Comparison of plasma-sprayed alumina coatings by RF and DC plasma spraying

Blanchi, L.; Grimaud, A.; Blein, F.; Lucchese, Paul; Fauchais, Pierre

doi:10.1007/bf02648529

Cited by 58 publications

(22 citation statements)

References 14 publications

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“…Then residual thermal stress in the solidified splat would be lower when the substrate temperature is high, and formation of micro crack would be less. 9) This might be the reason why almost no cracks were observed in the coatings sprayed to the hot substrate.…”

Section: Open Porositymentioning

confidence: 99%

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

2005

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Zircon is widely used in industrial field as a refractory material, because of its excellent mechanical and chemical properties at high temperature. Authors have been studied on the effect of the heat treatment on the structure and properties of plasma sprayed zircon coating as a candidate for an environmental barrier coating (EBC). In this study, very dense coating with excellent adhesive strength was successfully obtained by optimizing the spray process. Substrate temperature is one of the dominant factors to control porosity and crack formation in the coating. The higher substrate temperature, obtained by plasma pre-heating, resulted in lower porosity and less cracks. Open porosity of the coating was quite low, about 2%, in the coatings obtained especially above 1473 K of the substrate temperature.

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Section: Open Porositymentioning

confidence: 99%

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

2005

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“…Typical velocities for plasma-sprayed particles are in the range of 100 -400 m/s; however, the small particle sizes presently used may result in increased velocity. 13 The viscosity of melted alumina ranges from 0.15 P at 2500°C to 0.5 P at 2050°C. 27 Thus, the † Joint Committee for Powder Diffraction Standards, Swarthmore, PA (now International Centre for Diffraction Data (ICDD), Newtown Square, PA).…”

Section: (1) Microstructure Of Individual Splatsmentioning

confidence: 99%

“…Surface roughness has been shown to influence the degree of splashing that is observed in plasma-sprayed coatings. 12,13,19,30,31 In one paper, Fukanuma 19 modeled the influence of surface roughness on the final splat geometry. If the impinging velocity is sufficiently great, the melted particle can interact with the surface and splashing can occur as surface asperities scatter the impinging molten drop.…”

Section: (3) Effect Of Splat Geometry On Surface Roughnessmentioning

confidence: 99%

“…6 -10 As such, researchers have examined the effects of particle viscosity, 11,12 velocity, [13][14][15][16][17] and temperature 17,18 on splat morphology. Studies also have focused on the influence of the substrate on splat morphology; these studies included the effects of surface roughness, 12,13,19 temperature, 13,15,20 -22 and material type. 13,23 To date, however, few studies 15,24 have been performed that relate the integrity of the individual splats to the physical and mechanical properties of the resulting coating.…”

Section: Introductionmentioning

confidence: 99%

“…Studies also have focused on the influence of the substrate on splat morphology; these studies included the effects of surface roughness, 12,13,19 temperature, 13,15,20 -22 and material type. 13,23 To date, however, few studies 15,24 have been performed that relate the integrity of the individual splats to the physical and mechanical properties of the resulting coating. In the research that is reported here, the properties of individual splats have been correlated with the microstructure, surface roughness, and flexural strength of SPPS alumina coatings.…”

Section: Introductionmentioning

confidence: 99%

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Role of Lamellae Morphology on the Microstructural Development and Mechanical Properties of Small‐Particle Plasma‐Sprayed Alumina

Trice

Faber

2000

Journal of the American Ceramic Society

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The influence of spray parameters on the microstructure and flexural strength of plasma-sprayed alumina was investigated. Coatings were applied using a small-particle plasma spray (SPPS) method, which is a recently patented process that allows submicrometer-sized powders to be sprayed. Using identical starting powders, coatings that were produced using two distinctly different spray conditions exhibited significant differences in both microstructure and strength. Scanning electron microscopy investigations of single lamellae (or splats) revealed that, for one spray condition, melted alumina particles will splash when they contact the substrate. The morphology of the splats that comprised the subsequent layers of the coating also were highly fragmented and thinner than lamellae formed under "nonsplashing" spray conditions. The surface roughness was strongly dependent on the morphology of the lamellae; increased roughness was noted for fragmented splats. Thick coatings that were comprised of splashed splats developed a unique microstructural feature that was responsible for the observed increase in roughness. These microstructural differences greatly influenced the flexure strength, which varied from 75 ؎ 21 MPa for the nonsplashing spray condition to 17 ؎ 2.4 MPa for the "splashing" condition.

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Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

Gaudin,

Despres,

Dolmaire

et al. 2023

Ceramic Coatings for High-Temperature Environments

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Comparison of plasma-sprayed alumina coatings by RF and DC plasma spraying

Cited by 58 publications

References 14 publications

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

Role of Lamellae Morphology on the Microstructural Development and Mechanical Properties of Small‐Particle Plasma‐Sprayed Alumina

Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

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