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Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
ever seen Brainaics? A terracota flower pot with a thick sheet of paper in the bottom makes a nice time release for thermite.
Also, check your local welding supplier for thermite and igniter, it's MUCH cheaper than buying it from United Nuclear. Thermite is often used for welding (brazing?) heavy cast iron parts together.
Registered Member #693
Joined: Wed May 09 2007, 06:17AM
Location:
Posts: 1
I thought i might chime in (first post!) I do thermite reactions from time to time in chemlab. I like to pretend i'm doing enthalpy reactions - really i'm just having fun.
The trick: I have found that the ratios of iron oxide to al powder are really quite unimportant, as long as the two are well mixed and powdered. The easiest way to get them going is glycerine/potassium permangenate mixture (spontaneous combustion due to exothermic reaction).
You will most probably have a nice stream of molten iron flowing out of your crucible*.
* Please do not try this inside. Do not try this near your kids/pets/curtains. Actually, don't try it at all. But it _is_ fun.
Note: If the thermite reaction is not starting, add more glycerine/Kmn03, with something LONG. Do NOT put your hand above the crucible, unless you would like it to flow out as well. When it starts, it is very hard to stop. If you have a fume cupboard, try doing it in there. Douse with steam/N2 mix if stop desired. It will reignite as soon as you allow oxygen in again - like a time bomb.
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
I used Iron Oxide from a pottery store and Aluminum powder. I mixed the two 50/50 ratio then added Potassium Permanganate for a starter. Oh this worked REALLY REALLY well!!!
CRAZY!! Another cool Thermite you could try is black Copper Oxide and Aluminum powder 50/50 -- this stuff explodes when struck by a bullet or initiated by a fuse.... it velocity is about 1.2 km/sec --- and rivals some flash powders!! Its expensive stuff to make - but it is sure a fun science project.
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
yes, positive - black Copper Oxide. I've tested this energetic thermite mix out and it is awesome - can be a bit hard to ignite but IF you get the right amount of heat - KAAWOOOMPH ---- you get a pyroclastic cloud of copper crystals and white hot shower of sparks. Its amazing stuff!
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Thermite
