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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 22  1963
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 600C, (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 600C, the optimum sinterinl; temperatures were, 1200-],'W0C for the powders from tannate, 1200-1500C for powders from carbonate and 1300-1400C 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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