Abstract
Deposition of nanostructured multi-layered coatings on the basis of Zr-Y-0 was implemented by the pulse magnetron methods. Structural-phase states and morphology of the nanostructured coatings were investigated by SEM and the high-temperature TEM method. The high-temperature TEM revealed the presence of reversible phase transition of the tetragonal phase to the monoclinic phase, which can ensure stress relaxation and closure of surface cracks.
Highlights
Ceramics on the basis of Zr holds the leading place among fire-resistant constructional materials as it retains high mechanical properties up to 0.8...0.9 of the melting temperature of 3173 K
It is known that ZrO2 has three stable crystal structures depending on temperature: the monoclinicphase from the temperature of 1170 oС, the tetragonal phase within 1170 oC...2370 oC and the cubic phase from the temperature of 2370 oC
Analysis of published data shows that the yttrium oxide Y2O3 is commonly used as a stabilizing agent, which contributes to transformation of the tetragonal phase to monoclinic one at cooling
Summary
Ceramics on the basis of Zr holds the leading place among fire-resistant constructional materials as it retains high mechanical properties up to 0.8...0.9 of the melting temperature of 3173 K. Various methods and technologies were improved for production and stabilization of the tetragonal phase of the zirconium dioxide material [1,2]. The majority of such ceramic materials are developed on the basis of zirconium dioxide that is partially stabilized in the tetragonal phase [5,6,7].
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