Method for synthesizing cerium-doped stable tetragonal zirconia nanopowder by sol-gel method

Abstract

The invention relates to a method for synthesizing cerium-doped stable tetragonal-phase zirconia nanopowder by a sol-gel method. The method comprises the following steps: 1) selecting a certain amount of zirconium sources, cerium sources, surfactants and complexing agents, and respectively dissolving in a mixed solvent of water and ethanol to obtain mixed liquids; 2) dropwise adding the mixed liquids of zirconium sources, cerium sources and surfactants to the complexing agent liquid, and sufficiently stirring to obtain a mixed liquid; 3) heating the mixed liquid in a water bath under the condition of stirring, wherein the temperature of the water bath is 90-95 DEG C; 4) placing the gel obtained by heating in the water bath into an oven and drying at 120 DEG C; and 5) pulverizing the dried gel and calcining at 700-800 DEG C for 2 hours to obtain the final product. The synthesis process of the product is simple, the product is spherical particles of which the diameter is 10-20nm and has the characteristics of narrow particle size distribution range, excellent performance and low production cost.

Description

technical field [0001] The invention relates to the preparation of zirconia nano powder, in particular to a process method for synthesizing cerium-doped stable tetragonal phase zirconia nano powder by a sol-gel method. Background technique [0002] Zirconia ceramics is a very important structural and functional material with excellent physical and chemical properties. It has important application value and broad application prospects in the fields of biomedicine, catalysis, sensing, solid electrolyte, high temperature refractory and so on. In recent years, the application of tetragonal zirconia ceramics in the fields of oral restoration materials and artificial joints has attracted more and more attention from researchers due to its good mechanical properties, chemical stability, and biocompatibility. focus of research. [0003] Under normal pressure, zirconia ceramics have three crystal forms: monoclinic phase (m phase), tetragonal phase (t) and cubic phase (c), and the th...

AI Technical Summary

Problems solved by technology

Recent studies have shown that when zirconia-based ceramics are used for a long time in a low temperature and humid environment, especially when they are used as oral materials and joint materials are eroded by body fluids, H 2 O molecules can be filled by ZrO 2 surface oxygen vacancies into ZrO 2 In the surface lattice, the filling of water molecules leads to the shrinkage of the zirconia lattice, which generates tensile stress on the surface of the grains and destroys the tetragonal phase, resulting in the transition from the tetragonal phase to the monoclinic phase, from the tetragonal phase (t phase) to the monoclinic phase. The transformation of (m-phase) leads to the deterioration of its mechanical properties, which seriously restricts the use of zirconia-based ceramics

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