Journal Published Online: 08 January 2009
Volume 6, Issue 2

Dilatometric Analysis for Investigating Age Hardening in a Commercial Precious Metal Dental Alloy

CODEN: JAIOAD

Abstract

Age hardening in a commercial precious metal dental alloy based on the Au–Cu–Ag system with platinum addition was investigated by light optical microscope, scanning electron microscope, energy dispersion x-ray system microanalysis, image analysis, hardness measurements, and dilatometric tests. Dilatometric tests are known to give important information for optimizing the heat treatment parameters of metallic materials but are seldom used in studying the hardening of precious alloys. Nonisothermal dilatometric tests were used to point out the temperature range within which the microstructural hardening transformations occur, while isothermal tests were adopted to study the kinetics of each transformation. The macrohardness and microhardness measurements contributed to the understanding of the nature of the observed transformations, together with the microstructural analysis. We concluded that hardening is mainly due to order-disorder transformations taking place in the matrix. The identified optimal parameters were used for the heat treatment of a lost wax casting alloy prepared according to the traditional procedures for prosthesis manufacturing.

Author Information

Rivolta, B.
Polo Regionale di Lecco, Politecnico di Milano, Lecco, Italy
Gerosa, R.
Polo Regionale di Lecco, Politecnico di Milano, Lecco, Italy
Pinasco, M.
Sezione di Chimica Inorganica e Metallurgia, Dipartimento di Chimica e Chimica Industriale, Università di Genova, Genova, Italy
Pellati, G.
Sezione di Chimica Inorganica e Metallurgia, Dipartimento di Chimica e Chimica Industriale, Università di Genova, Genova, Italy
Pages: 12
Price: $25.00
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Details
Stock #: JAI101581
ISSN: 1546-962X
DOI: 10.1520/JAI101581