Method and apparatus for making carbon-encapsulated ultrafine metal particles
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United States of America Patent
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Jan 14, 1997
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app pub date -
Jan 17, 1995
filing date -
Jan 17, 1995
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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.
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