Okayama University of Science–SSHD SPS Patent Technology Presented at International Conference
Space Seed Holdings Inc. (Headquarters: Minato-ku, Tokyo; CEO: Kengo Suzuki, “the Company”) announces that results from its joint research with Okayama University of Science (Location: Okayama City, Okayama Prefecture; President: Hiroyuki Hirano) on a “next-generation Spark Plasma Sintering (SPS) system” were presented as a poster at the 29th International Conference on High Pressure Science and Technology (AIRAPT-29).
Building on the SPS technology under co-development by the Company and Professor Yoshihisa Mori’s team at Okayama University of Science, the work demonstrates the effectiveness of an ultra-high-pressure Spark Plasma Sintering (UHP-SPS) platform that integrates a Palm-type cubic anvil with SPS.
・Conference: 29th International Conference on High Pressure Science and Technology (AIRAPT-29)
・Presentation title: Reduction of the Glass Formation Temperature of SiO₂ Using Ultra-High-Pressure SPS
Key Research Points
・Transparency at low temperature: In contrast to the ≥1,700 °C typically required for transparent ceramics, the team achieved large-area, highly uniform transparent bodies from amorphous SiO₂ powder at ~600 °C under 2.4 GPa.
・Uniform fields: Applying a Palm-type cubic anvil ensured homogeneous pressure/temperature fields, improving the recovery of large, uniform samples compared with piston–cylinder configurations.
・Leveraging current-assisted effects: The synergy of pulsed current (Joule heating) and high pressure promoted transparency reactions that are difficult to realize with external heating alone.
Scientific Background and Technical Challenge
SPS enables rapid, comparatively low-temperature densification and is effective for nanostructure control and non-equilibrium phase formation. However, conventional SPS is typically limited to ~0.1–0.15 GPa (≤0.5 GPa at most), imposing physical constraints on difficult-to-sinter systems and new-phase discovery.
Based on a jointly filed patent technology targeting current-assisted sintering under ~10 GPa hydrostatic pressure, the Company and Professor Mori’s group have been concretizing a UHP-SPS concept centered on a Palm-type cell. The present SiO₂ transparency result represents a technical milestone toward full implementation.
Technical Overview and Novelty
・Toward 10 GPa: A design philosophy aiming for current-assisted sintering at pressures >100× those of conventional SPS.
・Reproducibility and scalability: Cell optimization supports Φ ≤ 10 mm specimens with a pathway to scale-up.
・Modular architecture: Benchtop-oriented modularization to enable distributed, multi-site experimentation.
・Add-on deployment: A roadmap for retrofitting existing SPS systems, facilitating adoption in active laboratories.
Application Potential and Industrial Impact
The results are expected to advance multiple materials domains, including:
・Transparent ceramics: Optical components, laser/sensor windows.
・Ultra-hard and functional materials: Nano-polycrystalline diamond, c-BN, h-BN; heat-resistant ceramics; novel thermoelectrics.
・Quantum and energy materials: Non-equilibrium phases, transparent conductive oxynitrides, high-density solid electrolytes, next-generation battery materials.
Next Steps
・System evaluation: Continue prototyping and thermo-electrical endurance testing of the Palm-anvil cell.
・Materials expansion: Extend beyond SiO₂ to functional oxides, nitrides, and carbon systems to validate transparency, densification, and phase-transition control.
・Path to implementation: Explore equipment licensing, contract sintering/materials-library services, and university-origin startup creation via GAP-type funding.
・Dissemination: Continue reporting results at domestic and international conferences and through peer-reviewed publications to help establish a new industrial benchmark in SPS.
About Space Seed Holdings Inc.
Space Seed Holdings Inc. is a space-focused deep-tech venture builder with the mission of “Turning Science Fiction into Nonfiction.” The company engages in investment, research, and venture creation, centered on operating the “Fermentation and Longevity Fund,” which supports the social implementation of fermentation and longevity technologies to address societal challenges. In collaboration with diverse stakeholders, Space Seed Holdings aims by 2040 to assemble the technologies necessary for sustained human habitation in space.
https://ss-hd.co.jp