Supporting > Casting

A new way of casting aluminium (to me anyway)

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Admiral_dk:
I had this interesting 16 minute video suggested to me by Youtube - [youtube1]https://www.youtube.com/watch?v=KRW_DniO68M[/youtube1]

I must admit that it is a very nice way of making moulds, a fast turn around and very precise result - but I would really like to know what it is they "paint" the polystyrene moulds with, before pouring sand around them.

No I 'm not going to be casting myself.

fumopuc:
I will try to explain, what I have learned in our foundry.
At every casting process a kind of barrier layer is necessary betwen the sand and the metal.
In this case the foam will be coated to the get the barrier in place.
The hot aluminium burns the foam out and the "paint" still stays between the hot metal and the sand.
The German word is "Schlichte" in Englisch languages I know only the word coating may be a native speaker can help with the right translation.


PS: some more Information just seen


https://www.giessereilexikon.com/en/foundry-lexicon/Encyclopedia/show/facing-coat-3203/

Jasonb:
It is a liquid plaster that coats the foam and gives a better surface finish than if the sand were packed directly around the foam. As it also forms a thin shell the sand does not need to be rammed around the part so hard.

I the home foundry you can dip it into drywall mud a couple of times to get the same effect.

Vixen:
Over in UK it's known simply as ceramic slurry. Does not sound as exciting or descriptive as the German word.

Mike

fumopuc:
Yes, thanks Mike,  ceramic slurry, that was it I could not remember.

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