A method for preparing spherical yttrium zirconium oxide nanopowder

By preparing spherical yttrium zirconium oxide nanoparticles using a high-temperature and high-pressure method, the problem of volume expansion in zirconia ceramics during sintering was solved, and the preparation of uniformly sized yttrium zirconium oxide powder was achieved. This improved the thermal shock resistance and flow properties of ceramics, making them suitable for high-end functional materials.

CN118344143BActive Publication Date: 2026-09-01CHINALCO GUANGXI NONFERROUS RARE EARTH DEV CO LTD
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Patent Information

Application Number
CN202410298730.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-03-15
Publication Date
2026-09-01
Estimated Expiration
2044-03-15

AI Technical Summary

Technical Problem

The volume effect caused by crystal transformation during the sintering process of zirconia ceramics leads to a decrease in thermal shock resistance and makes them prone to cracking. In addition, the uneven particle size of the existing powder makes the ceramic sheets easy to break.

Method used

Spherical yttrium zirconium oxide nanoparticles were prepared using a high-temperature and high-pressure method. By controlling the growth rate of crystal nuclei and adding dispersants, stable solid solutions or composites were formed. Combined with membrane filtration and spray granulation technology, spherical yttrium zirconium oxide powder with uniform particle size was prepared.

Benefits of technology

The thermal shock resistance and stability of zirconia ceramics are improved, and the prepared powder has uniform particle size and excellent flow properties, making it suitable for high-end functional materials such as dental materials and grinding zirconia beads.

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Abstract

This invention discloses a method for preparing spherical yttrium zirconium oxide nanopowder. The method involves adding a polyethylene glycol solution to a high-pressure reactor and heating it to 120°C. Then, a zirconium salt solution and a yttrium salt solution are simultaneously added and reacted. After the zirconium salt solution and yttrium salt solution are fed in, the reaction continues to obtain a mixture A. The mixture A is then heated to 60-90°C under stirring at 50-100 r / min, and ammonia water is slowly added to adjust the pH to 8-10, yielding a mixture B. Mixture B is then subjected to membrane filtration to remove impurities, followed by membrane concentration to obtain a concentrate. The concentrate is sent to a spray granulation tower for atomization granulation to obtain spherical yttrium zirconium oxide precursor powder. The yttrium zirconium oxide precursor powder is then calcined in a calcination furnace to obtain spherical yttrium zirconium oxide powder. This invention solves the problem that in the ceramic sintering process, zirconium oxide powder, due to poor powder flowability and uneven particle size, results in low density, easy cracking, and lack of toughness in the fired ceramic sheets.
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