(1) High-Strain Rate Superplastic Ceramics (Figure: Top) We have discovered for the first time that even in highly rigid and brittle materials like ceramics, local plastic relaxation due to dislocation activity within grains plays an important role as a relaxation mechanism for superplastic deformation, similar to that in metallic alloys. By optimizing microstructures, we have realized high-strain rate superplastic ceramics (Patent No. 3837516) that can be processed with excellent strength comparable to metals even at deformation speeds 100 to 1000 times faster than conventional materials. (2) High-Strength, Broadband-Transparent Composite Ceramics (Figure: Middle) By optimizing the fine grain and composite structure through pulsed current sintering, we achieved high-strength, broadband-transparent ceramics that combine excellent light transmission and mechanical properties. Furthermore, we fabricated composite ceramics by laminating textured alumina on a spinel surface, achieving not only excellent broadband (400 nm-6 μm) in-line transmittance but also a 2.0-2.5 times improvement in mechanical properties compared to conventional materials (Patent No. 2023166658).

(3) Extending the life time of ceramics by healing cracks damage under a strong electric field (Figure: lower)
We have discovered a new healing technology (Patent No. 2022161388) that allows for the rapid healing of cracks and other damage of ceramics by applying a strong electric field treatment. This not only recovery the strength to its initial state after the healing treatment, but also enables the recovery (rejuvenation) of the material, thereby extending its life time of the ceramics. Recycle and reuse of ceramic components are difficult, and even if possible, they consume a lot of energy. This healing technology aims to reuse the components through repair, rather than discarding the used ceramic components and manufacturing new ones. If reuse becomes possible, it is expected to contribute to achieving carbon neutrality, which is a social issue, and realizing a material recycling society with 3Rs (Recycle, Reuse, Reduce).