Formation of irregular particles during centrifugal atomization of AZ91 alloy

Angers, R.; Tremblay, R.; Dubé, D.

doi:10.1016/s0167-577x(97)00072-4

Cited by 23 publications

(34 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A higher disc speed exerts more centrifugal force and energy on the liquid metal film spreading on the surface of the disc and consequently finer particles are obtained [16]. This result is consistent to those previously reported by researchers for the atomization of tin [2], magnesium alloy [9], aluminum [17] and lead-free solder alloy [18]. It is noted that there is a deviation of the experimental result from the predictions using Equation 1.…”

Section: A Effect Of Atomizer Disc Speedsupporting

confidence: 89%

“…The oxide film would prevent spheroidization of the melt droplets during solidification [17], [18]. Moreover, Angers et al [9] reported that during centrifugal atomization of AZ91 alloy the irregular particles did not form by an atomization mechanism but by fragmentation of a layer of the atomized melt which solidified at the surface of the rotating disc. This phenomenon could be eliminated by preheating the disc and limiting convection cooling of the disc by the surrounding gas [9].…”

Section: B Trajectory Of Dropletmentioning

confidence: 99%

“…The molten metal forms a thin film on the surface of the disc, breaks up to small droplets and solidifies into particles [7]. The atomization can be occurred in three typical modes: direct drop formation (DDF), ligament disintegration (LD) and film disintegration (FD) which is dependent upon the process parameters and resulted in metal powder with different size and morphology [8], [9]. Droplet diameter (D) of particulate metal can be predicted by Eq (1) [1].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Design and Development of a Centrifugal Atomizer for Producing Zinc Metal Powder

Sungkhaphaitoon¹,

Plookphol²,

Wisutmethangoon³

2012

IJAPM

View full text Add to dashboard Cite

Abstract-In the present work a preliminary design of a centrifugal atomizer for producing zinc metal powder was studied. In the design process, the consumed power and the atomizing disc size were first estimated. The trajectory of flying melt droplet from the edge of atomizer disc and the temperature profile were predicted using a concept of heat transfer in an external flow for calculating the size of atomizer chamber. A simple laboratory-scale atomizer was built. The performance of the atomizer was studied by using pure zinc metal as a model material. The effects of rotating disc speed on median particle size, particle size distribution and standard deviation, production yield, and morphology of the atomized zinc powder were investigated. The atomization was carried out using graphite flat disc, melt pouring temperature, preheating disc temperature and melt feed rate of 40 mm, 550 °C, 300 °C and 50 kg/h, respectively. The atomizer disc speeds were varied from 10,000 to 30,000 rpm. It was evidenced from the experimental results that the median particle size and standard deviation of zinc metal powder decreased with increasing disc speed. The production yield tended to increase with increasing rotating speed. SEM images revealed that most zinc metal particles were irregular, elongated flakes. The produced zinc power in this study may be suitable for use as a friction material for manufacturing brake pad in the automotive part industry.Index Terms-Centrifugal atomization; design process; particle size distribution; zinc metal powder.

show abstract

Section: A Effect Of Atomizer Disc Speedsupporting

confidence: 89%

Section: B Trajectory Of Dropletmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Design and Development of a Centrifugal Atomizer for Producing Zinc Metal Powder

Sungkhaphaitoon¹,

Plookphol²,

Wisutmethangoon³

2012

IJAPM

View full text Add to dashboard Cite

show abstract

“…There are three different disintegration modes: direct drop formation (DDF), ligament disintegration (LD) and film disintegration (FD). These atomisation modes lead respectively to spheres and spheroids, ligaments, or sheets, as the particle shapes in the powder 5,[9][10][11][12] . The diameter of droplets has been predicted using equation (1) 4 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on Zinc Powder Produced by Centrifugal Atomisation

2017

View full text Add to dashboard Cite

An experimental centrifugal atomiser was used to study the manufacture of zinc powder. Melt temperature, melt flow rate, rotating speed and diameter of the atomising disc, are operating parameters that were varied, and their effects on powder quality and yield were observed. The median particle size and the particle size distribution tended to be better, i.e. smaller and narrower, with increasing rotating speed, melting temperature, and atomising disc size. With decreasing melt flow rate, the median particle size decrease and the particle size distribution is similar, all curves are almost overlapping. The yield of zinc powder increased with rotating speed and disc size, and decreased with melt flow rate. Apparent densities of zinc powder were in the range from 1.65 to 2.51 g/cm 3 . In SEM micrographs most zinc particles were irregular in shape, and the particle structure was mainly cellular based on optical imaging after etching of a polished surface.

show abstract

“…Centrifugal atomisation using a rotating disk, originally developed by the Pratt & Whitney Aircraft Group for the production of rapidly solidified Ni-based superalloy powders [1], is currently used for manufacturing powders and near-net-shape preforms of a variety of metals and alloys, which include Sn, Pb, Zn, Cu, Al, Mg, Ni and Ti-based alloys, superalloys and steels [2][3][4][5]. The process utilises a rapidly rotating disk to break-up a liquid metal stream into a spray of droplets, which either solidify in flight to form spherical particles with a narrow size distribution or are deposited onto a substrate to form microstructurally refined and chemically homogeneous preforms.…”

Section: Introductionmentioning

confidence: 99%

Prediction of powder particle size during centrifugal atomisation using a rotating disk

Li¹,

Deng

2007

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

The centrifugal atomisation of metallic melts using a rotating disk is an important process for powder production and spray deposition. The theoretical prediction of powder particle size is desirable for the design of atomisers. In this paper, wave theory was applied to analyse the disintegration of metallic melts in the film disintegration regime during centrifugal atomisation using a rotating disk. A mathematical model was proposed to predict the spray parameters. The governing equation for the fastest-growing wave number was developed and solved numerically. The effect of the variation in film thickness during film extension was taken into account. Film length and powder particle size were calculated and compared with available experimental data in the literature, and a good agreement was achieved. The influence of the break-up parameter was studied, and it is shown that the break-up parameter is not sensitive to the predicted powder particle size. Both simulated results and experimental data showed that fine powders can be produced by increasing disk speed. r

show abstract

Formation of irregular particles during centrifugal atomization of AZ91 alloy

Cited by 23 publications

References 2 publications

Design and Development of a Centrifugal Atomizer for Producing Zinc Metal Powder

Design and Development of a Centrifugal Atomizer for Producing Zinc Metal Powder

Influence of Process Parameters on Zinc Powder Produced by Centrifugal Atomisation

Prediction of powder particle size during centrifugal atomisation using a rotating disk

Contact Info

Product

Resources

About