NDLI: A thermoanalysis of phase transformations and linear shrinkage kinetics of ceramics made from ultrafine plasmochemical ZrO$_{2}$(Y)–Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Surzhikov, A. P. Frangulyan, T. S. Ghyngazov, S. A.
Copyright Year	2013
Abstract	The methods of X-ray diffraction analysis, thermogravimetric analysis, differential scanning calorimetry, and dilatometry are used to study special features of the structural-phase state of the 80 mass% ZrO$_{2}$(Y)–20 mass% Al$_{2}$O$_{3}$ plasmochemical powders (PCPs) and their effects on the sintering of composite ceramics. It is revealed that the ZrO$_{2}$(Y)–Al$_{2}$O$_{3}$ powder composite represents a mechanical mixture containing crystalline tetragonal zirconium dioxide and aluminum oxide nanoparticles, the latter found in an amorphous state and partially included into the ZrO$_{2}$(Y) lattice, thus forming metastable solid solutions of variable composition. Heating of the composite powder within the temperature range 740–1,000 °C reveals an exothermal effect associated with decomposition of metastable states of aluminum oxide. This is accompanied by the formation of the corundum-phase nuclei having subcritical dimensions. They achieve the critical sizes at higher temperatures T > 1200 °C, when α-Al$_{2}$O$_{3}$ is finally crystallized. The shrinkage response of the powder compacts during non-isothermal sintering is measured in a sensitive dilatometer. It is shown that the shrinkage curve consists of several stages that closely correlate with the concurrent structural-phase transformation in the composite ZrO$_{2}$(Y)–Al$_{2}$O$_{3}$ powder mixture. The decisive contribution into shrinkage during non-isothermal sintering of composite comes from the high-temperature stages with the maximum shrinkage rate at the temperatures 1,250 and 1,550 °C. It is found out that the regime of sintering the ultrafine PCPs (T = 1,600 °C, t = 1 h) allows producing composite ceramic materials with a porosity of Q ≈ (5–7) %, microhardness H $_{v}$ = 12.3 GPa, and crack resistance К $_{1c}$ = (10–11) MPa m$^{0.5}$.
Starting Page	1439
Ending Page	1445
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	115
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-10-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alumina toughened zirconia ceramics TG DSC Dilatometry Sintering Shrinkage Phase transformations Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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