Characterisation of sol-gel-derived silica films

McDonagh, Colette; Sheridan, F.; Butler, Thomas M.; MacCraith, Brian D.

doi:10.1016/0022-3093(95)00488-2

Cited by 128 publications

(89 citation statements)

References 8 publications

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“…This process allows one to engineer multicomponent oxide systems on a molecular level and manipulate process parameters to achieve desired products with specific properties. This process is characterized by hydrolysis, condensation reactions, as well as its potential to apply a uniform coating on complex shapes using different methods, including dip-coating, spin-coating and spray [13][14][15] . Because of its low processing temperature, higher purity, and homogeneous materials, the sol-gel method has been intensely studied as an alternative process for preparing ceramic and glass materials for a wide variety of applications, such as in the field of bioceramics (bioactive glass) 13,[16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

et al. 2007

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Sol-gel film in the SiO 2 -CaO-P 2 O 5 system was prepared from TEOS, TEP, alcohol and hydrated calcium nitrate in an acidic medium. The coatings were deposited on stainless steel using the dip-coating technique. After deposition, the composite was submitted to heat treatment, at different temperatures and exposure times to investigate the influence of such parameters on the surface morphology of the composite. The coated surfaces were characterized by AFM, SEM and FTIR. The present study showed that the formation of different textures (an important parameter in implant fixation) could be controlled by temperature and time of heat treatment.

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Section: Introductionmentioning

confidence: 99%

Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

et al. 2007

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“…Oxide coatings are the most investigated coating systems [5][6][7][8]. One advantage of the wet coating technique is that molecular structures, developed by chemical synthesis, can be used to develop new properties either to preserve theses structures on the surface, or to develop new desired molecular structures by heat-treatment and subsequent chemical reaction on the surface.…”

Section: Introductionmentioning

confidence: 99%

Infrared Spectroscopy of Titania Sol-Gel Coatings on 316L Stainless Steel

Vasconcelos¹,

Costa²,

Nunes³

et al. 2011

MSA

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“…Un mŽtodo sencillo y eficaz de preparaci-n de recubrimientos de s'lice pura de hasta 2 µm de espesor es el proceso sol-gel (20,(50)(51)(52)(53)(54)(55)(56)(57). Para aumentar el espesor de estas capas pueden combinarse las soluciones sol-gel con part'culas submicromŽ-tricas de s'lice (58,59).…”

Section: 21-capa Internaunclassified

Materiales compuestos C/SiC para aplicaciones estructurales de alta temperatura. Parte II: Sistemas de protección contra la oxidación

Aparicio¹,

Durán²

2001

Bol. Soc. Esp. Ceram. Vidr.

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La utilizaci-n de los materiales compuestos C/SiC en aplicaciones estructurales a alta temperatura est ‡ limitada por la elevada velocidad de oxidaci-n de la fibra de carbono a temperaturas superiores de 450¼C. En esta segunda parte del trabajo se realiza una revisi-n de las posibilidades de protecci-n contra la oxidaci-n de estos materiales, incluyendo inhibidores, modificaci-n superficial del material compuesto, recubrimientos e infiltraci-n previa del sustrato. La eficacia de los inhibidores de la reacci-n de oxidaci-n est ‡ restringida a temperaturas de hasta 850¼C, mientras que la modificaci-n superficial del material compuesto da lugar a capas delgadas y poco resistentes a los ciclos tŽrmicos. En cambio, los recubrimientos son el mŽto-do m ‡s empleado porque permiten combinar composiciones y espesores de capa muy variados. La estructura multicapa es especialmente interesante en el caso de aplicaciones con intervalos de temperatura de trabajo amplios y cuando el material va a estar sometido a choques tŽrmicos. La infiltraci-n de la porosidad del sustrato s-lo mejora ligeramente la resistencia a la oxidaci-n del material compuesto C/SiC al reducir los caminos de acceso del ox'geno a las fibras de carbono. Sin embargo, la infiltraci-n complementa en gran medida las propiedades antioxidantes de los recubrimientos en el intervalo de bajas temperaturas, ya que Žstos suelen presentar fisuras abiertas por diferencias de dilataci-n tŽrmica con el sustrato. Palabras clave: C/SiC, materiales compuestos, protecci-n antioxidante C/SiC composites for high temperature structural applications. Part II: Oxidation protection systemsThe fact which currently excludes the use of C/SiC composites in high temperature structural applications is the high oxidation rate of carbon fibres at temperatures higher than 450¼C. In this second part of the paper, a review of the different oxidation protection systems, including inhibitors, surface modification of composites, coatings and previous infiltration of the substrates, has been carried out. The addition of inhibitors reduces the oxidation rate, but only up to 850¼C, while the surface modification of composites leads to thin coatings with poor thermal shock resistance. On the other hand, the external layers are the most usual method employed because allows combining different compositions and thicknesses. The multilayer coatings are especially interesting in applications with wide temperature range and thermal shocks requirements. The infiltration of substrate porosity improves slightly the oxidation resistance of C/SiC composites reducing the oxygen accessibility to carbon fibres. However, the infiltration complements very well the oxidation protection performance of a coating system at low temperature, since these normally present open cracks due to mismatch between coating and substrate thermal expansion coefficients. Keywords: C/SiC, composites, oxidation protection 1.-INTRODUCCIîNLas importantes propiedades de los materiales compuestos C/SiC, propiedades mec ‡nicas a alta tempe...

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Characterisation of sol-gel-derived silica films

Cited by 128 publications

References 8 publications

Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

Infrared Spectroscopy of Titania Sol-Gel Coatings on 316L Stainless Steel

Materiales compuestos C/SiC para aplicaciones estructurales de alta temperatura. Parte II: Sistemas de protección contra la oxidación

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