Propiedades mecánicas de SiC biomórfico poroso

Abstract

Se han estudiado carburos de silicio biomórficos (bioSiC) fabricados mediante infiltración reactiva de silicio líquido en una preforma de carbón de origen vegetal. Se obtiene así una cerámica porosa de SiC con silicio remanente en sus poros. Este silicio puede alterar considerablemente las propiedades mecánicas de los bioSiC. Este trabajo preliminar se centra en el estudio de las propiedades mecánicas de los bioSiC fabricados a partir de preformas de haya, eucalipto y pino, tras reacción con una disolución de HF y HNO 3 que elimina ostensiblemente el silicio residual. Las propiedades mecánicas a altas temperaturas fueron estudiadas a partir de ensayos de compresión a velocidad de deformación constante. La caracterización microestructural del material resultante, antes y después de los ensayos mecánicos, fue realizada mediante Microscopía Electrónica de Barrido (MEB).Palabras clave: SiC, biomórfico, alta temperatura, propiedades mecánicas. Mechanical Properties of Porous Biomorphic SiCBiomorphic SiC (bioSiC) materials fabricated by silicon infiltration of chescoal preforms have been studied. As a result of this process, a porous SiC ceramics with remnant silicon partially filling pores is obtained. This remnant silicon can considerably alter the mechanical properties of the bioSiC but it can be effectively removed by reaction with a mixture of HF and HNO 3 producing a clean pororus bioSiC. In this work the comparison of the mechanical properties of bioSiC from preforms of beech, eucalyptus and pine, with and without remanent silicon is studied. High temperature mechanical properties were studied from deformation tests in compression at constant strain rate. Microstructural characterization of the samples, before and after the mechanical tests, was performed by scanning electron microscopy (SEM).

The synergistic effect of VEGF and biomorphic silicon carbides topography onin vivoangiogenesis and human bone marrow derived mesenchymal stem cell differentiation

“…The presence of functional groups on the ceramic surfaces, hydroxyl and SiO (figure 1(C)) detected by the FT-IR analysis, could be explained by the oxidation of the unreacted silicon atoms after the infiltration process of carbon performing with molten silicon [47]. Hydroxyl groups can increase the bioSiC loading ability through the interaction with numerous therapeutic molecules.…”