Mullite/ZrO2 coatings produced by flame spraying

Cano, Camilo I.; Garcia, Ephrahim; Fernandes, Alcides; Osendi, M.I.; Miranzo, P.

doi:10.1016/j.jeurceramsoc.2008.02.021

Cited by 28 publications

(4 citation statements)

References 20 publications

(22 reference statements)

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“…[79][80][81][82][83] Advanced gas turbine running at higher temperatures is used for power generation to meet increased demand of electricity. The wide range of materials used in these composite coatings includes mullite/alumina, mullite/zirconia, mullite/silicon carbide, mullite/molybdenum.…”

Section: Application Of Mullite In Coating Technologymentioning

confidence: 99%

Solgel‐Processed Mullite Coating—A Review

Roy¹,

Das²,

Maitra³

2014

Int J Applied Ceramic Tech

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Mullite is one of the popular ceramic materials for different engineering applications due to some of its important properties which include good thermal and chemical stability, high creep resistance, etc. Mullite synthesized by solgel process generally requires lower temperature for processing and generate product with better homogeneity and more purity compared with other conventional processes. Coating of solgel‐derived mullite film on surface of a ceramic substrate can improve its thermomechanical properties, making it suitable for applications in different aggravated conditions. This study embarks a comprehensive review on synthesis, characterization and applications of solgel‐derived mullite coating.

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Section: Application Of Mullite In Coating Technologymentioning

confidence: 99%

Solgel‐Processed Mullite Coating—A Review

Roy¹,

Das²,

Maitra³

2014

Int J Applied Ceramic Tech

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“…[1][2][3][4][5] This technique provides thick coating layers over a large surface at a high deposition rate and improves surface properties of substrates such as appearance, adhesion, wettability, wear resistance, and thermal resistance. While many factors affecting coating quality and corresponding reliability have been reported in the literature, [6][7][8][9] detailed technologies and fundamentals to control those factors are not comprehensively understood yet. In the thermal spray coating process, adhesive and cohesive quality between molten droplets and target substrates can be sufficiently controlled by three representative factors as follows; thermal properties, impact dynamics and operating conditions, and surface characteristics.…”

Section: Introductionmentioning

confidence: 99%

Flattening Characteristics of Ni<SUB>20</SUB>Cr Thermal-Sprayed Coating Layers on Preheated SCM415 Substrates

Shin

Lee

Wi³

et al. 2011

Mater. Trans.

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The preheating effect of SCM415 steel substrates on the flattening behavior of Ni 20 Cr flame-sprayed particles was investigated in a temperature range from 278 K to 523 K. In the present study, we calculated the particle temperature and velocity distributions of the continuous and discrete phases before collision with the substrate by using a computational fluid dynamics (CFD) code of Fluent (ver. 6.3.26). Particle velocity and gas temperature decreased rapidly in the radial direction while the particles traveled toward the substrate, suggesting that substrate size and distance from the nozzle should be carefully controlled to improve coating quality. The conventional flame spray gun was used to accelerate molten particles and K-type thermocouples were used to monitor the substrate temperature during a preheating process. Commercially available nickel-based Ni 20 Cr particles with a mean diameter of 45 mm and 20 mm were used for experiments to examine the particle size effect on the coating characteristics. Herein we present FE-SEM images of coated layers on the substrates. As the substrate preheating temperature increased, the flatter surface morphology was seen at the interface between substrate and coating layer because of better wetting and corresponding higher shear adhesion strength. Moreover, the splat morphology was significantly dependent on the particle size.

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“…Consequently, functionally graded materials, with discrete or continuous variations in composition and structure, showing corresponding changes in their properties have been introduced to applications where a certain functional requirement of a component is position dependent [5][6]. Mullitebased multilayer architectures for instance, with compositional grading between the mullite bond coat and a yttria stabilized zirconia (YSZ) top coat (showing excellent resistance to H 2 O vapours attack) might offer a solution to ease their coefficient of thermal expansion (CTE) mismatch induced stress [7]. A proper understanding of the mechanical properties such as the elastic modulus, hardness or plastic/elastic recovery work serves for an efficient design of such refractory oxide multilayers.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Air-Plasma Sprayed Functionally Graded YSZ-Mullite Environmental Barrier Coatings: A Study Via Instrumented Indentation

Cojocaru¹,

Granados²,

López³

et al. 2010

International Thermal Spray Conference

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Mullite (Al6Si2O13) is the basis of efficient environmental barrier coatings (EBCs) for protecting Si-based ceramic matrix composites (CMCs) selected to replace specific hot-section metallic components in advanced gas turbines. Furthermore, YSZ-mullite multilayer architectures with compositional grading between the bond coat and YSZ top coat were envisioned as solutions to ease their coefficient of thermal expansion (CTE) mismatch induced stress. Consequently, a proper understanding of the mechanical properties such as the elastic modulus, hardness or plastic/elastic recovery work serve for an efficient design of such refractory oxide multilayers. In this work, three different mullite powder morphologies (fused and crushed, spray-dried and freeze-granulated) were employed. Using depth-sensing indentation with loads in the range 100 – 500 mN, the role of the microstructure and morphology of the powder feedstock on the mechanical behaviour of air plasma sprayed mullite bond coats deposited on SiC Hexoloy substrates was investigated. Fully crystalline as-sprayed mullite coatings were engineered under controlled deposition conditions. Mechanical properties were measured for the as-sprayed coatings as well as for coatings heat-treated at 1300°C, in water vapour environment, for periods up to 500 h. Both E and H values of the coatings are found to be highly dependent on the morphology of the starting powders.

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Mullite/ZrO2 coatings produced by flame spraying

Cited by 28 publications

References 20 publications

Solgel‐Processed Mullite Coating—A Review

Solgel‐Processed Mullite Coating—A Review

Flattening Characteristics of Ni<SUB>20</SUB>Cr Thermal-Sprayed Coating Layers on Preheated SCM415 Substrates

Mechanical Behaviour of Air-Plasma Sprayed Functionally Graded YSZ-Mullite Environmental Barrier Coatings: A Study Via Instrumented Indentation

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