High temperature characteristics and solidification microstructures of dental metallic materials part I: Silver-palladium-copper-gold alloy

Sakae Nagasawa, Takamitsu Yoshida, Toshihide Mizoguchi, Nobuyoshi Terashima, Michio Ito, Jeffrey A. Platt, Yoshiki Oshida

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Ag-Pd-Cu-Au alloy was subjected to a Thermo-Mechanical Analyzer to investigate high temperature properties up to its liquidus temperature. Microstructural examination and elemental analysis with EPMA were also conducted in the solid/liquid mixture region. The following conclusions were obtained. (1) The solidus temperature was 838.3±2.52°C and 957.7±1. 53°C for the liquidus point. (2) Thermal expansion coefficients were 1.39±0.08% at the solidus, 2.338±0.13% at the liquidus, and the melting expansion coefficient was 0.932±0.058%. (3) The expansion during melting was controlled by a small amount of pressure such as 1/100 of the air pressure, therefore the fit accuracy of castings is suggested not to be influenced by the solidification shrinkage. (4) Although the softening heat treatment and casting exhibited an influence on thermal expansion behavior, casting temperature in addition to post-casting plastic deformation did not show an effect on the thermal expansion. (5) The yield strength at 750°C was reduced down to about 1/400 of that at room temperature, and the modulus of elasticity was about 1/100 of the room temperature value.

Original languageEnglish (US)
Pages (from-to)227-243
Number of pages17
JournalDental Materials Journal
Volume22
Issue number3
DOIs
StatePublished - Sep 2003

Keywords

  • High temperature characteristics
  • Silver-Palladium-Copper-Gold dental alloy
  • Solidification microstructure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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