ques re: casting aluminum in petrobond

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Posted by Andrew Sayegh on March 09, 19100 at 14:43:15:

I am trying to develop both planar and dentrite crystal growth in separate aluminum castings, and I am wondering if anyone has any tips or insights about that. I have "petrobond"...is that the best sand to use? DO I need PURE Aluminum to grow planar crystals? Does anyone know where I can order PLAIN pure aluminum in a small quantity (about 5 lbs.)? My sources say that dendrite crystals grow in aluminum-silicon (between 5-12% silicon) alloys. Do dendrite crystals ALWAYS grow in these aluminum alloys while cooling?? If anyone knows ANYTHING, let me know.


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