Aerosol reactor production of uniform submicron powders

Details Aerosol reactor production of uniform submicron powders Aerosol reactor production of uniform submicron powders

1988-09-08

1991-02-19

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

423341, 423350, 423409, 423439, 427213, 427214, 427215, C01B 3302, C22C 104, B05D 700

Patent

active

049941070

ABSTRACT:
A method of producing submicron nonagglomerated particles in a single stage reactor includes introducing a reactant or mixture of reactants at one end while varying the temperature along the reactor to initiate reactions at a low rate. As homogeneously small numbers of seed particles generated in the initial section of the reactor progress through the reactor, the reaction is gradually accelerated through programmed increases in temperature along the length of the reactor to promote particle growth by chemical vapor deposition while minimizing agglomerate formation by maintaining a sufficiently low number concentration of particles in the reactor such that coagulation is inhibited within the residence time of particles in the reactor. The maximum temperature and minimum residence time is defined by a combination of temperature and residence time that is necessary to bring the reaction to completion. In one embodiment, electronic grade silane and high purity nitrogen are introduced into the reactor and temperatures of approximately 770.degree. K. to 1550.degree. K. are employed. In another embodiment silane and ammonia are employed at temperatures from 750.degree. K. to 1800.degree. K.

REFERENCES:
patent: 3800740 (1974-04-01), Robinson
patent: 4084024 (1978-04-01), Schumacher
patent: 4207360 (1980-06-01), Padovani
patent: 4642227 (1987-02-01), Flagan et al.

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