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the small quantities we are melting at a time, there is very little time between melt and pour. I have degassed the metal before in an attempt to solve the porosity issue, but it did not help. The porosity issue we were having was a result of pouring at much higher temperatures. Higher temperatures created a much larger variation in solidification rates between the top and bottom of the part. The section that cools first contracts more and draws liquid from its surroundings which results in a sort of "tearing" of the material internally and causes porosity issues. It is a mechanical effect of permanent mold casting rather than effects of the chemistry. It took a good bit of time to make this whole process work - on the order of about 3 months to fully refine the equipment and process, ~100 hours. Theres a ton more information about what it took to make what you see in the video possible and have better than 90% yield.... far too much to carry on here about... but definately was a learning process.
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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