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Carbide and carbonitride surface treatment method for refractory metals

Patent ·
OSTI ID:870710
 [1];  [2]
  1. Danville, CA
  2. Livermore, CA
+ Show Author Affiliations

A carbide and carbonitride surface treatment method for refractory metals is provided, in steps including, heating a part formed of boron, chromium, hafnium, molybdenum, niobium, tantalum, titanium, tungsten or zirconium, or alloys thereof, in an evacuated chamber and then introducing reaction gases including nitrogen and hydrogen, either in elemental or water vapor form, which react with a source of elemental carbon to form carbon-containing gaseous reactants which then react with the metal part to form the desired surface layer. Apparatus for practicing the method is also provided, in the form of a carbide and carbonitride surface treatment system (10) including a reaction chamber (14), a source of elemental carbon (17), a heating subassembly (20) and a source of reaction gases (23). Alternative methods of providing the elemental carbon (17) and the reaction gases (23) are provided, as well as methods of supporting the metal part (12), evacuating the chamber (14) with a vacuum subassembly (18) and heating all of the components to the desired temperature.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Number(s):
US 5580397
OSTI ID:
870710
Country of Publication:
United States
Language:
English

References (1)

The kinetics and mechanisms of the absorption of carbon by niobium and tantalum in a methane or acetylene stream journal March 1974

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Related Subjects

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10
12
14
17
18
20
23
alloys
alternative
alternative method
alternative methods
apparatus
boron
carbide
carbon
carbon-containing
carbonitride
carbonitride surface
chamber
chromium
components
containing gas
containing gaseous
desired
desired surface
desired temperature
elemental
evacuated
evacuated chamber
evacuating
form
form carbon
formed
gaseous
gaseous reactant
gaseous reactants
gases
hafnium
heating
hydrogen
including
introducing
layer
metal
metals
method
methods
molybdenum
niobium
nitrogen
practicing
provided
providing
react
reactants
reaction
reaction chamber
reaction gas
reaction gases
refractory
refractory metal
refractory metals
source
steps
subassembly
supporting
surface
surface layer
surface treatment
tantalum
temperature
titanium
treatment
treatment method
tungsten
vacuum
vapor
vapor form
water
water vapor
zirconium