I just watched this (https://youtu.be/jLX1-tNnvEo?t=897)(14:57) and the guy in the video used vacuum and argon gas to remove any oxygen from the melter but I don’t understand why is the argon used if you are already vacuuming all the air out anyway?
In: Chemistry
A couple of reasons. First it’s virtually impossible to make a perfect vacuum. To have an oxygen free environment it’s far easier to pull a 99% then fill with a pure gas, at which point you have about 0.2% oxygen. Do that a few times and you’ll have an oxygen free environment.
Second he’s dealing with molten metal. Under a vacuum molten metals have a much lower boiling point, as he’s trying to make a very precise alloy having some evaporate at different rates wouldn’t be good.
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