Thermate -- Could I replace Iron Oxide with Calcium Oxide?

Hi, I'm making a flashbang that's part Thermate using Tetranitrate's Thermite Instructable* and I would like to know if I would be able to replace the iron oxide in the mixture with calcium oxide for a bit of added white. The flashbang is inteaded to be (temporarily) blinding.

Thanks,
BlueGasMask

* www.instructables.com/id/Thermite/


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Prfesser7 years ago
Afraid not.  Thermite requires that the metal in the oxide be significantly less active (have a more negative standard reduction potential) than the pure metal component.  Aluminum is more active than iron, so iron oxide will work, as will many transition metal oxides.  But calcium is *more* active than aluminum, so calcium oxide with aluminum will not work.
+1  Ellingham diagrams are also helpful, when trying to pick a metal to reduce a different metal oxide.

ellingham_Diagrams.jpg
Re-design7 years ago
Is "Thermate" the Australian version of "Thermite"?
lemonie7 years ago
No.
If you're following something that someone else has done, do it that way. On the Pauling scale Calcium is way out for thermite, but if you want white (and cornea-burning-UV) it's magnesium-metal you want. Sodium-chlorate weed-killer will give a good yellow and a spray of salt...

L