THE INFLUENCE OF GRAVITY UPON THE SHRINKAGE OF COPPER POWDER COMPACTS
The possibility that gravity forces might play a role in the shrinkage behavior of compacts was investigated. Compacts were fabricated from irregularly shaped, electrolytic copper powder. The compacts were sintered at a temperature of 925 deg C generally for 1 hr. The samples were supported in various ways during sintering. The average radial shrinkage of the samples was of the order of 6%, the average axial shrinkage of the order of 5% for compacts pressed both from the plus or minus 325 and the -325 mesh fractions of powder. In all cases, the part of the compact which had the highest axial compressive force due to gravity during sintering exhibited less radial shrinkage than the part of the compact which had lower axial forces. The samples for which the top and bettom axial shrinkages were measured showed greater axial shrinkage in the bottom half which had the highest axial compressive force due to gravity during sintering. (M.C.G.)
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, N.Y.
- NSA Number:
- NSA-16-013516
- OSTI ID:
- 4802718
- Report Number(s):
- TID-15138
- Country of Publication:
- United States
- Language:
- English
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