Calorimetric studies of Ag–Sn–Cu dental amalgam alloy powders and their amalgams
| Autor: | Nivedita Dutta Chowdhury, K.S. Ghosh |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Enthalpy Alloy Metallurgy Analytical chemistry 030206 dentistry 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Dental amalgams Chemical reaction 03 medical and health sciences 0302 clinical medicine Differential scanning calorimetry Reaction sequence engineering Physical and Theoretical Chemistry Amalgam (chemistry) 0210 nano-technology Eutectic system |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 130:623-637 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | Differential scanning calorimetry (DSC) technique has been used to examine the reaction sequence in dental amalgam alloy powders of (1) Ag–Cu–Sn lathe-cut particles (single composition type in dentistry terminology), (2) mixture of lathe-cut Ag–Sn–low Cu and spherical particles of Ag–Cu eutectic composition (admix type) and (3) their amalgams, i.e. alloys of liquid Hg and these dental amalgam alloy powders. All the peaks in the DSC curves have been identified and discussed. DSC curves of single composition-type powders showed as many as six distinct peaks, whereas admix-type powders showed only four peaks. Quite interestingly, amalgam of single composition powders exhibited only three peaks, whereas amalgam of admix type displayed four distinct peaks. The noticeable differences of peak positions in the DSC curves of the amalgam powders and their amalgams and the associated chemical reactions have been explained. DSC curves of the alloy powders and their amalgams studied at four different heating rates have showed peak shifting and the variation of change of enthalpy (ΔH) as well with the heating rates (v h). The peak temperatures and the heat evolved and absorbed of all the peaks have been determined with the help of built-in software available in the DSC unit. |
| Databáze: | OpenAIRE |
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