Finding Hardness values

[engineer23]

Is there a website or book that lists hardness values for the following:

Polycrystalline Boron Nitride
Molybdenum
Tungsten Carbide
Diamond
h13
B4C
SiC
Al2O3

I've tried www.matweb.com, but they only have hardness values for some of these materials. I can't locate PCBN in their database either.

Thanks for any help!

[Mapes]

You could try the Handbook of Refractory Carbides and Nitrides. They quote a Vickers hardness of 0.08-0.09 GPa for "hot-pressed boron nitride."