Tony Hansen on fri 15 aug 97
I've been wanting to experiment with casting calcined alumina
powder and finally tried it this week. I have some very fine
powder and could not believe what happened. I got it to 2.7
specific gravity with Darvan and it cast like a dream. 30
seconds in a plaster mold for several mm thickness. Just enough
shrinkage to release from the mold. Paper white. Good dry
strength. My Question: How can an inert white powder exhibit
such marvelous working properties, what holds it together?
A company up here is making bullet proof vests by sandwiching
these alumina plates between kevlar. I image they fire to
cone 20 or so.
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T o n y H a n s e n, I M C thansen@digitalfire.com
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INSIGHT5/Magic of Fire II demos at http://digitalfire.com
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