MOCVD of alumina-silica oxidation resistant coatings on carbon fibers

Landry, Christopher C.; Barron, Andrew R.

doi:10.1016/0008-6223(94)00162-s

Cited by 28 publications

(4 citation statements)

References 16 publications

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“…Silicon carbide is one of the most commonly used materials for protective coatings due to its resistance to temperature variations, high corrosion resistance, and good wear resistance at high temperatures in an oxidizing environment [2][3][4]. SiC thin films and coatings on high-temperature materials can be deposited by chemical vapor deposition (CVD) [5][6][7][8], metal organic chemical vapor deposition (MOCVD) [9], and reactive chemical vapor deposition (RCVD) [10]. SiC coatings are also deposited by high-speed plasma deposition [11][12][13], thermal evaporation [14], and magnetron sputtering [15,16].…”

Section: Introductionmentioning

confidence: 99%

Novel Method for Deposition of Gas-Tight SiC Coatings

et al. 2023

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A new high-temperature method for the deposition of gas-tight silicon carbide protective coatings with low gas permeability has been developed. The free carbon atoms form during the high-temperature pyrolysis of hydrocarbon molecules. In turn, carbon reacts with molten silicon contained in the subsurface substrate layers and/or with silicon vapor. The source of silicon vapor serves the molten silicon in the heated zone of a reactor furnace. Such coatings effectively protect SiC-C-Si and SiC-C-MoSi2 ceramics, carbon–carbon composite materials, structural graphite, and refractory metals and alloys from oxidation. The conducted tests show the high thermal oxidation and thermal shock stability of deposited protective coatings, as well as their good adhesion to the substrates.

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Section: Introductionmentioning

confidence: 99%

Novel Method for Deposition of Gas-Tight SiC Coatings

et al. 2023

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“…Alumina-silica coatings are well known to have excellent properties such as wear resistance, anti-corrosion, good thermal and chemical stability, excellent optical property and durability, so have been widely used as functional and protective coatings for various kinds of materials. [1][2][3][4][5] Some researchers have been studying the hybrid alumina-silica structure, but mostly focusing on the structure after calcination at high temperature. [6][7][8][9][10][11][12][13] At high calcination temperature, the structure and property of alumina-silica depend on the preparation method and the Si/Al ratio.…”

Section: Introductionmentioning

confidence: 99%

Structure characterization of alumina–silica coatings prepared on polyimide substrate by sol–gel

Zhang¹,

Mao²,

Ma³

2014

Materials Science and Technology

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Alumina–silica coatings were prepared on polyimide substrate by sol–gel method using aluminium isopropoxide and tetraethyl orthosilicate as the precursors. The molar ratios of Si/Al were designed as 1∶3, 1∶1 and 3∶1. The surface morphology and structure of as-deposited coatings were investigated by various complementary analysis techniques. The results indicate that all silica–alumina coatings show a smooth and dense surface and have a thickness of ∼400 nm. After treatment at 230°C, the alumina–silica coatings are a diphase structure of AlOOH and amorphous silica, the same as the corresponding gel powders. Moreover, after calcination at 550°C, the alumina–silica gel powders still remain a diphase structure, but AlOOH transforms into γ-Al2O3. The Si content has no obvious effect on the phase structure. However, increasing the Si/Al ratio in the as deposited coatings causes the binding energies of Si 2p, Al 2p and O 1s peaks to shift to higher energy.

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“…If the fiber is strongly bonded to the matrix of a CMC, cracks propagating through the matrix will break the fiber easily. [9][10][11] These two techniques are usually very suitable for the deposition of thin layers onto fibers; especially sol-gel methods are fast and affordable. 5,6 All the above mentioned concerns have been addressed by coating the fibers with thin layers of protective materials.…”

Section: Introductionmentioning

confidence: 99%

Atomic layer deposition onto carbon fiber: From single layer deposition via multilayer structure to metal oxide microtubes

Knohl

Roy

Goedel

et al. 2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Articles you may be interested inAtomic layer deposition TiO2-Al2O3 stack: An improved gate dielectric on Ga-polar GaN metal oxide semiconductor capacitors J. Vac. Sci. Technol. B 32, 060602 (2014); 10.1116/1.4897919 Improved oxidation resistance of organic/inorganic composite atomic layer deposition coated cellulose nanocrystal aerogels Surface modification of nitrogen-doped carbon nanotubes by ozone via atomic layer deposition J. Vac. Sci. Technol. A 32, 01A124 (2014); 10.1116/1.4847995Engineering titanium and aluminum oxide composites using atomic layer deposition Layers of alumina, titania and double layers of alumina/titania (and reverse) were deposited onto bundles of carbon fibers in an atomic layer deposition process. Scanning electron microscopy (SEM) images of the coated carbon fibers revealed that each fiber of a bundle was coated homogenously and separately and that no bridges were formed between the fibers. Transmission electron microscopy and SEM images showed that the coating was conformal, uniform, had a good adhesion to the fiber surface and that the morphology of the coating surface was similar to that of fiber surface. In case of double layers, the average deposition rate of coatings did not depend on the sequence of layer deposition. After coating, the carbon fibers were selectively removed by thermal oxidation in air at temperatures of 550 C and 900 C, leading to metal oxide microtubes.

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MOCVD of alumina-silica oxidation resistant coatings on carbon fibers

Cited by 28 publications

References 16 publications

Novel Method for Deposition of Gas-Tight SiC Coatings

Novel Method for Deposition of Gas-Tight SiC Coatings

Structure characterization of alumina–silica coatings prepared on polyimide substrate by sol–gel

Atomic layer deposition onto carbon fiber: From single layer deposition via multilayer structure to metal oxide microtubes

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