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Role of solvent composition and sintering time on the porosity of α‐alumina monoliths produced by freeze casting

da Silva, Saulo Lucas Pereira ; Faria, Anna Carolina Britto ; dos Santos, Giovana Magalhães ; Lima Ribeiro, Camila ; Aiube, Carlos Martins ; Souza, Rodrigo Nunes ; Assis Silva, João Paulo Santiago ; Athayde, Daniel Dornellas ; Sousa Lima, Luiz Fernando ; Mohallem, Nelcy Della Santina ; Silva, Alysson Martins Almeida

Journal of the American Ceramic Society, 2024-09, Vol.107 (9), p.6369-6387 [Revista revisada por pares]

Columbus: Wiley Subscription Services, Inc

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  • Título:
    Role of solvent composition and sintering time on the porosity of α‐alumina monoliths produced by freeze casting
  • Autor: da Silva, Saulo Lucas Pereira ; Faria, Anna Carolina Britto ; dos Santos, Giovana Magalhães ; Lima Ribeiro, Camila ; Aiube, Carlos Martins ; Souza, Rodrigo Nunes ; Assis Silva, João Paulo Santiago ; Athayde, Daniel Dornellas ; Sousa Lima, Luiz Fernando ; Mohallem, Nelcy Della Santina ; Silva, Alysson Martins Almeida
  • Materias: Aluminum oxide ; Camphor ; Compressive strength ; Densification ; Eutectic composition ; freeze casting ; Freezing ; Grain size ; Naphthalene ; naphthalene–camphor ; pore network model ; Porosity ; Sintering ; Sintering (powder metallurgy) ; Solvents ; Temperature control ; Tortuosity ; α‐alumina
  • Es parte de: Journal of the American Ceramic Society, 2024-09, Vol.107 (9), p.6369-6387
  • Descripción: The present study reports the investigation of the influence of naphthalene–camphor binary solvent and the densification process on the pore structure formation of α‐alumina monoliths using the freeze‐casting technique with a freezing temperature control mechanism. Freeze‐casting technique allowed a controlled production of monoliths with high porosity (65%–70%) and distinct pore morphologies based on the adjustment of solvent composition (hypoeutectic, eutectic, and hypereutectic) and sintering time. In general, the longer the sintering time, the greater the average pore diameter (8–10 µm), the larger the grain size (∼319–596 nm), the higher the material density (∼1450–1650 kg/m3), the lower the open porosity (∼60%–49%), the higher the closed porosity (5%–18%), and the greater the compressive strength of the monoliths (hypoeutectic: 23.56 MPa; eutectic: 4.81 MPa; hypereutectic: 23.49 MPa). The study also reveals that the solvent composition directly influenced the alignment of the pore structure, as the pores of the final monolith resemble frozen solvent crystals. Hydraulic tortuosity varied from 1.30 to 1.53 for selected samples. Finally, solvent composition and sintering time proved to be important parameters that should be considered in the manufacturing process of porous ceramic structures via freeze casting. The present study reports on the production of α‐alumina monoliths through the freeze‐casting technique with unprecedented temperature control (‐130°C), using different compositions of the naphthalene‐camphor mixture as a solvent and applying different sintering temperatures to the materials. The work reveals that changes in the solvent composition can promote the formation of different pore structure and affect their alignment. The sintering time, in turn, reveals impacts on both the porosity and mechanical properties of the materials. Therefore, variations in such parameters bring versatility and may open doors for the production of monoliths designed for specific applications.
  • Editor: Columbus: Wiley Subscription Services, Inc
  • Idioma: Inglés
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