Protective Al-rich mullite coatings on Si- based ceramics against hot corrosion at 1200°C

Kulkarni, T.; Wang, H.Z.; Basu, Soumendra N.; Sarin, V.K.

doi:10.1016/j.surfcoat.2010.11.055

Cited by 24 publications

(4 citation statements)

References 18 publications

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“…Due to its chemical and thermal stability, aluminum oxide is also a good corrosion inhibitor and thermal barrier. An example is the improvement of the durability of Si-based ceramics as a protective coating [5]. Moreover, thin film aluminum oxide surfaces have recently received much attention as supports for metal clusters which serve as model systems for understanding heterogeneous catalytic processes [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of oxygen gas pressure on the kinetics of alumina film growth during the oxidation of Al(111) at room temperature

Cai

Zhou

Müller³

et al. 2011

Phys. Rev. B

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We have studied the effect of oxygen pressure on the self-limiting oxidation of an Al(111) surface at room temperature for oxygen pressures from 1×10 -8 to 5 Torr. Using x-ray photoelectron spectroscopy measurements we monitor the oxidation kinetics and the oxide film thickness for different oxidation times and pressures. After a rapid initial growth stage, the oxide film reaches a saturated thickness, which depends on the oxygen pressure. The kinetic potential, oxide growth rate, oxide film limiting thickness, and the density of oxygen anions on the oxide surface are determined by the measured oxidation kinetics. These quantities show a Langmuir isotherm dependence on the oxygen gas pressure.

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Section: Introductionmentioning

confidence: 99%

Effect of oxygen gas pressure on the kinetics of alumina film growth during the oxidation of Al(111) at room temperature

Cai

Zhou

Müller³

et al. 2011

Phys. Rev. B

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“…The corrosive attack on ceramics occurs preferentially at high‐energy sites such as grain boundaries 22 . The thermodynamic activity of silica is reduced in mullite, and the impurity in the mullite ceramic exists almost at the silica‐rich grain boundary, which can reduce the activation energy 23 . Thus, mullite shows more CO tolerance than the glass phase, which may be attributed to the difference in the activation energy 19 .…”

Section: Resultsmentioning

confidence: 99%

Insight into the corrosion failure of mullite thermal insulation materials in carbon monoxide

Xiang

et al. 2021

Int J Applied Ceramic Tech

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The service condition of mullite thermal insulation materials is complicated, the effects of carbon deposition are always considered the primary cause of damage to mullite ceramic in carbon monoxide atmosphere. In the present study, mullite thermal insulation material was subjected to a carbon monoxide atmosphere at 1100°C–1400°C. The thermodynamics stability, phase composition, and microstructure of the mullite thermal insulation material were analyzed. Furthermore, the effects of carbon monoxide corrosion on thermal shock resistance and compressive creep behavior at high temperatures were evaluated. The carbon content in the mullite‐based insulation material is below 0.02% after treatment at 1100°C–1400°C. After treatment at 1400°C, most areas in the specimen comprised corundum and glass phase, and K, Na, Ca, Mg, and Fe were detected as impurities, leading to the improvement of cold crushing strength after 20 thermal shocks but a remarkable recession in high‐temperature compressive creep.

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“…Deposition was carried out in a hot-wall CVD reactor using the system of gases AlCl 3 -SiCl 3 -CO 2 -H 2 . Details of the experimental procedures are described in the references [6].…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…As a consequence of more than two decades of focused research and development, it has been demonstrated that EBCs are effective tools to protect Si-based substratesespecially SiC/SiC Ceramic Matrix Composites (CMCs)-from the severe pitting corrosion and recession typical of gas turbine applications [2][3][4][5][6][7][8][9][10]. Today, EBC-coated SiC/SiC CMCs are used in high pressure shrouds in 7F gas turbines as well as hot components of the LEAP aircraft engine [7,8].…”

Section: Introductionmentioning

confidence: 99%

Nanoscratch Testing of 3Al2O3·2SiO2 EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength

et al. 2023

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In this study, the structural integrity of mullite (3Al2O3·2SiO2) films, deposited on silicon carbide (SiC) substrates using chemical vapor deposition (CVD), was investigated via increasing load nanoscratch tests. The films were configured by mullite columns of stoichiometric composition growing from a silica-rich layer in contact with the SiC substrate. Controlled damage was induced in the 3Al2O3·2SiO2 films at relatively low scratch loads. Radial and lateral cracking were applied until final delamination and repeated chipping were achieved as the load increased. The intrinsic integrity of the 3Al2O3∙2SiO2 film and the performance of the coated 3Al2O3·2SiO2/SiC system, regarded as a structural unit, were analyzed. With the aid of advanced characterization techniques at the surface and subsurface levels, the configuration and morphology of the damage induced in the coated system by the nanoscratch tests were characterized, and the scratch damage micromechanisms were identified. Finally, the adhesion of the film, in terms of energy of adhesion and interfacial fracture toughness, was determined using different models proposed in the literature. The results from this investigation contribute to the understanding of the mechanical performance and structural integrity of EBC/SiC-based systems, which over the past few years have increasingly been implemented in novel applications for gas turbines and aircraft engines.

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Protective Al-rich mullite coatings on Si- based ceramics against hot corrosion at 1200°C

Cited by 24 publications

References 18 publications

Effect of oxygen gas pressure on the kinetics of alumina film growth during the oxidation of Al(111) at room temperature

Effect of oxygen gas pressure on the kinetics of alumina film growth during the oxidation of Al(111) at room temperature

Insight into the corrosion failure of mullite thermal insulation materials in carbon monoxide

Nanoscratch Testing of 3Al2O3·2SiO2 EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength

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