| Kinetics of Sintering of Uranium Dioxide |
N. C. SONI AND V. K. MOORTHY
Pages : 143-148
DOI : 10.1080/0371750X.1978.10840691 |
| Abstract |
| The kinetics of sintering of U02 powders derived from
ADU route and calcined at different temperatures was
studied. The activation energy for sintering was found to
depend on the calcination temperature, the density chosen
and the sintering temperature range.
The motive force for sintering is the excess free energy
in the particle system. This exists in the powder compact
in the form of surface energy and the excess lattice energy
due to defects. The defects which can be eliminated at the
operating temperature are responsible for the mobility and
hence sintering. This concept of the motive force for sintering
has been used to explain the difference in the activation
energies observed in the present study. This would also
explain phenomena such as attainment of limiting density,
presence of optimum sintering temperature and the influence
of calcination treatments on the sintering behaviour
of powders. |
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