Artículo
Boric acid (H3BO3) as flux agent of clay-based ceramics, B2O3 effect in clay thermal behavior and resultant ceramics properties
Hernández, Maria Florencia
; Violini, María Agustina
; Serra, Maria Florencia
; Conconi, María Susana; Suarez, Gustavo
; Rendtorff Birrer, Nicolás Maximiliano
Fecha de publicación:
09/2019
Editorial:
Springer
Revista:
Journal of Thermal Analysis and Calorimetry
ISSN:
1388-6150
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Ceramic materials were satisfactorily processed through a dry scalable process from binary clay–boric acid (H3BO3) mixtures. Relevant thermal parameters were established by a multitechnique approach that included thermogravimetric, differential thermal analysis, dilatometric analysis and structural and microstructural characterization of fired samples. Both clay and boric acid thermal processes were described and correlated. The experimental textural properties evidenced a porosity decrease with sintering temperature and acid addition in the 1100–1300 C range. The amount of glass was strongly increased by the boron oxide incorporation, confirming its fluxing capacity. X-ray diffraction, supplemented by Rietveld–Le Bail refinement, verified the presence and thermal evolution of crystalline and glassy phases. The observed microstructure was similar to other clay-based ceramics, with quartz, cristobalite and mullite grains imbibed in the silicabased glassy phase. The observed mullite phase was actually a boron mullite solid solution. Boric acid was confirmed as an adequate boron oxide source. The present study gives information for further clay-based materials design with boron oxide as fluxing agent. The dry route hypothesis was confirmed. Both formulation and firing programs can be optimized. High boron addition (5 mass%) is not recommended due to the observed partial rehydration.
Palabras clave:
BORIC ACID
,
CLAY-BASED MATERIAL
,
DRY ROUTE
,
THERMAL BEHAVIOR
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Identificadores
Colecciones
Articulos(CETMIC)
Articulos de CENTRO TECNOL.DE REC.MINERALES Y CERAMICA (I)
Articulos de CENTRO TECNOL.DE REC.MINERALES Y CERAMICA (I)
Citación
Hernández, Maria Florencia; Violini, María Agustina; Serra, Maria Florencia; Conconi, María Susana; Suarez, Gustavo; et al.; Boric acid (H3BO3) as flux agent of clay-based ceramics, B2O3 effect in clay thermal behavior and resultant ceramics properties; Springer; Journal of Thermal Analysis and Calorimetry; 139; 3; 9-2019; 1717-1729
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