Evaluation of the amalgamation reaction of experimental Ag-Sn-Cu alloys containing Pd using a mercury plating technique

Marie Koike, Jack L. Ferracane, Hiroyuki Fujii, Toru Okabe

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

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 Ag3Sn (γ) to Ag4Sn (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 of γ2 in amalgams made from alloys with Cu < 13% or with Ag3Sn/Ag4Sn > 0.8. Specimens with moderately plated Hg showed γ1 (Ag2Hg3) polyhedra and η′ Cu6Sn5, but not γ2. This method effectively identifies alloys prone to forming γ2.

Original languageEnglish (US)
Pages (from-to)280-291
Number of pages12
JournalDental materials journal
Volume22
Issue number3
DOIs
StatePublished - Sep 2003

Keywords

  • Amalgamation reaction
  • Mercury-plating
  • Palladium

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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