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Kinetics of isothermal phase transformations in a dental porcelain

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The dissolution of leucite (KAlSi2O8) and the precipitation of sanidine (Na x K1−x AlSi3O8; 0.1<x<0.3), occurring during isothermal heat treatments of a dental porcelain for porcelain-fused-to-metal restorations, was studied. The identification of phases was performed by X-ray diffraction, optical and scanning electron microscopy. An isothermal time-temperature-transformation (TTT) diagram, from 800 to 1000°C, and for periods up to 1440 min, is proposed. No metastable cubic leucite was retained by air-quenching in any sample. No increase of leucite volume fraction was observed.

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Authors and Affiliations

  1. Facultad de Odontología, Universidad de Buenos Aires, M. T. de Alvear 2142, 1122, Buenos Aires, Argentina

    M. M. Barreiro

  2. Departamento de Materiales, Comisión Nacional de Energía Atómica, Av. del Libertador 8250, 1429, Buenos Aires, Argentina

    E. E. Vicente

Authors
  1. M. M. Barreiro
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  2. E. E. Vicente
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Barreiro, M.M., Vicente, E.E. Kinetics of isothermal phase transformations in a dental porcelain. J Mater Sci: Mater Med 4, 431–436 (1993). https://doi.org/10.1007/BF00122204

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