Two things everyone knows about diamonds: they’re very hard and they’re very expensive. And so it is with polycrystalline diamond (PCD) as well as cubic boron nitride (CBN) cutting tools.
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Hardness of a mineral
Can your Tool be too Hard or too Tough?
TIL even though diamonds are the hardest material known to man, they can be smashed and shattered by a hammer because hardness only determines how scratch resistant something is, not how strong
Is Diamond Really The Hardest Material Known To Us?