Reactive Ultra-fast High-temperature Sintering (UHS) of alumina from boehmite
This work explores the consolidation of alumina via an innovative procedure: the reactive Ultra-fast Hightemperature Sintering (r-UHS) from boehmite precursors. The method exploits Joule heating to achieve rapid densification without applied pressure and using extremely low-cost equipment. Crystallo...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/411293 |
| Acceso en línea: | http://hdl.handle.net/10261/411293 https://api.elsevier.com/content/abstract/scopus_id/105021363927 |
| Access Level: | acceso abierto |
| Palabra clave: | Boehmite Microstructure Reactive UHS Ultra-cheap alumina α-Al2O3 |
| Sumario: | This work explores the consolidation of alumina via an innovative procedure: the reactive Ultra-fast Hightemperature Sintering (r-UHS) from boehmite precursors. The method exploits Joule heating to achieve rapid densification without applied pressure and using extremely low-cost equipment. Crystallographic analysis reveals the phase evolution from -AlOOH to -Al2O3 at 730 ◦C, and to fully crystallized -Al2O3 above 1300 ◦C after 30 s. Densification up to 93% relative density was achieved in just 60 s at 1800 ◦C, with longer dwell times showing negligible improvement. The formation of a fully sintered surface shell hinders densification, suggesting that higher densities may be achievable with optimized heating schedules. The resulting samples show competitive hardness and structural homogeneity. Unlike flash sintering, r-UHS does not require stringent electrical contact, offering a scalable and robust route for fast advanced ceramic fabrication. Its simplicity, speed, low energy demand, and minimal equipment cost highlight its viability for alumina manufacturing. |
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