3531Views5Replies

Author Options:

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

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/

5 Replies

user
PrfesserBest Answer (author)2010-05-24

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.

Select as Best AnswerUndo Best Answer

user
Jack A Lopez (author)Prfesser2010-05-24

+1  Ellingham diagrams are also helpful, when trying to pick a metal to reduce a different metal oxide.

Select as Best AnswerUndo Best Answer

user
Re-design (author)2010-05-24

Is "Thermate" the Australian version of "Thermite"?

Select as Best AnswerUndo Best Answer

user
lemonie (author)2010-05-24

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

Select as Best AnswerUndo Best Answer