Method and apparatus for making carbon-encapsulated ultrafine me

Details Method and apparatus for making carbon-encapsulated ultrafine me Method and apparatus for making carbon-encapsulated ultrafine me

1995-01-17

1997-01-14

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Plasma

118716, 118719, 118723ER, 118724, 427216, 427245, 4272551, 427580, 427585, H05H 124

Patent

active

055937403

ABSTRACT:
A method and apparatus for making carbon-encapsulated ultrafine metal particles, in which metal powder intended for encapsulation is injected at a rate up to 25 grams per minutes into a plasma arc so that the metal powder is vaporized. The vaporized metal powder is then mixed with an active gas flow, which consists of hydrocarbons, filled in the surrounding area of the plasma arc, and thereby the vaporized metal powder and the active gas interact continuously producing carbon encapsulated ultrafine metal particles that are remarkably predictable in particle size, distribution of sizes and atomic composition.

REFERENCES:
patent: 3994697 (1976-11-01), Burke
patent: 4274874 (1981-06-01), Obara et al.
patent: 5302450 (1994-04-01), Rao et al.
"Single Crystal Metals Encapsulated in Carbon Nanoparticles", Science, vol. 259, Jan. 15, 1993, pp. 346-348.
"Cobalt-catalysed growth of carbon nanotubes with single-atomic-layer walls", Nature, vol. 363, Jun. 17, 1993.

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