METHOD FOR THE DENSIFICATION AND SPHEROIDIZATION OF SOLID AND SOLUTION PRECURSOR DROPLETS OF MATERIALS USING MICROWAVE GENERATED PLASMA PROCESSING
First Claim
1. A method of producing spheroidal and dense powder products which comprises:
- a) introducing feed material through a materials feeder into a microwave plasma torch;
b) entraining said feed material using laminar flow towards a microwave generated plasma;
c) processing said feed material by exposing it to a uniform temperature profile within the microwave generated plasma;
d) quenching plasma exhaust of said microwave generated plasma;
e) filtering the exhaust gas of said microwave generated plasma; and
f) extracting powder products from said filtered exhaust gas.
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Abstract
A method for processing feed material to produce dense and spheroidal products is described. The feed material is comprised of powder particles from the spray-drying technique or solution precursor droplets from ceramic or metallic materials. The feed material is processed using plasma generated from a microwave. The microwave plasma torch employed is capable of generating laminar flow during processing which allows for the production of spheroidal particles with a homogenous materials distribution. This results in products having improved thermal properties, improved corrosion and wear resistance and a higher tolerance to interface stresses.
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Citations
11 Claims
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1. A method of producing spheroidal and dense powder products which comprises:
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a) introducing feed material through a materials feeder into a microwave plasma torch; b) entraining said feed material using laminar flow towards a microwave generated plasma; c) processing said feed material by exposing it to a uniform temperature profile within the microwave generated plasma; d) quenching plasma exhaust of said microwave generated plasma; e) filtering the exhaust gas of said microwave generated plasma; and f) extracting powder products from said filtered exhaust gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification