Metal Casting at Home Part 11. Sodium Silicate & CO2 Core Making.
Making sand cores for a greensand mould using Sodium Silicate and CO2 to harden the sand.
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Fantastic video, you are real inspiration..
@indet1957 Hi- I suppose you know about the very large gingery group on Yahoo groups. I’m a member and my experience is that anybody with a question is always answered by intelligent people who’ve ‘been there’.
@matt12466 I dont know the chemistry but the CO2 does harden the sand. It goes even harder if left for a day or put in the sun.
To support the core there will be core prints in the mould which leave holes in the finished casting. The sand can be removed through these holes. You can’t realy have only a tiny hole because there would be nothing to support the core in the mould. Video 13 shows the sand being removed.
how exactly does the co2 harden the sand?….and how do you suggest removing it out of an enclosed pocket with a tiny opening?
I haven’t had need to try this because they can be dug out easily.
Will these cores dissolve with water too?
Thanks for the help. I believe it may have been too hot as you suggested. When I looked down in the crucible it was glowing red. Of course it was night, but still it was really hot. I’ll try a cooler pour next time.
I usualy melt 2 to 5 kg of metal and use a teaspoon of salt and sodium carbonate whatever the quantity.
Perhaps you have the metal too hot and this is causing the boiling when it hits the steel mould.
You should pour as soon as the metal is completly melted. It shouldn’t be glowing red.
Your videos inspired me when I was deployed to Afghanistan, and upon returning home I built a furnace and poured my first ingots yesterday. I have two questions regarding what you’ve taught us and my experience.
1. What is the best ratio of salt and sodium carbonate to use by weight or volume?
2. My aluminum boiled when I poured it into my new steel 3.5 x 12in “C” channel ingot molds I had just made, and idea why?
I would hate for this to happen in the future if I was trying to cast a part.
I just started in hobby casting hope to be as good as your stuff looks. I am making the Machine shop from scap series of books by David Gingery. I have made several patterns made but my successes look very poor against your work. Thank you for sharing your talent.
thank you it really helped me understand clearly
The reaction is pretty well immediate . I left it in the bag for 5 miniutes though. It contiues to harden more over a few days due to th CO2 in the air.
All your videos are first rate. Thank you very much for spending the time to pass along your knowledge. How long does it take for the CO2 to react with the sodium silicate? I would imagine it’s fairly quickly. Thanks again!
Yes it is a great way to make the cores, been using that method for a while. Also tried making a few small simple moulds using the same method – works OK too.
Dave, you are a wonderful teacher, your videos are so clear and the instructions couldn’t be better. The lack of sound instructions doesn’t hurt either, everything is explained in action – well done.
Tube is PVC electrical conduit split with a slitting saw on my milling machine.
It reacts with the sodium carbonate that was mixed with the sand.
another brilliant video, thanks for posting. How do you split your tubing for making the cores so neatly? Is it just pvc pipe?
how does the co2 harden the core?
Magic
Exactly! and can be used to make a chamber for the CO2. Multiple uses, that’s why I liked how you used it!
Makes mixing easy!
It is only used for making the core and is disposable. Moulding sand will be used for in the
drag and cope.
Excellent!
I very much like the uses of plastic bags throughout the video series!
Can the sand treated with sodium silicate and co2 be reused like the regular casting sand ?