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What is the difference between corundum and alumina?

Ποια είναι η difference between corundum and alumina?

Good evening, corundum is a common name for alumina, such as corundum crucibles used for high-temperature sintering in chemical instruments, and alumina balls are also called corundum balls for planetary ball milling of some solid particles. The solid alumina is hard and wear-resistant after sintering.

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