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Fabrication of Composite Filler Metal by Melt Infiltration  

Park, Heung-Il (Division of Materials Science and engineering,Pukyung National University)
Kim, Ji-Tae (Dept. of Materials Processing Engineering,Graduate School of Industry,Pukyung National University)
Kim, Woo-Yeol (Division of Materials Science and engineering,Pukyung National University)
Publication Information
Journal of Korea Foundry Society / v.23, no.5, 2003 , pp. 244-250 More about this Journal
Abstract
The aim of this study is fabricating of composite filler metal (CFM) by a combination of selective laser sintering (SLS) of stainless steel powders (RapidSteel $2.0^{TM}$ and liquid phase infiltration of Ag-28 wt.%Cu alloy. Porous stainless steel body with inter-connected pore channels was fabricated by SLS, binder decomposing and densification processes. By the direct contact infiltration, the narrow inter-particle channels of the porous body were completely filled with the Ag-28 wt.%Cu alloy infiltrant. During infiltration, the dissolved elements of Fe, Ni and Cr from the porous body were solved into copper solid solution phases, which consist of eutectic structure of composite metal matrix. The S10C/CFM/S10C joints, which have narrow clearance gaps between them up to 10 micrometers, were joined successfully by self-feeding of filler metal from the matrix of CFM. The CFM kept its original thickness and microstructure after brazing. The tensile strength of brazed specimen was higher than 30 kgf/$mm^2$ and showed a typical ductile fracture mode in the CFM.
Keywords
Composite filler metal; Selective laser sintering; Melt infiltration; Brazing;
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