A mullite oxidation protective coating on SiC coated carbon/carbon composites by hot dipping

Zhang, Bo; Huang, Jianfeng; Ouyang, Haibo; Cao, Liyun; Li, Cuiyan

doi:10.1016/j.ceramint.2016.08.044

Cited by 40 publications

(11 citation statements)

References 17 publications

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“…37 SiC particles were chosen because the mullite/SiC system is of interest for preventing the oxidation of SiC in high temperature steam oxidative environments. 8,[18][19][20][21]23 A 10 nm film of mullite ALD was deposited on these particles and annealed at 1500°C to crystallize the film.…”

Section: Ald Of Mullitementioning

confidence: 99%

“…Mullite also exhibits low oxygen permeability and is chemically stable in most environments. [15][16][17] These properties make mullite a promising material for EBCs, 8,[18][19][20][21][22][23] and as such mullite coatings have been previously used for high-temperature applications such as furnace components and protective coatings on C/ C-SiC panels of space vehicles for protection during reentry. 17 Previous experimental studies have used CVD and plasma-spraying to deposit lm thick mullite films onto SiC.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

et al. 2018

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Oxidation resistant, thin, pinhole‐free, crystalline mullite coatings were deposited on zirconia and silicon carbide particles using atomic layer deposition (ALD). The composition of the films was confirmed with inductively coupled plasma optical emission spectroscopy (ICP OES), and the conformality and elemental dispersion of the films were characterized with transmission electron microscopy (TEM) and energy dispersive X‐ray spectroscopy (EDS), respectively. The films are deposited on the particle surface with a deposition rate of ~1 Å/cycle. The elemental concentration of aluminum relative to silicon in the film was determined to be 2.68:1 which agrees closely with the ratio of stable 3:2 mullite (2.88:1). A high‐temperature anneal for 5 hours at 1500°C was used to crystallize the films into the mullite phase. This work represents the first deposition of mullite films by ALD. The mullite and alumina‐coated particles were exposed to high‐temperature steam for 20 hours at 1000°C to assess the oxidation resistance of the films, which reduced the oxidation of silicon carbide by up to 62% relative to uncoated particles under these conditions. The activation energy of oxygen diffusion in the films was determined with density functional theory, and the computational results aligned well with the experimental outcomes.

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Section: Ald Of Mullitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

et al. 2018

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“…Throughout the past researches of SiC coatings, different kinds of composite coatings like SiC/ZrC, SiC/ZrB 2 , SiC/mullite, etc., have been designed and prepared to protect different carbon substrates. Different methods or technologies have also been invested in order to get perfect and effective SiC coatings including sol‐gel, chemical vapor infiltration, pack cementation, chemical vapor deposition (CVD), metal‐organic chemical vapor deposition, and so on.…”

Section: Introductionmentioning

confidence: 99%

Dual layer SiC coating on matrix graphite sphere prepared by pack cementation and fluidized‐bed chemical vapor deposition

et al. 2017

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A dual layer silicon carbide (SiC) coating including inner porous SiC (p-SiC) layer and outer dense SiC (d-SiC) layer was fabricated on the matrix graphite (MG) spheres of high-temperature gas-cooled reactor fuel elements by pack cementation and fluidized-bed chemical vapor deposition process to improve the oxidation-resistant property. Microstructure of the coating demonstrates different density and structure of the two SiC layers with no obvious boundaries between them. Weight gain curves of oxidation tests at 1773 K for 200 hours show that the coating could effectively protected the MG sphere by isolating the air infiltration with p-SiC layer as the main functional layer and d-SiC layer as the transition layer to improve the bond strength. Due to the transition function of p-SiC layer, the coated spheres could understand more than 50 times thermal shocking tests from 1773 K to room temperature with no stress cracking.

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“…However, mullite is an attractive engineering material as it has low thermal expansion and conductivity, high creep resistance, and corrosion stability together with suitable strength and fracture toughness, and is one of the crystalline phases most frequently found in the final phase composition of both traditional ceramics and new inorganic functional materials . The significant role of mullite in various materials has been reported in the large number of publications in recent years …”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8] The significant role of mullite in various materials has been reported in the large number of publications in recent years. [9][10][11][12][13][14][15][16][17] Mullite whiskers, a special morphology of mullite crystal, have been considered as reinforcements in the high-temperature composites and porous ceramics for its excellent performance. 3,8,18,19 Various processing methods have been reported for preparing mullite whiskers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

Zhang

et al. 2017

Int J Applied Ceramic Tech

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Mullite whiskers are potential candidates for improving the mechanical and thermal properties of ceramic, glass, and composite material. In this work, well‐developed whisker‐shaped mullite has been produced by adding tribasic calcium phosphate (Ca3(PO4)2) into kaolin before calcining in air. In the raw kaolin, rod‐like mullite crystal of ~0.5‐1.0 μm length and ~0.05‐0.2 μm diameter formed at 1350°C, and mullite whiskers were not be observed; however, by doping 6 wt% Ca3(PO4)2 into kaolin, mullite whiskers of ~5.5 μm length and ~0.05‐0.10 μm diameter grew at 1250°C. The formation of high aspect ratio of mullite whiskers can probably be explained by the synergistic effect of P2O5 and CaO, resulting in the formation of liquid phase with a relatively higher content of Si and a lower viscosity at low temperature of 1250°C, which facilitates the growth of mullite displaying acicular morphology. The results are of interest in producing high aspect ratio of mullite whiskers from kaolin at reduced calcination temperatures.

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A mullite oxidation protective coating on SiC coated carbon/carbon composites by hot dipping

Cited by 40 publications

References 17 publications

Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

Dual layer SiC coating on matrix graphite sphere prepared by pack cementation and fluidized‐bed chemical vapor deposition

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

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