Abstract
In order to understand more about the multistage atomisation process, process experiments and orthogonal optimisation of multistage atomisation were carried out for pure tin to make clear the effect of every main process parameter and the optimum conditions. The orthogonal experiments showed that the disk rotating speed and superheat temperature have the largest effects on the mean particle size and that spraying height affects the powder shape coefficient remarkably. The delivery tube position has a pronounced effect on the result and rate of atomisation through changing the pressure characteristics of the nozzle tip and is also an important process factor, while the effect of gas pressure on atomisation result is relatively small. The optimum process conditions for multistage atomisation of pure tin are as follows: superheat 350 K; spraying height 85 mm; gas pressure 0·8 MPa; disk rotating speed 4000 rev min-1; and protrusion height of delivery tube 2–3 mm.
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