Phase Equilibrium in Ag-Pd-Cu Dental Alloys
DOI:
https://doi.org/10.3109/00016358309162348Keywords:
Hardness, solid-solution annealing, X-ray diffractionAbstract
A dental alloy consisting of Ag-Pd-Cu-Au has been annealed at various temperatures and subsequently quenched to produce a solid solution before a hardening heat treatment. The phases present were studied by means of X-ray diffraction measurements. As in conventional Au-Ag-Cu alloys, an equilibrium of two FCC (face-centered cubic) phases existed up to the solid solution annealing temperature, which is considerably higher in the present alloy (900°C). However, even a rapid quench from 900°C caused a small amount of decomposition of the matrix. The X-ray diffractogram indicated that this new phase is CuPd with a CsCl(B2) superstructure. The greatest hardness after age-hardening at 350°C was achieved with a proper prerequisite solid-solution annealing.
Acta Odontologica Scandinavica publishes original research papers as well as critical reviews relevant to the diagnosis, epidemiology, health service, prevention, aetiology, pathogenesis, pathology, physiology, microbiology, development and treatment of diseases affecting tissues of the oral cavity and associated structures including papers on cause and effect or explanatory/associative relationships for experimental or observational studies.
