Topic: If diamond is the hardest material, why do diamond-tipped sawblades need to be replaced?

+Anonymous A — 9 years ago #48,357

Is it possible that you actually can scratch a diamond?

+Anonymous B — 9 years ago, 12 minutes later[T] [B] #524,459

The diamonds fall out of the blade.

Yes, we can scratch diamond.

TMYK

+Syntax — 9 years ago, 17 seconds later, 13 minutes after the original post[T] [B] #524,460

Consider this Diamond ring - Metal contact points hold in the Diamond. Common loss of full diamond is because over time one or more of the contact points fail and Diamond falls out.

On any tool with industrial diamonds - they are bonded with a glue. So its the glue fail over time not the Ity bitty Diamond that failed. Overheating - excessive vibration leads to early fail

+Anonymous D — 9 years ago, 37 minutes later, 50 minutes after the original post[T] [B] #524,468

@OP

Wurtzite boron nitride is the hardest known substance. Thanks.

·Anonymous A (OP) — 9 years ago, 12 minutes later, 1 hour after the original post[T] [B] #524,470

@previous (D)
Oh, ok.

·Syntax — 9 years ago, 4 minutes later, 1 hour after the original post[T] [B] #524,471

@524,468 (D)
> Wurtzite boron nitride

Well hell you wood have been correct back some time ago

Hexagonal diamond (called lonsdaelite), an allotrope of diamond, shares a similar structure to w-BN. The same bond-flipping process occurred when hardness indentions were performed, and the all-carbon structure outperformed both diamond and w-BN with a strength of 152 GPa, which is 58 percent higher than regular diamond.

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.055503

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