Investment casting pattern material comprising thermally-collapsible expanded microspheres
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United States of America Patent
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Nov 15, 1994
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app pub date -
Apr 27, 1992
filing date -
Feb 14, 1991
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Abstract
A method and composition for forming investment casting patterns wherein thermally-collapsible microspheres are incorporated into the pattern composition. The patterns can be made either by conventional pattern forming techniques or by solid imaging techniques. After investing the microsphere containing pattern in the ceramic shell, the pattern and shell are heated, causing a collapse of the microspheres and thereby preventing cracking of the shell. The shell is then heated to burn-out the remaining pattern material and fire the shell, thereby creating a mold.
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