User talk:Fortran~enwiki

Hey i have aquestion on some other dotcom it said mohs hardness for rhodium was 3.0, is that true because i am doing a project and have to know the answer.please help. thanks! —Preceding unsigned comment added by 75.36.41.154 (talk)

Sorry, been away too long. I suppose you might find some rhodium as soft as 3, one datum I found said 3.5. But is the rhodium pure? What else is present? It isn't unusual for many of the platinum group to occur together. The platinum group can also alloy with iron. What is the grain size? Has the material been worked? Fortran (talk) 01:24, 6 April 2009 (UTC)

The expected range of hardness (Vickers scale) for annealed rhodium is 13.26 to 100. A tabulated minimum hardness range for some kind of anonymous rhodium was given as 100-102, and a tabulated maximum was given as 120-132.6. I would guess these minimum and maximum values would correspond to commercially pure rhodium. A Vickers hardness of 100 is consistent with a Mohs hardness of about 3, whereas a Vickers hardness of 132.6 would be consistent with a Mohs hardness of about 3.5. A vickers hardness of 13.26 is really soft, and probably is around a Mohs hardness of 1 (or less). Commercially, rhodium is alloyed with nickel and platinum (among others). As one might expect to find either nickel or platinum in geological specimens (which is where Mohs hardness numbers are most often used), those are the only alloys I looked up. Both nickel and platinum are effective in getting rhodium to work harden. You might see hardness numbers greater than 200 Vickers (and probably less than 300), it would depend on the alloying and the work process. Johnson Matthey produces precious metals for structural use that have a dispersion of zirconium oxide in them (for example, ZGS Platinum). These materials maintain a more stable grain size in service and have lower creep rates. Fortran (talk) 14:00, 7 April 2009 (UTC)

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