Protective coatings for carbon fibers

Бакланова, Н. И.; Zima, T. M.; Титов, А. Т.; Исаева, Н. В.; Гращенков, Д. В.; Solntsev, S. S.

doi:10.1134/s0020168506070107

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…An oxide coating can be deposited onto carbon fibers by conventional techniques such as sol–gel 10,11 and chemical vapor deposition (CVD) 12 . Both techniques have the disadvantage that the carbon fiber is damaged by oxygen containing precursors or moisture, especially at temperatures exceeding 400°C.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the thickness of the coating plays an important role; it should be thick enough to protect the fiber but still thin enough to leave the tensile strength unaffected. 7 An oxide coating can be deposited onto carbon fibers by conventional techniques such as sol-gel 10,11 and chemical vapor deposition (CVD). 12 Both techniques have the disadvantage that the carbon fiber is damaged by oxygen containing precursors or moisture, especially at temperatures exceeding 4001C.…”

Section: Introductionmentioning

confidence: 99%

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Atomic Layer Deposition of Alumina onto Carbon Fibers

Roy

Baumann

Schulze

et al. 2011

Journal of the American Ceramic Society

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Bundles of carbon fibers were successfully coated with alumina by atomic layer deposition via sequential exposures to trimethylaluminum and water at 77°C. Fibers were not damaged by this procedure. Scanning electron microscopy (SEM) images revealed that individual filaments were coated separately with a smooth layer; no bridging of fibers was observed. Transmission electron microscopy (TEM) and SEM images indicate that the coating was conformal and adhered well to the fiber surface. The average deposition rate was 0.25±0.02 nm/cycle, calculated from SEM images obtained at various positions of the fibers and of fibers coated with various numbers of cycles. In addition to image analysis, the coating thickness was as well estimated from the elemental composition of selected parts of a fiber bundle that was coated by 450 cycles. Along the fiber axis, the weight fraction of aluminum of the coated fibers varied from 5.3 to 6.5 wt% and perpendicular to the bundle axis it varied from 4.8 to 7.4 wt%. This translates into a variation of the estimated coating thickness along the fiber from 166 to 126 nm and perpendicular to it from 114 to 183 nm. One can estimate independently an average coating thickness from the analysis of SEM images of this specific bundle of 126 nm. The alumina coating improved oxidation resistance of the carbon fiber significantly. The oxidation onset temperature was 600°C for fibers coated with a 30‐nm‐thick layer of alumina and increased gradually with increasing coating thickness up to 660°C at a thickness of 120 nm. On the other hand, uncoated fibers started to oxidize already at 300°C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition of Alumina onto Carbon Fibers

Roy

Baumann

Schulze

et al. 2011

Journal of the American Ceramic Society

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“…К методам модификации поверхности относится и нанесение различных веществ на поверхность волокна для формирования внешнего слоя. В литературе есть многочисленные примеры синтеза покрытий для углеродного волокна из различных керамик [4][5][6][7][8], в том числе есть исследования, показывающие [9][10][11], что оксид алюминия может использоваться как жаропрочное покрытие для УВ, и в то же время подложки из оксида алюминия отлично подходят для дальнейшей модификации, например, для получения массивов УНТ.…”

Section: с 5559unclassified

Preparation of Composite Threads and Hollow Ceramic Fibers Based on Carbon Fibre and Aluminum Oxide

Urvanov¹,

Pushina²,

Kazennov³

et al. 2021

ChemChemTech

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В настоящей работе изготовлены и исследованы композиционные нити состава «углерод-керамика». В качестве углеродной основы использованы волокна марки УКН-12к, полученные из полиакрилонитрила. Керамическое покрытие синтезировано из оксида алюминия. Изготовление композиционных нитей проводили в ходе повторяемого многостадийного процесса, включавшего приготовление водного золя гидроксида алюминия, его нанесение на углеродную основу и прокалку получаемых нитей в проточном реакторе в инертной атмосфере (Ar) при температуре 1000 °C. Методом рентгенофазового анализа было подтверждено, что получающееся из оксида алюминия керамическое покрытие состоит исключительно из его α-фазы. Следует отметить, что наличие оксида алюминия на поверхности углеродного волокна обеспечивает защиту углеродной основы и повышает смачиваемость, что значительно расширяет возможности как применения, так и модификации последнего. Согласно термогравиметрическим исследованиям, было установлено, что такое покрытие повышает термоустойчивость волокна на воздухе, а именно сдвигает температуру начала активного окисления на 120-150 °C вплоть до 550 °C. Также было обнаружено, что при более высоких температурах 800-1000 °C обеспечивается полное выгорание углеродной сердцевины, в результате чего формируются полые керамические волокна. Согласно данным растровой электронной микроскопии выявлено, что внутренний диаметр получаемых волокон соответствует диаметру использованного углеродного волокна и составляет в приведенных в работе примерах 5-7 мкм. Обнаружено, что морфология керамических волокон повторяет внешнюю структуру углеродного прекурсора, что можно использовать для изготовления как жгутов, так и войлока из полых керамических волокон, пригодных для изготовления мембран, высокотемпературных фильтров и композиционных материалов.

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“…The processes of protective coating formation on carbon fibers are investigated in [10]. There are studied the interface protective coatings, based on the refractory nanosized compounds of carbon bunches and ribbons.…”

Section: Coatings Obtained Using the Sol Gel Techniquementioning

confidence: 99%

Complex Protective Coatings for Graphite and Carbon-Carbon Composite Materials

Zmij¹,

Rudenkyi²,

Shepelev³

2015

MSA

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The objective of this review is to present the results on the production techniques, process parameters and compositions of heat-resistant coatings for graphite and carbon-carbon composites. The data reported concern the resistance of such protective coatings in air at temperatures up to 2273 K and in the high-speed flows of oxidizing gas media taking place in the spacecraft equipment. Coatings of this type, generally, have a multilayer structure based on the refractory compounds such as carbides, borides, silicides of transition metals and oxides with a high melting temperature. An efficient heat-resistant coating for carbon-based materials should be composed of three layers from which each fulfills its own function. The paper presents a new complex method for formation of heat-resistant coatings on the carbon-based materials. The method combines the vacuum-activated diffusion saturation in the presence of a liquid-phase and self-propagating high-temperature synthesis (SHS) simultaneously. * Corresponding author. V. I. Zmij et al. 880 ical impacts, ablation and electroerosion.However, under conditions of high temperatures, even above 773 K, C/C composites reveal comparatively low oxidation resistance, which restricts to a great extent their wide application in different fields, particularly, in the high-temperature equipment.At present, the problems of effective protection for carbon-based materials, being under conditions of different oxidizing media, are comprehensively discussed in the literature. A current state of this problem is under consideration in the review article [1]. The effective protection of C/C composites against oxidation can be provided with taking into account the following: use of such materials as oxides, carbides, nitrides, borides, silicides and their various compounds; deposition methods and conditions; thickness and crack resistance of coatings; material designing limiting because of the chemical activity of material reinforcement components; new approaches to the choice of a heat-resistant coating material. Main requirements to the carbon composites are: atmospheric oxidation resistance, thermal impact resistance, humidity resistance, and high mechanical strength. The methods of carbon-based material stabilization are based on different approaches: multilayer coating deposition, formation of glass-forming or metallic coatings subjected to chemical transformations by thermal treatment, and glass-forming compound impregnation. In the above-mentioned review, one offers to use for carbon-based material protection the refraction metals such as W

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Protective coatings for carbon fibers

Cited by 13 publications

References 8 publications

Atomic Layer Deposition of Alumina onto Carbon Fibers

Atomic Layer Deposition of Alumina onto Carbon Fibers

Preparation of Composite Threads and Hollow Ceramic Fibers Based on Carbon Fibre and Aluminum Oxide

Complex Protective Coatings for Graphite and Carbon-Carbon Composite Materials

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