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Title: Carbide and carbonitride surface treatment method for refractory metals

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 including a reaction chamber, a source of elemental carbon, a heating subassembly and a source of reaction gases. Alternative methods of providing the elemental carbon and the reaction gases are provided, as well as methods of supporting the metal part, evacuating the chamber with a vacuum subassembly and heating all of the components to the desired temperature. 5 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
415775
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 360101; PA: EDB-97:014567; SN: 97001714631
Patent Number(s):
US 5,580,397/A/
Application Number:
PAN: 8-381,480
Contract Number:
W-7405-ENG-48
Resource Relation:
Other Information: PBD: 3 Dec 1996
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; REFRACTORY METALS; SURFACE TREATMENTS; VACUUM SYSTEMS; CHEMICAL REACTORS; CHEMICAL REACTIONS