductile fracture to brittle fracture. The sulphides existed as solid particles, which hinder the spreading of the liquid filler metal and the spreading area dramatically decreased from 317⋅09 to 18⋅55 mm 2, which indicates that the filler metal rarely wets the base metal.