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

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 degrees C and 957.7 +/- 1.53 degrees 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 degrees 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.

journal_name

Dent Mater J

journal_title

Dental materials journal

authors

Nagasawa S,Yoshida T,Mizoguchi T,Terashima N,Ito M,Platt JA,Oshida Y

doi

10.4012/dmj.22.227

keywords:

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

227-43

issue

3

eissn

0287-4547

issn

1881-1361

journal_volume

22

pub_type

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