Boron nitride nanosheets as an effective strategy against the slow crack growth and hydrothermal ageing in zirconia composites
This paper explores the effectiveness of boron nitride nanosheets in preventing the premature failure of yttria-stabilized tetragonal zirconia ceramics, particularly in humid environments. A simple, low-cost and scalable technique -shear exfoliation in a kitchen blender- was used to prepare BNNS, an...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/174555 |
| Acceso en línea: | https://hdl.handle.net/11441/174555 https://doi.org/10.1016/j.oceram.2025.100816 |
| Access Level: | acceso abierto |
| Palabra clave: | Boron nitride nanosheets Yttria tetragonal zirconia Composite materials Low temperature degradation |
| Sumario: | This paper explores the effectiveness of boron nitride nanosheets in preventing the premature failure of yttria-stabilized tetragonal zirconia ceramics, particularly in humid environments. A simple, low-cost and scalable technique -shear exfoliation in a kitchen blender- was used to prepare BNNS, and pure zirconia and composites with 1, 2.5 and 5 vol. % BNNS were spark plasma sintered. Accelerated hydrothermal ageing experiments in autoclave revealed a remarkable improvement of low temperature degradation resistance in all the composites. Fracture toughness and slow crack growth of the composites with 1 and 2.5 vol. % BNNS were evaluated by bending tests performed in notched specimens. Although the composites presented fracture toughness values similar to those of the reference zirconia, an increase of ∼18 % on crack-tip toughness was achieved. Similar R-curves evaluated in air and in oil-impregnated 2.5 vol. % BNNS composites revealed a limitation of stress-assisted corrosion by water in zirconia, thanks to the BNNS incorporation. |
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