Determination of the Kinetic Parameters of Equilibrium and Nonequilibrium Crystallization of Bismuth from Thermograms
S. A. Frolova, O. V. Sobol, A. Yu. Sobolev
Donbas National Academy of Civil Engineering and Architecture
Abstract: Based on the bismuth thermograms, obtained during quasi-equilibrium (QEC) and nonequilibrium-explosive (NEC) crystallizations, the processes of melting and crystallization (with QEC) were investigated; nucleation, coagulation and isothermal recrystallization (at NEC). Thermokinetic parameters determined directly from the heating-cooling curves (times of melting tL0 and crystallization tS0, heating heat and cooling rates vcool, etc.) were found, been used to calculate the rate of mass crystallization vS, the temperature rate of explosive crystallization w, the fraction of nuclei in a supercooled melt a, fraction b of the coagulated melt during time t2, etc.). A significant difference in the parameters of crystallization of the QEC and NEC type was established, associated with the fact that the stage of nucleation and coagulation practically disappears for QEC.
Keywords: bismuth, thermal analysis, overheating, crystallization, supercooling, nucleation, crystal-lization time, crystallization rate.
Pages: 87-92.
Link for citation: Frolova, S. A.; Sobol, O. V.; Sobolev, A. Yu. Determination of the Kinetic Parameters of Equilibrium and Nonequilibrium Crystallization of Bismuth from Thermograms. – Text : electronic. – In: Proceeding of the Donbas National Academy of Civil Engineering and Architecture. – 2021. – Issue 2021-1(147) Modern building materials. – Р. 87-92. – URL: https://donnasa.ru/publish_house/journals/vestnik/2021/2021-1(147)/st_11_frolova_sobol_sobolev.pdf (date of access: 15.10.2024). (in Russian)
Issue 2021-1 (147)Journal: Proceeding of the Donbas National Academy of Civil Engineering and Architecture
Publish house: Donbas National Academy of Civil Engineering and Architecture