What is centrifugal atomization?
In centrifugal atomization, centrifugal force breaks up the liquid and throws off the molten metal as a spray of droplets that then solidify as powder particles. Centrifugal atomization also generally leads to a much narrower spread in particle sizes than does gas atomization (see Fig.
What are different stages of atomization process?
After being nebulized by gaseous oxidant and mixed with fuel, the sample is carried into a flame where the heat allows atomization to occur. Once the sample reaches the flame, three more steps occur, desolvation, volatilization, and dissociation.
What is an example of atomization?
For example, during the gas-atomization process, molten steel is atomized into fine metal droplets, which cool down during their fall in the atomizing tower. Metal powders obtained by gas atomization offer a perfectly spherical shape combined with a high cleanliness level.
How does a rotary atomizer work?
Rotary atomizers use a high speed rotating disk, cup or wheel to discharge liquid at high speed to the perimeter, forming a hollow cone spray. The rotational speed controls the drop size. These devices achieve this atomization by releasing the liquid at very high speed into the unagitated air.
What is atomization used for?
Atomization refers to breaking bonds in some substance to obtain its constituent atoms in gas phase. By extension, it also means separating something into fine particles, for example: process of breaking bulk liquids into small droplets.
What are the three stages of atomization?
A three stage atomizer has been constructed consisting of airblast, swirl and effervescent stages allowing for more than one mode to contribute to the primary and secondary atomization of a single liquid jet.
Which is the mode of centrifugal atomization?
The mode of centrifugal atomization is the rapid solidification rate (RSR) process. The RSR process has been described by Cox et al [37], Paterson [38], and Anderson [39]. The first RSR unit operated in late 1977, producing IN-100 powder in a pilot plant and patents were issued in 1978 [21] and 1982 [40].
How does centrifugal atomization break up molten metal?
In centrifugal atomization, centrifugal force breaks up the liquid and throws off the molten metal as a spray of droplets that then solidify as powder particles. As shown in Fig. 1, there are several different types, which are discussed.
How is a nozzle used in rotary atomization?
In centrifugal or rotary atomization, a nozzle introduces fluid at the center of a spinning cup or disk. Centrifugal force carries the fluid to the edge of the disk and throws the fluid off the edge. The liquid forms ligaments or sheets that break into fine droplets.
What is the RRG of centrifugal atomization?
Centrifugal atomization also generally leads to a much narrower spread in particle sizes than does gas atomization (see Fig. 2), with rrg as low as 1.2 to 1.4 in some cases.