Spheroidization of Irregularly Shaped Metal Powders

Wahll, M. J.; Orsdel, J. R. Van; Fischer, R. B.

doi:10.1179/pom.1961.4.8.005

Cited by 5 publications

(3 citation statements)

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“…In 1936, Vogt was is.sued a patent on a similar process,in which glass spheres were made by dropping pieces of glass th~ough a hot zone and a subsequent cooling zone. ( Other investigators have been able to rnake spherical particles of metals and carbides by such processes asdroppingthroughahotzone(shottower), (5) centrifugal melting, (6) and powder metallurgical processes. 7The very high temperatures of plasmas have recently been applied to the melting and spheroidizing of refractory particles.…”

Section: Literature Reviewmentioning

confidence: 99%

PREPARATION OF (Th,U)C$sub 2$ FUEL PARTICLES FOR THE HTGR

Goeddel¹,

Shoemaker²

1962

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This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usefulness of the Information contained In this report, or that the use of any Information, apparatus, method, or process disclosed In this report may not infringe prlvotPly nwnPrl rtght11 ; nr B. Assumes any liabilities with respect to the use ol, or tor damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the CommisMion" includes any employee or contractor of the Commission, or employee of such cont.rAct.or, to thr. r.xtr.nt that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor. This report has been reproduced directly from the best available copy.

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Section: Literature Reviewmentioning

confidence: 99%

PREPARATION OF (Th,U)C$sub 2$ FUEL PARTICLES FOR THE HTGR

Goeddel¹,

Shoemaker²

1962

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“…Radio frequency (RF) induction plasma technology can be used to achieve this through in-flight heating and melting of feed material particles followed by rapid cooling and solidification under controlled conditions. The material melts and is reformed into spherical particles (Wahll, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…To achieve optimum flow characteristics and high packing density, an ideal AM metal powder should be highly spherical in shape with no satellites (finer particles). Increased particle sphericity can improve powder feeding, resulting in smoother layers, improved packing density, increased heat conduction in the powder bed and an enhanced melting profile (Wahll, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Spheroidised tungsten carbide metco 32c powder using radio frequency plasma

Dire

Bissett

Delport

et al. 2022

SATNT

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Metco 32C is a coarse grey powder, which mostly consists of tungsten carbide and cobalt; with small traces of nickel, chromium, boron, iron silicon and carbon. Metco 32C powder has the role of supporting oxidation and corrosion resistance at high temperatures as well as increasing the hardness of the coated materials. The spheroidal morphology of Metco 32C improves flowability during layer application methods such thermal spraying. There has been a growing interest in the development / improvement of methods producing powders of cast tungsten carbide and other high-melting-point materials of uniform composition, characterised by a high sphericity of the particles and having higher physical-mechanical properties. Spherical particles are generally preferred in the additive manufacturing process as they pack together for uniform powder bed density, better flowability in machinery, eliminate internal cavities and fractures resulting in a better quality of final product. Similarly, thermal spraying processes also require dense, spherical particles to ensure consistency and reproducibility of the feeding mechanism as well as interaction between the feedstock and thermal spraying heat source. The process of transforming irregularly shaped powder particles into spherical shapes is known as the spheroidisation process and this can be achieved by plasma spheroidisation. It was found that the spheroidisation ratio of the powder increased as the plasma plate power increased. A decrease in density was observed as plasma power increased. The spheroidised powders have a smaller particle size distribution (PSD) than the feed powders (un-spheroidised). The XRD results showed that as the plasma plate power increased the WC phase composition decreased, subsequently the phase composition of W2C increased.

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