Materiales compuestos C/SiC para aplicaciones estructurales de alta temperatura. Parte I: estabilidad termodinámica y química

Aparicio, M.; Durán, A.

doi:10.3989/cyv.2000.v39.i6.767

Cited by 9 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has been reported that in many processes, silica/carbon composites exhibit superior properties to their components separately, as result of a synergy between the properties of meso-ordered silica (elevated surface area and ordering in a wide range of porous structure) and the properties of active carbons (electrical conductivity, thermal stability, and easy modification of its surface chemistry by functionalization). 1 –7…”

Section: Introductionmentioning

confidence: 99%

The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase

Gerasymenko

Reyes

Espinosa

et al. 2019

Advanced Composites Letters

View full text Add to dashboard Cite

The objective of this study was to prepare composite materials based on mesoporous silica/carbon, functionalized with acid groups, and also to analyze its application in the adsorption of dyes. These materials were prepared in a simplified unconventional route. The carbon phase was generated by direct carbonization of organic surface-active templates, which are used in the synthesis of meso-ordered silicas. The resulting composite materials were characterized in terms of their structure, texture, chemical composition, and surface chemical reactivity. Data obtained demonstrate uniform and ordered porous structures of approximately 70–200 Å, with a developed surface area of approximately 400–500 m2 g−1 and a large total pore volume of approximately 1.0–1.5 cm3 g−1. The potential of synthesized composite materials functionalized by oxygenated groups as adsorbents of cationic dyes was analyzed, the values of the maximum adsorption capacity between 317 mg g−1 and 245 mg g−1 were obtained. The adsorbing properties of silica/carbon composite materials obtained in an unconventional method using an organic template as the only carbon source were compared with the properties of silica/carbon composite materials manufactured by the conventional method using external precursors of the carbon phase. It has been proved that composite materials synthesized using an unconventional procedure, despite the fact that they have a lower carbon phase content, exhibit adsorption properties that are comparable or superior to materials elaborated in the traditional way, removing up to 85–90% of methylene blue from water contaminated with dye.

show abstract

Section: Introductionmentioning

confidence: 99%

The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase

Gerasymenko

Reyes

Espinosa

et al. 2019

Advanced Composites Letters

View full text Add to dashboard Cite

show abstract

“…This is a one-step process that leaves the dimensions and geometry of the ceramic unaltered, creating materials that are well suited for use as catalyst supports in fuel cells, and in processes such as catalytic combustion or the purification of exhaust gases at high temperatures. Reaction mechanisms and equilibrium conditions can be inferred from the volatility diagrams of the various chemical species involved [3][4][5]. Here we present results for mullite (Al 6 Si 2 O 13 ), zircon (ZrSiO 4 ) and cordierite (Al 4 Mg 2 Si 5 O 18 ) ceramics, but the method can be extended to any other ceramic composed of two or more oxides with different stabilities under low-PO 2 atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Application of Volatility Diagrams in the Microstructured Surfacing of Oxide Ceramics

Souto

Rey

Franco

et al. 2006

MSF

View full text Add to dashboard Cite

Thermal treatment of ceramics composed of two or more oxides under controlled reducing conditions selectively volatilizes the less stable components, leaving microstructured surfaces consisting of the most stable of the original oxides. Volatility diagrams showing equilibrium partial pressures allow interpretation of this process and the calculation of equilibrium conditions for the different reactions involved. In this communication we present results for ceramics composed of mullite (3Al2O3·2SiO2), zircon (SiO2·ZrO2) and cordierite (2Al2O3·2MgO·5SiO2).

show abstract

“…Las propiedades de este material cerámico, y de los materiales compuestos de matriz SiC, hacen que se usen en la actualidad en multitud de aplicaciones: juntas mecánicas, válvulas… (componentes resistentes a la abrasión y a la corrosión); ventiladores cerámicos, elementos de calentamiento… (componentes resistentes a la temperatura); … (4,5).…”

Section: Introductionunclassified

Microestructura y propiedades mecánicas del SiC biomórfico obtenido a partir de eucalipto

Presas¹,

Pastor²,

LLorca³

et al. 2005

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

El desarrollo de materiales cerámicos con una estructura de tipo celular, similar a la del hueso o la madera, ha sido una cuestión que ha suscitado un gran interés en los últimos años. Su atractivo se debe al hecho de poseer una estructura porosa altamente interconectada de baja densidad, perfeccionada por la evolución. En el caso del SiC biomórfico (bio-SiC) el proceso de fabricación es sencillo: se piroliza una pieza de madera y a continuación se inyecta con silicio líquido, el material así obtenido es un compuesto Si/SiC en el que el SiC mimetiza la estructura de la madera original. En este trabajo se estudian las propiedades mecánicas del SiC biomórfico fabricado a partir de eucalipto (madera dura con una distribución bimodal de poros). Se ha estudiado el comportamiento mecánico del mismo (resistencia a compresión, resistencia a flexión, tenacidad de fractura y módulo de elasticidad) entre 25 y 1350 o C. Asimismo, se discute la relación entre el comportamiento mecánico del material y su microestructura. Palabras clave: Comportamiento mecánico, microestructura, SiC biomórfico, alta temperatura. Microestructure and mechanical properties of biomorphic SiC obtained from eucalyptusThe development of cellular ceramics with a biological structure, like bones and wood, has been a matter of interest in recent years. A low density highly interconnected structure, perfected by evolution, rises as the principal advantage of these materials. In the case of biomimetic SiC (biomorphic SiC, or bioSiC), the fabrication process technique is quite simple: a piece of wood is pyrolysed and is infiltrated with molten silicon after, the final product is a composite Si/SiC, which replicates the wood anisotropic microstructure This work focus on the mechanical properties of bioSiC fabricated using eucalyptus wood as precursor (hard wood with a bimodal channel distribution). It has been studied the mechanical behavior of this bioSiC (compression strength, flexure strength, fracture toughness and elastic modulus) between 25 and 1350 o C. It is also discussed the relationship between mechanical behavior of the material and its microstructure.

show abstract

Materiales compuestos C/SiC para aplicaciones estructurales de alta temperatura. Parte I: estabilidad termodinámica y química

Cited by 9 publications

References 34 publications

The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase

The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase

Application of Volatility Diagrams in the Microstructured Surfacing of Oxide Ceramics

Microestructura y propiedades mecánicas del SiC biomórfico obtenido a partir de eucalipto

Contact Info

Product

Resources

About