Investment casting method and pattern material comprising...

Details Investment casting method and pattern material comprising... Investment casting method and pattern material comprising...

B - Operations, Transporting

22

C

B22C 7/02 (2006.01) B22C 1/22 (2006.01) B22C 9/04 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2061124

IM-0912 Title INVESTMENT CASTING METHOD AND PATTERN MATERIAL COMPRISING THERMALLY-COLLAPSIBLE EXPANDED MICROSPHERES 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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