Thermal transformations in ultrafine plasmochemical zirconium dioxide powders

Thermal transformations in ultrafine plasmochemical zirconium dioxide powders

Dades bibliogràfiques
Parent link:Journal of Thermal Analysis and Calorimetry
Vol. 119, iss. 3.— 2015.— [P. 1603-1609]
Autor corporatiu: Национальный исследовательский Томский политехнический университет (ТПУ) Институт неразрушающего контроля (ИНК) Кафедра физических методов и приборов контроля качества (ФМПК)
Altres autors: Surzhikov A. P. Anatoly Petrovich, Gyngazov (Ghyngazov) S. A. Sergey Anatolievich, Frangulyan (Franguljyan) Т. S. Tamara Semenovna, Vasiljev I. P. Ivan Petrovich
Sumari:Title screen
The methods of thermal analysis and X-ray diffraction are used to investigate polymorphic transformations taking place under heating and cooling in nonstabilized ultrafine ZrO2 powders (ZrO2 UFP) synthesized in a plasmochemical process. It is found out that ZrO2 UFP is characterized by an increased content (up to 55 mass%) of tetragonal-phase particles, which is associated with the size effect of its stabilization. Heating of UFP within T = (25–700) °C, which is followed by the release of H2O, CH2O, and CO2, does not result in a change in its structural-phase state, while annealing within the temperature interval T = (700–1,000) °C gives rise to an increased growth of the size of t-ZrO2 crystallites and results in an elevated tetragonality of the crystal lattice (c/a). A complete t-ZrO2 > m-ZrO2 transition occurs as a result of heating the powder up to T = 1,300 °C. The effect of the dimensional factor on temperature characteristics of polymorphic m - t transitions and the value of their temperature hysteresis is established. It is shown that the powder particle size exerts the most pronounced influence on the temperature-dependent position of the point of martensitic transformation M s. As this influence is increased, M s is shifted toward the region of higher temperatures. This is followed by a decreased temperature hysteresis of the m - t martensitic transformations.
Режим доступа: по договору с организацией-держателем ресурса
Publicat: 2015
Matèries:
электронный ресурс
труды учёных ТПУ
Accés en línia:http://dx.doi.org/10.1007/s10973-014-4318-x
Format: Electrònic Capítol de llibre
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=639670

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