Evaluation of the Amalgamation Reaction of Experimental Ag-Sn-Cu Alloys Containing Pd Using a Mercury Plating Technique

概要

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A mercury plating technique was used to determine the phases forming on experimental Ag-Sn-Cu alloy powders (with and without Pd) exposed to electrolytically deposited mercury. Four series of alloy powders were made: a) 1.5% Pd with 10-14% Cu (CU series); b) 1.0% Pd with 10-14% Cu (1PD series); c) 1.5% Pd with different ratios of Ag_3Sn (γ) to Ag_4Sn (β) with 12% Cu (AGSN series); and d) 9-13% Cu with no Pd (NOPD series). Each powder was pressed on a freshly prepared amalgam specimen made from the same powder and metallographically polished until cross sections appeared; mercury was electroplated on the alloy particles. Alloy powders, amalgams and electroplated specimens were examined using XRD and SEM/EDS. XRD confirmed the presence ofγ, in amalgams made from alloys with Cu< 13% or with Ag_3Sn/Ag_4Sn> 0.8. Specimens with moderately plated Hg showed γ_1, (Ag_2Hg_3) polyhedra and η'Cu_6Sn_5, but not γ_2. This method effectively identifies alloys prone to forming γ_2.
日本歯科理工学会の論文