Method of manufacture of nanostructured feeds

Coating processes – Spray coating utilizing flame or plasma heat – Inorganic carbon containing coating – not as steel

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427455, 427456, 427600, 427212, 427421, 427422, 427453, 427447, C23C 404

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active

060250348

ABSTRACT:
This invention relates to methods whereby reprocessed nanoparticle powder feeds, nanoparticle liquid suspensions, and metalorganic liquids are used in conventional thermal spray deposition for the fabrication of high-quality nanostructured coatings. In one embodiment of this invention, the nanostructured feeds consist of spherical agglomerates produced by reprocessing as-synthesized nanostructured powders. The method is applicable to as-synthesized nanostructured powders made by a variety of liquid chemical processing methods. In another embodiment of this invention, a fine dispersion of nanoparticles is directly injected into a combustion flame or plasma thermal spray device to form high-quality nanostructured coatings. In still another embodiment of this invention, liquid metalorganic chemical precursors are directly injected into the combustion flame of a plasma thermal spray device, whereby nanoparticle synthesis, nanoparticle melting, and nanoparticle quenching onto a substrate are performed in a single operation. In these various methods ultrasound is used for disintegration of the as-synthesized particle agglomerates, nanoparticle dispersion in liquid media, and liquid precursor atomization.

REFERENCES:
patent: 3617358 (1971-11-01), Dittrich
patent: 4746468 (1988-05-01), Ozaki et al.

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