Spreading and solidification of a highly undercooled Y3Al5O12 droplet impinging on a substrate

Nagashio, Kosuke; Kodaira, Kohei; Kuribayashi, Kazuhiko; Motegi, Tetsuichi

doi:10.1016/j.ijheatmasstransfer.2007.08.008

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Probably transient nucleation kinetics plays an important role in phase selection in the highly undercooled Cu-Ge liquid. Recently, Nagashio et al [19] found that the viscosity of undercooled Y 3 Al 5 O 12 was increased rapidly with increasing undercooling. If this is true also for the undercooled Cu-Ge liquid, transient effect on nucleation of the two phases will become important.…”

Section: Discussionmentioning

confidence: 99%

Phase Selection in Undercooled Melts of Peritectic Cu-Ge Alloys

Gao

Luo

2010

MSF

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Phase selection in undercooled melts of Cu-14.8Ge and Cu-18Ge compositions was investigated using the electromagnetic levitation technique in combination with substrate quenching and a drop tube. The results showed that the levitated and gas-cooled samples were all solidified into a microstructure consisting of primary -Cu plus peritectic -Cu5Ge. However, the samples quenched onto a copper substrate showed a segregation-free microstructure in the chilled zone, suggesting direct crystallization of the peritectic -Cu5Ge phase from a highly undercooled liquid. The Cu-18Ge samples quenched onto a glass substrate as well as those solidified in the drop tube also showed a segregation-free microstructure. An analysis of the nucleation kinetics revealed that the -Cu5Ge phase had a larger nucleation barrier than that of -Cu for all accessible undercoolings. It was suggested that phase selection in the undercooled Cu-Ge liquid might be controlled by transient nucleation kinetics.

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Section: Discussionmentioning

confidence: 99%

Phase Selection in Undercooled Melts of Peritectic Cu-Ge Alloys

Gao

Luo

2010

MSF

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“…Thermal analysis and measurements of the electric arc sprayed coatings and other thermal spraying processes by using the instruments such as thermocouple, pyrometer and infrared thermal imager were much concerned in pervious literatures [7][8][9][10][11]. However, precisely measuring the transient temperature variation of the coating/substrate is a real challenge, because the hot particles are added on the substrate or previously formed coating surface dynamically and randomly with a simultaneous movement of the spray gun [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of coating formation and transient heat transfer in the electric arc spray process

Chen¹,

Liang²,

Liu³

et al. 2010

International Journal of Heat and Mass Transfer

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Alumina Splat Investigation: Visualization of Impact and Splat/Substrate Interface for Millimeter-Sized Drops

Goutier¹,

Vardelle²,

Labbé³

et al. 2009

J Therm Spray Tech

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Coating adhesion-cohesion is strongly linked to the real contact between splats and substrate and between themselves. Unfortunately, the study of a single micrometer-sized splat interface, resulting from flattening and solidification processes and dynamic behaviors, all occurring in a few microseconds, is extremely complex. To overcome problems due to time and dimension scales, many previous works were devoted to the flattening of millimeter-sized drops. However, because of difficulties in producing millimeter-sized ceramic fully melted drops, most works were devoted to metals or alloys. The aim of this work is to present the development of a setup to understand the effect of substrate surface chemistry (oxidation, atom diffusion, etc.) on the flattening of a single millimeter-sized alumina drop. Thus, a new technique to produce such drops with different impact velocities has been developed. It consists in a rotating crucible heated by a transferred arc and a piston controlling substrate velocity and thus drop velocity relative to it. A fast camera (4000 image/s) that combines temperature evolution with a fast pyrometer (4000 Hz), allows following the drop flattening. This system enables the study of interface phenomena (such as desorption of adsorbates and condensates, and liquid drop/substrate wettability) and investigate the effects, at impact, of the kinetic energy or the Weber number of the flattening drop.

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Spreading and solidification of a highly undercooled Y3Al5O12 droplet impinging on a substrate

Cited by 4 publications

References 23 publications

Phase Selection in Undercooled Melts of Peritectic Cu-Ge Alloys

Phase Selection in Undercooled Melts of Peritectic Cu-Ge Alloys

Finite element modeling of coating formation and transient heat transfer in the electric arc spray process

Alumina Splat Investigation: Visualization of Impact and Splat/Substrate Interface for Millimeter-Sized Drops

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