THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING
The shrinkage behavior, of compacts from irregular Cu powder, during the initial stages of sintering was determined by a dilatometer method. The effects of compacting pressure and of external load during sintering at a constant heating rate of 3 deg C/min upon shrinkage were observed. The residual stresses present on the surface of compacts heated at the same rate to 200, 300, 400, 500, and 600 deg C were also measured. It was observed that shrinkage starts at temperatures where considerable residual stresses in the surface of the compacts are still present, and that this temperature also depends upon the external stress applied during sintering. Residual and externally applied stresses complement each other in shifting the temperature of beginning shrinkage to lower values with increasing stress. It is concluded that, in the low temperature range up to 400 deg C, residual and externally applied stresses rather than surface tension forces cause shrinkage. (auth)
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, N.Y.
- NSA Number:
- NSA-16-012033
- OSTI ID:
- 4807857
- Report Number(s):
- TID-15137
- Country of Publication:
- United States
- Language:
- English
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