I want to ball mill 60 gm of Al powder in steel jar with 10mm diameter ball size. What will be the quantity of balls to be taken for ball milling?
Hi,
it is challenging to ball mill pure Al at room temperature because you risk to splat the metal on the balls and mill surface. cryo mill is recommended. Then, concerning the ball to powder ratio as well other parameters like milling time and rotation speed it depends on which particle size and grain size (nanostructure) you are interested. Higher the ratio (10:1 should be a starting point) higher will be the energy transferred per unit gram of powder so that you will have higher deformation, nanostructure, etc. many papers and models are published and avvilable on this topic. BR,
you can also look at this useful discussion
https://www.researchgate.net/post/Best_way_to_determine_the_ball-to-powder_ratio_in_ball-milling
in many situations it was 10:1, for effective ball milling conditions you can go up to 20:1. But efficiency of ball milling depends upon many factors like Ball dia, PCA used, Rotational speed, type of charge. For a ductile charge it should be better with 15:1. In my research it was 3mm ball dia., and it gives expected results in less than expected time.
Simone
10:1 ratio as stated above is a good way to start. You can read few of my papers on aluminium PM published in Journal of Nuclear Materials during 1967/68 to get some useful hint on ball milling of aluminum powder.
Dr. K
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