Method for the densification and spheroidization of solid and solution precursor droplets of materials using microwave generated plasma processing
First Claim
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1. A method of producing spheroidal and dense powder products which comprises:
- introducing feed material through a materials feeder into a microwave plasma torch, wherein the feed material includes ceramic or metallic materials;
entraining said feed material using an axis-symmetric laminar entrainment flow towards a microwave generated plasma;
guiding said feed material towards the microwave generated plasma using an axis-symmetric laminar cooling flow;
processing said feed material within the microwave generated plasma;
quenching a plasma exhaust gas of said microwave generated plasma; and
extracting powder products from the quenched plasma 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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introducing feed material through a materials feeder into a microwave plasma torch, wherein the feed material includes ceramic or metallic materials; entraining said feed material using an axis-symmetric laminar entrainment flow towards a microwave generated plasma; guiding said feed material towards the microwave generated plasma using an axis-symmetric laminar cooling flow; processing said feed material within the microwave generated plasma; quenching a plasma exhaust gas of said microwave generated plasma; and extracting powder products from the quenched plasma exhaust gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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