Speaker
Description
In recent years, interest has grown in low-temperature ceramic sintering and fabrication of multi-materials for various devices. We have developed an acid-base chemical densification (ABCD) process capable of producing dense ceramic bulk materials at temperatures below 200ºC. This process applies the chemical reaction between metal oxide hydrous gels and alkaline hydroxide powders to nanoparticle synthesis and sintering. Utilizing highly reactive amorphous ZrO₂ gel as a raw material enables the application of the ABCD process to synthesize high-density bulk BaZrO₃, at the low temperatures of 100–150ºC. Furthermore, observation of the internal structure of BaZrO₃ prepared by this method revealed that extremely fine nanograins aggregate to form domains constituting the bulk structure. When this bulk material is subjected to high-temperature treatment in a high-concentration barium hydroxide solution or in a strong basic solution without barium, a dissolution-precipitation reaction occurs. The material does not dissolve as ions but instead disperses as particles in the liquid. This process converts bulk BaZrO₃ into powdered BaZrO₃ rather than directly dissolving the bulk material. This could be useful for reusing BaZrO₃ after device fabrication, such as in fuel cells. This process demonstrates the potential for a novel recyclable method that controls both bulk formation and powderization using the same alkaline solution.
| Professional Status of the Speaker | Senior Scientist |
|---|---|
| Invitation letter for visa | No |
| Interest in submitting a paper in a special issue of | Journal of the European Ceramic Society (Elsevier) |
