Discussion
Consider the following statements about milling media.
1. Media of the same composition as the powder limit contamination.
2. Denser media generally give a higher energy input per collision.
3. Media wear has no measurable effect on the batch composition.
Answer: A
The first two are correct. The third is wrong, since wear is measurable and is the reason media are chosen to match the powder wherever the purity requirement is tight. Zirconia media are common where alumina would be too soft.
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