Investment casting method and pattern material comprising thermally-collapsible expanded microspheres
US5176188A · kind A · utility
44Cited by
13References
3Claims
0Family size
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Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.