The Osprey Preform Process

Evans, R. W.; Leatham, A. G.; Brooks, Roy L.

doi:10.1179/pom.1985.28.1.13

Cited by 74 publications

(11 citation statements)

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“…[1], in which the constant Z C1 is a function of the initial gas velocity. The initial gas velocity was assumed to be 200 m/s, which is within the gas velocity range of the USGA atomizer used in this study.…”

Section: A Atomization Gas Velocity Decay Formulationmentioning

confidence: 99%

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Modeling of solidification of molten metal droplet during atomization

Tsao

1997

Metall Mater Trans B

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A mathematical model to describe the solidification behavior of an atomized droplet during flight, in terms of nucleation temperature, recalescence temperature, nucleation position, solid fraction at nucleation temperature, and droplet temperature and velocity, is formulated. The concept of transient nucleation is applied to model the short nucleation event. A maximum droplet velocity exists, beyond which the droplet velocity shows an inflection phenomenon during the flight. The velocity of smaller droplets is higher at a shorter flight distance and lower at a longer flight distance. Variations of the gas flow patterns have more effects on smaller droplets, and the effects are more significant at a longer flight distance. A minimum surface heat-transfer coefficient exists as the droplet flies. Prior to nucleation or recalescence, smaller droplets have lower temperature at a given flight distance. Smaller droplets have lower nucleation temperature. Medium-size (around 80-m) droplets fly over the shortest flight distance before the nucleation starts. Smaller droplets have a larger solid fraction at the end of recalescence. Atomization gas has more effects on the droplet momentum than on the heat content of the droplet.

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Section: A Atomization Gas Velocity Decay Formulationmentioning

confidence: 99%

“…The droplets subsequently either solidify to become metal powder to be collected or deposit onto a collector to form a spray deposit. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The droplet, powder, and spray-deposit characteristics are all influenced by the solidification of the droplets during flight.…”

Section: Introductionmentioning

confidence: 99%

Modeling of solidification of molten metal droplet during atomization

Tsao

1997

Metall Mater Trans B

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“…In melt-spraying techniques, such as the Ospray process [79] or liquid dynamic compaction (LDC) [80], melts are atomized in a gas stream and deposited on cooled substrates. Isotropic magnetic Nd -Fe -B layers with grain sizes of 1 -20 mm are obtained.…”

Section: Rare Earth Metal -Iron -Boron Magnetsmentioning

confidence: 99%

Magnetic Materials

Ervens¹,

Wilmesmeier²

2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Forms of Magnetism in Matter 2.1. Diamagnetism 2.2. Paramagnetism 2.3. Ferromagnetism 2.4. Ferrimagnetism and Antiferromagnetism 3. Magnetic Quantities and Their Measurement 3.1. General 3.2. Parameters of Hard Magnetic Materials 3.3. Parameters of Soft Magnetic Materials 4. Hard Magnetic Materials 4.1. Classical Hard Magnetic Materials 4.1.1. Aluminum ‐ Nickel ‐ Cobalt Materials 4.1.2. Chromium ‐ Iron ‐ Cobalt Materials 4.1.3. Other Metallic Hard Magnetic Materials 4.1.4. Hard Ferrites 4.2. Modern Hard Magnetic Materials 4.2.1. Rare Earth Metal ‐ Cobalt Magnets 4.2.2. Rare Earth Metal ‐ Iron ‐ Boron Magnets 5. Soft Magnetic Materials 5.1. Classical Soft Magnetic Materials 5.1.1. Iron ‐ Silicon Materials 5.1.1.1. Non‐Oriented Electric Sheet 5.1.1.2. Grain‐Oriented Electric Sheet 5.1.2. Nickel ‐ Iron Materials 5.1.2.1. High‐Nickel Alloys 5.1.2.2. Medium‐Nickel Alloys 5.1.2.3. Low‐Nickel Alloys 5.1.3. Iron ‐ Cobalt Alloys 5.1.4. Soft Ferrites 5.1.5. Special Soft Magnetic Materials 5.2. Modern Soft Magnetic Materials 5.2.1. Powder Composite Materials 5.2.2. Rapidly Quenched Materials 5.2.2.1. Amorphous Magnetic Materials 5.2.2.2. Nanocrystalline Magnetic Materials 6. Applications 6.1. Applications of Hard Magnetic Materials 6.2. Applications of Soft Magnetic Materials

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“…The spray forming process, which has been recognized to be a novel process for manufacturing advanced materials [5][6][7][8][9][10][11][12][13][14], is also a RSP. Therefore, it is potentially suitable for synthesizing aluminum alloys with high silicon content.…”

Section: Introductionmentioning

confidence: 99%