Carbide and carbonitride surface treatment method for refractory metals
- Danville, CA
- Livermore, CA
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 (United States)
- 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
The kinetics and mechanisms of the absorption of carbon by niobium and tantalum in a methane or acetylene stream
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journal | March 1974 |
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Related Subjects
carbonitride
surface
treatment
method
refractory
metals
provided
steps
including
heating
formed
boron
chromium
hafnium
molybdenum
niobium
tantalum
titanium
tungsten
zirconium
alloys
evacuated
chamber
introducing
reaction
gases
nitrogen
hydrogen
elemental
water
vapor
form
react
source
carbon
carbon-containing
gaseous
reactants
metal
desired
layer
apparatus
practicing
10
14
17
subassembly
20
23
alternative
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providing
supporting
12
evacuating
vacuum
18
components
temperature
treatment method
reaction gases
reaction gas
gaseous reactants
gaseous reactant
refractory metal
water vapor
reaction chamber
surface layer
containing gas
form carbon
evacuated chamber
surface treatment
desired temperature
carbonitride surface
alternative methods
alternative method
refractory metals
desired surface
vapor form
containing gaseous
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