Influence of the velocity of plasma-sprayed particles on splat formation

Fantassi, S.; Vardelle, Michel; Vardelle, Armelle; Fauchais, Pierre

doi:10.1007/bf02645868

Cited by 74 publications

(36 citation statements)

References 9 publications

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“…High-speed, two-color pyrometry has been used to obtain splat temperature variation during impact of plasmasprayed particles [13][14][15]. In this method, radiation emitted by the spreading splat is recorded at two different wavelengths; assuming gray-body emission, the splat temperature is calculated from the ratio of the intensities of radiation collected.…”

Section: Introductionmentioning

confidence: 99%

Thermal contact resistance between plasma-sprayed particles and flat surfaces

McDonald

Moreau

Chandra

2007

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Thermal contact resistance between plasma-sprayed particles and flat surfaces

McDonald

Moreau

Chandra

2007

International Journal of Heat and Mass Transfer

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“…Experimental studies have shown that many factors influence the spreading, fragmentation, and splashing of plasmasprayed particles impacting a surface [1][2][3][4][5][6]. Fantassi et al [2] varied the impact velocity of plasma-sprayed zirconia particles landing on smooth stainless steel substrates and found that the diameter of flattened splats increased as impact velocity increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of substrate oxidation on spreading of plasma-sprayed nickel on stainless steel

McDonald¹,

Moreau²,

Chandra³

2007

Surface and Coatings Technology

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Plasma-sprayed, molten nickel particles (∼ 60 μm diameter) were photographed during impact on oxidized 304L stainless steel surfaces that were maintained at either room temperature or at 350°C. Steel coupons were oxidized by heating them at different temperatures. A fast chargecoupled device (CCD) camera captured time-integrated images of the spreading splat. A two-color pyrometer collected thermal radiation from particles and recorded the evolution of their temperature after impact. Molten nickel particles impacting on oxidized steel at room temperature fragmented significantly, while heating the surfaces produced splats with disk-like morphologies. Impact on steel that was highly oxidized induced the formation of finger-like splash projections at the splat periphery. Thermal contact resistance between splats and non-heated oxidized steel was calculated from splat cooling rates and found to decrease as the degree of oxidation increased. On heated, oxidized steel thermal contact resistance was much lower and did not change significantly with the degree of oxidation. It was concluded that thermal contact resistance was largely influenced by adsorbates on the steel surface that evaporated when the surface was heated or oxidized.

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“…The value of the impact velocity can be determined using a measurement system presented elsewhere. 12,14) Disk splats are preferable for coating formation because the layering of disk splats is accompanied by smaller and fewer pores than those of splashed splats. The latter splat morphology reduces the coating performance, 15) although there are no splashed splats in the present study because of our use of a preheated substrate.…”

Section: Splat Morphology With Different Particle Sizesmentioning

confidence: 99%

Microstructure of Plasma-Sprayed Cast Iron Splats with Different Particle Sizes

et al. 2003

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The superior wear-resistant property of cast irons is closely linked with their microstructure, in which graphite formation in plasmasprayed cast iron coatings causes distinct characteristics owing to its self-lubricating property. Since the solidification rate generally affects graphite formation, the optimum in spray parameters such as substrate temperature, ambient pressure, particle size and spray distance is required to slow down the solidification rate, as well as to improve the adhesive strength of splats. In this study, cast iron splats were induced on an aluminum alloy substrate by plasma spraying using alloyed cast iron powder high in silicon and aluminum in a low pressure argon atmosphere. Then, the effects of particle size on the microstructure and adhesive strength of splats were investigated by introducing the correlation between the solidification rate and the microstructure. Spraying with large particles leads to an increase in the number fraction of disk splats and a slight decrease in their adhesive strength. Cross-sectional observations reveal fine graphite growing in splats nearly perpendicular to the substrate surface.

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Influence of the velocity of plasma-sprayed particles on splat formation

Cited by 74 publications

References 9 publications

Thermal contact resistance between plasma-sprayed particles and flat surfaces

Thermal contact resistance between plasma-sprayed particles and flat surfaces

Effect of substrate oxidation on spreading of plasma-sprayed nickel on stainless steel

Microstructure of Plasma-Sprayed Cast Iron Splats with Different Particle Sizes

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