دراسة العوامل المؤثرة في خواص المسحوق المعدني المنتج بطريقة التذرية بالطرد المركزي

الملخص EN

The research includes a study for the variables of the process of centrifugal atomization for the purpose of producing pure tin metal powder and the effect of these variables in the properties of the resulting powder.

These variables are: 1.

The speed of rotation in the rotating part.

2.

The medium of cooling.

3.

The temperature of medium of cooling.

The affect of these above variables were observed on the size and the shape of particles resulting and the particle distribution, the apparent density, tap density and the angle of repose.

Upon the use of three different speeds (2000, 6000, 10000) (rpm) on the each at a time for the rotating of the hollow bowl and the use of water at the room temperature.

It was noticed that when increasing of revolution speed, there is no change in the shapes of particles i.e.

the wide extent of shapes remain irregular, acicular and semispherical, and that the weight percentage of the small particles increases.

Also, the value of the apparent density and the tap density increases while the angle of repose decreases.

It was also observed that at the use of air and water separately at the room temperature as cooling media and disintegration the fused droplets of tin metal out of the hollow bowl at rotation speed of (10000) rpm.

Moreover, we can notice that the weight percentage of the small particles increases as well as the value of the apparent density and tap density, while the value of the repose angle decreases, and the absence of any change in the shape of the particles when using water as a medium of cooling , compare with air .

A great range of irregular, acicular and semispherical shapes are also obtained.

Water of different temperatures ({40-50}, {60-70}, {80-90})◦ C were was used as a cooling medium and for the disintegrating of the droplets of the tin metal from the hollow bowl at rotation speed of (10000) rpm, and the formation of powder of different sizes and shapes.

Also, the tendency of the particles towards regularity of shape and the spherical shape clearly with the decrease of the weight percentage of the small particles, and the value of apparent density and the tap density increase and the value of the angle of repose decreases at the increase of the temperature of water cooling medium.