Oxidation protective multilayer coatings for carbon–carbon composites

Smeacetto, Federico; Salvo, Milena; Ferraris, Monica

doi:10.1016/s0008-6223(01)00151-8

Cited by 214 publications

(58 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SiC and its oxidation have been widely studied for a range of applications, especially as a semiconductor for high-temperature, high-field, and high-power electronics, [9][10][11][12] and in oxidation-resistant coatings for high-temperature structural materials [13,14]. Similar to Si, SiC oxidation shows a linear-parabolic behavior.…”

mentioning

confidence: 99%

Competing atomic and molecular mechanisms of thermal oxidation—SiC versus Si

Shen

Tuttle

Pantelides

2013

Journal of Applied Physics

View full text Add to dashboard Cite

The oxidation of SiC and Si provide a unique opportunity for studying oxidation mechanisms because the product is the same, SiO 2 . Silicon oxidation follows a linear-parabolic law, with molecular oxygen identified as the oxidant. SiC oxidation obeys the same linearparabolic law but has different rates and activation energies and exhibits much stronger facedependence. Using results from first-principles calculations, we show that atomic and molecular oxygen are the oxidant for Si-and C-face SiC respectively. Comparing SiC with Si, we elucidate how the interface controls the competition between atomic and molecular mechanisms.Oxidation is a ubiquitous process that occurs in most solids including metals, insulators, and semiconductors. The atomic-scale processes that underlie oxidation are of fundamental interest as they control the quality of both the resulting oxide and its interface with the substrate.Furthermore, elucidation of these processes would also benefit applications as thermal oxidation is widely used to fabricate oxide films, such as gate dielectrics and insulating layers, in electronic devices, [1,2] in nanostructures, [3] and in applications of ceramics materials [4]. The best-known example is Si oxidation, which produces a high-quality oxide/semiconductor interface and is one of the most important techniques that enable semiconductor technology. Meanwhile, for materials used at high temperatures, stability against thermal oxidation is a major concern [5].Silicon and SiC provide a unique opportunity for investigating thermal oxidation because they have the same native oxide, SiO 2 . Si oxidation has been extensively studied and the kinetics has been well described by a model proposed by Deal and Grove,[6] where the oxidation time t and the oxide thickness x are related by: t = x 2 /B + x/(B/A).The parabolic rate B is related to the oxidant diffusivity D by:

show abstract

mentioning

confidence: 99%

Competing atomic and molecular mechanisms of thermal oxidation—SiC versus Si

Shen

Tuttle

Pantelides

2013

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…As reported in Ref. [13], the contact angle of liquid Si on C is near 08, so that the molten Si could impregnate into porosities on the surface of the C/C substrate at the heat retaining process at 1520 8C, and reacted with C/C substrate to form b-SiC [14], and a gradient buffer layer based on b-SiC and Si was formed on the surface of C/C substrate. Fig.…”

Section: Resultsmentioning

confidence: 65%

Oxidation behavior and kinetics of SiC/alumina–borosilicate coating for carbon–carbon composites

Luo

Chen

et al. 2008

Applied Surface Science

View full text Add to dashboard Cite

“…However, these works lack systematic studies of the effect of the gradient morphology on the obtained properties, when it was made clear that the properties directly reflect the concentration gradients of the constitutive elements (Nardi et al, 2014a). The attractiveness of such materials derives from their intrinsic ability to combine different and apparently incompatible features in a single body, making them appealing candidates for applications, such as coatings for either oxidation (Smeacetto et al, 2002), corrosion (Alegría-Ortega et al, 2012), or abrasion protection (Qureshi et al, 2013). Although a general increment of the mechanical properties (e.g., hardness) is desirable for many applications, a more precise design of the gradient morphology could lead to materials that perform better under loading conditions encountered during their operational life.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation of Functionally Graded Polymer Nanocomposites: Assessment of the Strengthening Parameters through Experiments and Modeling

et al. 2015

View full text Add to dashboard Cite

Nanoindentation tests were carried out on the surface of polymer nanocomposites exhibiting either graded or homogeneous distributions of Fe 3 O 4 @silica core-shell nanoparticles in a photocurable polymeric matrix. The results reveal a complex interplay between graded morphology, indentation depth, and calculated modulus and hardness values, which was elucidated through numerical simulations. First, it was experimentally shown how for small (1 µm) indentations, large increases in modulus (up to +40%) and hardness (up to +93%) were obtained for graded composites with respect to their homogeneous counterparts, whereas at a larger indentation depth (20 µm), the modulus and hardness of the graded and homogeneous composites did not substantially differ from each other and from those of the pure polymer. Then, through a material point method approach, experimental nanoindentation tests were successfully simulated, confirming the importance of the indentation depth and of the associated plastic zone as key factors for a more accurate design of graded polymer nanocomposites whose mechanical properties are able to fulfill the requirements encountered during operational life.

show abstract

Oxidation protective multilayer coatings for carbon–carbon composites

Cited by 214 publications

References 6 publications

Competing atomic and molecular mechanisms of thermal oxidation—SiC versus Si

Competing atomic and molecular mechanisms of thermal oxidation—SiC versus Si

Oxidation behavior and kinetics of SiC/alumina–borosilicate coating for carbon–carbon composites

Nanoindentation of Functionally Graded Polymer Nanocomposites: Assessment of the Strengthening Parameters through Experiments and Modeling

Contact Info

Product

Resources

About