Emulsion-char method for making fine ceramic powders

Details Emulsion-char method for making fine ceramic powders Emulsion-char method for making fine ceramic powders

1986-12-29

1988-06-07

Capella, Steven

Compositions: ceramic

Ceramic compositions

423592, 423593, 423598, 423608, 423636, C04B 3500, C01B 1314

Patent

active

047496649

ABSTRACT:
Water soluble precursors of ceramic compounds are emulsified in an organic fluid containing an organic surfactant. The emulsion is subsequently mildly heated at a pressure of about 0.05 atmospheres to remove the free water from the emulsion droplets. The resulting sludge consists of particles deriving from the dehydrated emulsion droplets. These particles may only be bound by the surfactant, all or most of the original organic fluid having been boiling off under low pressure. This sludge is then heated in a standard air atmosphere to char the surfactant, which char is to maintain the separation between the dried droplet-derived particles to prevent forming sintered or fused agglomerates thereof. With continued heating the transient char is subsequently burned off and the particles are calcined to controllably and simply produce a fine ceramic powder of spherical particles having a narrow size distribution and an average size in the particularly useful range of 0.1 micron to 1.0 micron.

REFERENCES:
patent: 3330697 (1967-07-01), Pechini
patent: 3647364 (1972-03-01), Mazdiyasni et al.
patent: 4081857 (1978-03-01), Hanold, III
patent: 4654075 (1987-03-01), Cipollini
D. Hennings & W. Mayr, "Thermal Decomposition of (BaTi) into _Barium Titanate", Journal of Solid State Chemistry, 26, pp. 329-338, (1978).

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