Method and apparatus for producing high purity and unagglomerate

Details Method and apparatus for producing high purity and unagglomerate Method and apparatus for producing high purity and unagglomerate

1994-05-25

1996-03-12

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

427215, 427216, 4272481, 4272551, 427154, 427156, 431 4, 431351, 264 7, B05D 700

Patent

active

054984467

ABSTRACT:
A method and apparatus for reacting sodium vapor with gaseous chlorides in a flame to produce nanoscale particles of un-oxidized metals, composites and ceramics. The flame is operated under conditions which lead to condensation of a NaCl by-product onto the particles. The condensate encapsulates the particles and aids in controlling desired particle size and preventing undesirable agglomeration among the particles during synthesis. Following synthesis, oxidation of the particles is inhibited by the encapsulation and handling character of the products is greatly enhanced. Electron microscopy has revealed that synthesized products are composed of discrete nanoparticles in a NaCl matrix. The NaCl encapsulate has been effectively removed from the particles by both washing and known sublimation technique at 800.degree. C. under low pressure.

REFERENCES:
patent: 4891339 (1990-01-01), Calcote et al.
patent: 4994107 (1991-02-01), Flagan et al.
patent: 5021221 (1991-06-01), Gould et al.
patent: 5128081 (1992-07-01), Siegel et al.
patent: 5230729 (1993-07-01), McCandish et al.
Twenty-Fourth Symposium on Combustion/The Combustion Institute article entitled A New Gas-Phase Combustion Synthesis Process for Pure Metals, Alloys, and Ceramics, 1992/pp. 1869-1876.
AeroChem Research Laboratories, Government Report on Production and Coating of Pure Boron Powders, Mar. 30, 1990.

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