Thermite for casting
- Here is a web page where someone used Thermite (the Iron Oxide was salvaged by
running a magnet through sand) to cast an iron chain link. Check out:
There is also a video of the casting on this site.
- --- In firstname.lastname@example.org, "Greg Jahnke" <gjahnke@b...> wrote:
>is a bad
> Unless you have specifically designed your furnace for this, it
> idea. The thermite will melt through the container it is in, burnthrough
> the refractory at the bottom of the furnace, burn through thebottom of your
> container, and continue in to the dirt underneath. Thermite burnsin the
> 5-6k degree range, your refractory is almost certainly not ratedfor this.
> Thermite will burn through a 2000 degree fire brick like it isnothing
>I understand that. I think thermite, like you said, is supposed to
burn around 6500F. From what ive read when its burning it can easily
give you second degree radiation burns. IF i did it I was going to
use an infintesimal amount in a small metal cup over the "emergency"
hole in the bottom of the furnace. Now im thinking if i ever get
around to trying it ill do what someone said and just sprinkle it in
among the charcoal or something in tiny amounts. Sortof a "booster
shot" that activates once the furnace gets hot enough. Probably not
- --- In email@example.com, "gene98329" <gene98329@c...> wrote:
> I've used charcoal for years to melt AL and even a few crucibles
> brass. If all your trying to do is ignite the charcoal fast whynot
> just use a chimney, which is a coffee can opened on one end asturn
> normal and church key openings all around the other end along the
> side. (use the key on the side of the can rather than the bottom)
> This will get the charcoal going and then you can add into your
> furnace with tongs around your crucible. instasll your lid and
> on the blower. This should get a melt within 30-40 minutes at most?crucible
> I always use some thin sections of AL in the bottom of the
> to get the melt started (called a heel) then I add more AL thathas
> been preheating once the initial melt starts.Im really trying to change hte process and use charcoal only as a
> I have since converted to using propane as the newer NA burners
> require no blower and do a great job in half the time!
> Only My $.02
sortof continual, simple heat source .Im trying to find/design a
kerosene burner atm (another low on the totem poll project) and am
thinking of using charcoal in the furnace as a continual heat source
to light the atomised kerosene. Seems safer too. Thanks for the
- --- In firstname.lastname@example.org, "Daniel C. Postellon"
> This is a possible accident. The reason that you need a hightemperature to
> start a thermite reaction is related to the oxide coating.Melting the
> aluminum power releases liquid aluminum, which is very reactive,even though
> the oxide is not. I suspect that the accidents are more likely tooccur if
> you machine aluminum with lots of rusty scrap around, the freshaluminum
> turnings might have some surfaces with little or no oxide coating,and
> therefore more reactive. The thermite reaction basically burnsaluminum,
> using the oxide in iron oxide (rust) as a source of oxygen. Itgenerates
> enough heat to melt the iron which is released by the reaction.There is a
> commercial firm that turns incinerator ash into a relatively inertglass,
> using iron oxide and old aluminum cans as a heat source. Cheapthermite
> should be possible, I just don't know how safe it would be. Letme know if
> it works for you. I wouldn't mind trying it, but I don't want tobe the
> first.Ive thoguht about it for years actually since i saw a movie where
> Dan P.
they used a thermite lance to burn through a bank vault. The idea
that there was something that burned THAT hot set my young (at the
time) mind blazing. Luckily i was wiser when i was younger.
Eventually ill try to make some thermite. Maybe soon. I mostly make
chips though so dont have a lot of fine aluminum or iron about.
Strangely enough i cut a camshaft up to make a lathe spindle on my
cheap pos bandsaww the other day and left LOTS of tiny Fe particle
laying about. I was cutting some 6061 tonight and noticed the steel
had turned to a pile of rust and thought about that safety report. I
wasnt.. really worried.. but it did sit there in the back of my mind
that i could experience a sudden burst of light and heat heh.
BTW others have actually made thermite. Its not common but i found
some web references.
- Sounds awesome. And easy to do. Well except for the "explosion"
--- In email@example.com, "John Norman" <arclight@2...>
> Here is a web page where someone used Thermite (the Iron Oxide was
> running a magnet through sand) to cast an iron chain link. Checkout:
> There is also a video of the casting on this site.
> John N.
- The video is too big of a download for me. Look at his mini arc furnace,
though. I guess this is proof that you can use a graphite mold for
thermite. He does have some impressive safety precautions. Dan P.
> Here is a web page where someone used Thermite (the Iron Oxide was salvaged by
> running a magnet through sand) to cast an iron chain link. Check out:
> There is also a video of the casting on this site.
> John N.
> This list is for discussion of metal casting
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- No reason i can see you couldnt use a graphite mold. This guy is
THROWING money at his projects though heh. Machined graphite molds
for chain links? Heck we bitch about spending an extra buck for a
bag of sand to cast with *grin*
His stuff did give me some neat ideas. I live near the railroad
tracks and you can literally walk up the tracks and pick up spikes
etc all day long they've discarded. Ive heard its superhard so
wouldnt want to machine it but... be kinda nice to machine a
graphite mold for 2" diameter x 24" steel bars etc etc etc :P
Only downside.. did you notice the finish on the castings? ROUGH. I
would have thought a graphite mold and that ultrahigh heat would
have made them smooth as glass.
--- In email@example.com, "Daniel C Postellon"
> The video is too big of a download for me. Look at his mini arcfurnace,
> though. I guess this is proof that you can use a graphite moldfor
> thermite. He does have some impressive safety precautions. DanP.
> >was salvaged by
> > Here is a web page where someone used Thermite (the Iron Oxide
> > running a magnet through sand) to cast an iron chain link.Check out:
> >to share photos and stuff: join Sandcrabs by sending a blank
> > There is also a video of the casting on this site.
> > John N.
> > This list is for discussion of metal casting
> > and does not accept attachments. For off topic discussion and
message to: firstname.lastname@example.org
> > http://groups.yahoo.com/group/sandcrabsbe otherwise solved contact the list owner by email:
> > Please visit our sponsor: Budget Casting Supply
> > http://budgetcastingsupply.com/
> > Files area and list services are at:
> > http://groups.yahoo.com/group/hobbicast For problems that cannot
> > owly@t...
> > Yahoo! Groups Links