Method for the generation of variable density metal vapors which bypasses the liquidus phase

Patent · Mon Jan 01 00:00:00 EST 2001

OSTI ID:873519

Kunnmann, Walter ^[1]; Larese, John Z ^[2]

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1. Stony Brook, NY
2. Rocky Point, NY

The present invention provides a method for producing a metal vapor that includes the steps of combining a metal and graphite in a vessel to form a mixture; heating the mixture to a first temperature in an argon gas atmosphere to form a metal carbide; maintaining the first temperature for a period of time; heating the metal carbide to a second temperature to form a metal vapor; withdrawing the metal vapor and the argon gas from the vessel; and separating the metal vapor from the argon gas. Metal vapors made using this method can be used to produce uniform powders of the metal oxide that have narrow size distribution and high purity.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• DOE Contract Number: AC02-98CH10886
• Assignee: Brookhaven Science Associates (Upton, NY)
• Patent Number(s): US 6179897
• OSTI ID: 873519
• Country of Publication: United States
• Language: English

Related Subjects

method
generation
variable
density
metal
vapors
bypasses
liquidus
phase
provides
producing
vapor
steps
combining
graphite
vessel
form
mixture
heating
temperature
argon
gas
atmosphere
carbide
maintaining
period
time
withdrawing
separating
produce
uniform
powders
oxide
narrow
size
distribution
purity
narrow size
metal carbide
size distribution
metal vapor
metal oxide
gas atmosphere
variable density
uniform powder
density metal
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