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Experimental Investigation of Phase Equilibria in the ZrO 2 –TiO 2 –MgO System
Author(s) -
Saenko Ivan,
Tsukrenko Viktoria,
Ilatovskaia Mariia,
Pavlyuchkov Dmytro,
Savinykh Galina,
Fabrichnaya Olga
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800655
Subject(s) - materials science , differential thermal analysis , eutectic system , scanning electron microscope , analytical chemistry (journal) , isothermal process , phase (matter) , ternary numeral system , tetragonal crystal system , solubility , ternary compound , thermal stability , microstructure , ternary operation , crystallography , diffraction , metallurgy , chemical engineering , thermodynamics , chemistry , inorganic chemistry , composite material , physics , organic chemistry , chromatography , engineering , optics , computer science , programming language
Phase equilibria in the ZrO 2 –TiO 2 –MgO system are studied experimentally using X‐ray diffraction (XRD), scanning electron microscopy combined with dispersive X‐ray spectrometry (SEM/EDX), and differential thermal analysis (DTA). Based on the obtained experimental data, isothermal sections of the ZrO 2 –TiO 2 –MgO system at temperatures 1530, 1680, and 1880 K are established. Wide extension of stability of Zr 1‐ x Mg x O 2‐ x phase with fluorite structure (C ZrO 2 ) into ternary system is revealed. Very limited solubility of MgO is found in β‐(Zr x Ti 1‐ x ) 2 O 4 and tetragonal (Zr 1‐ x Ti x )O 2 phase (T ZrO 2 ), while more substantial solubility of ZrO 2 is found in the intermediate compounds of the TiO 2 –MgO system (Mg 2 TiO 4 , MgTiO 3 , and MgTi 2 O 5 ). Low temperature ternary compound similar to δ‐phase Y 4 Zr 3 O 12 is revealed at 1530 K. Differential thermal analysis indicated that this δ‐phase is stable up to 1664 K. Temperatures and compositions of three eutectic reactions are experimentally measured by DTA and ex situ analysis of the sample microstructures after melting using SEM/EDX.