Simulation of spherical powder sintering by surface diffusion
Conference
·
OSTI ID:7317287
Neck growth during surface diffusion controlled sintering of monosized spheres is studied by a computer simulation process. Based upon the relationship between the mass transport rate and the morphology parameters of neck size and surface area, kinetic equations are derived for both parameters. The solution shows that a time law similar to that initially proposed by Kuczynski approximately represents neck growth. The neck growth exponent varies with neck size and equals seven at a neck size-to-particle size ratio of 0.3. The reduction in specific surface area is dependent on neck size and powder packing density. The rate of reduction agress with that proposed in the recent literature. The present solution produces less sphere undercutting in the neck region than that reported by Nichols and Mullins. The degree of undercutting is shown to be partially dependent on the numberical approach and influential on the measured neck growth exponent.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 7317287
- Report Number(s):
- SAND-76-8513; CONF-770312-1
- Country of Publication:
- United States
- Language:
- English
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