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whats d temperature needed to melt soda cans? how good r they for investment casting? Answered

simple. i want to  melt these cola cans (and beer cans too ! ) so i can use it to cast some stuff. interested mainly in investment casting (lost wax method). need to know the temperature. precautions and possible cases of going wrong.
i have an  electronic muffle furnace. if it helps..

regards,
 Chakra

Tags:casting

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jtobako

Best Answer 8 years ago

Melting point in technical works is the slushy, grainy point-casting takes place at about 100 degrees f higher IF all you are doing is simple, thick pieces.  Thin pieces take a higher temp because you loose heat as the metal flows threw the mold.

Cans aren't the best aluminum for casting-try to find aluminum castings and melt them for a better casting alloy.

Investment casting has different problems at different sizes-a small, thin item is going to need more pressure (longer sprew or something to push the metal into the details) and more heat than a big, fat design. 

Aluminum gets a 'skin' of oxide very easily.

Are you pouring or just letting the metal sit on top of the mold in the furnace as it heats?  www.tienchiu.com/travels/ghana/kurofofrom-lost-wax-casting/ has an example of combining the crucible and mold in one unit.

What are you using for a mold?  Plain plaster of paris doesn't hold up to well at molten metal heat.

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jimbobbillysue

8 years ago

Hi Chakra.Re popcans. you can but don't. the problem is twofold. pop cans are pure Al, and that is a proper bugger to cast right. (gas absorption). #2 is all pop/beer cans go into a dryer (commercialy) to get rid of moisture.they are held at a high temp for a long time before melting.  i've had one moisture explosion so far (20 yrs exp.) so don't go there. I go to the junk yard and pay 60cents per lb for scrap. Likewise. anything that is an extrusion (window/door frames) are nasty due to high Si content, They make a mushy casting. Any pix of your furnace? Good luck, J B B S

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chakrajimbobbillysue

Answer 8 years ago

i have a decent muffle furnace capable of 1100C. lined with fire bricks, and a insulated door with a asbestos gasket. not much air will pass so dont have to worry of oxidation. only when taking out the melt chances of open air burning is there...

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steveastrouk

8 years ago

Aluminium melts at 630 C -ish depending on the alloy. It dissolves most metals, so make sure you have a decent crucible

Steve

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lemoniesteveastrouk

Answer 8 years ago

I've not had a problem with steel, what does molten-Al rot?
Mind, the steel would have an oxide-layer of sorts.

L

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steveastrouklemonie

Answer 8 years ago

What we do is done in oxygen free conditions, the corrosion is horrible. What we have done though is used a high Cr stainless and baked it ~800C in air. The oxide layer seems to work well.

Steve

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lemoniesteveastrouk

Answer 8 years ago

Beer-cans, bean-can, open-fire works - but that's not nice clean aluminium (or steel). The steel cans burn through in the end but you get long enough out of them.

L

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hadehnicholes

8 years ago

1120 degrees ferinhight will be what you need