| SINTERING OF THORIA POWDERS - PART I
A study of the Relation between the Mode of Origin,
Powder Characteristics and Sinterability of
Thoria Powders |
V. K. MOORTHY and A. K. KULKARNI
Pages : 116-129
DOI : 10.1080/0371750X.1963.10855464 |
| Abstract |
| Thoria jJOwders prepared by thermal decomposition of thorium compounds
have different powder characteristics. In the present st,udy of the thoria derived
from thorium tannate, carbonate, oxalate and benzoate by thermal decomj;osition,
it was found that at 600°C, (I) the crystallite size of the usulting j!owdcr bears
a relation to the parent compound; (2) surface characteristics, as indicated by
hydration are different. Increase in temperature of calcination resulted in an increase
in crystallite size and lowering of hydration in the powders of different
orzgzns.
A smaller crystallite size and a greater hydration in the powders resulted
in the densification of the pellets made from them at lower sintering temj;
eratures. It appears that there is an optimum sintering: temperature range
for each of the powders, depending on its characteristics. H'ithin this range,
increase in soaking time resulted in a greater dcnsification. For powders calcined
at 600°C, the optimum sinterinl; temperatures were, 1200-],'·W0°C for the powders
from tannate, 1200-1500°C for powders from carbonate and 1300-1400°C for
powders from the oxalate and benzoate. It is shown that the texture of the compacts
depends on the powders used and the sintering treatments given. An att:empt/
is made to find the relation between the mode of origin, the powder characteristics
and sintering characteristics of thoria. |
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