Friction and wear behavior of chromium carbide coatings
Chromium carbides, tungsten carbide, and chromium oxide have been tested and evaluated as coatings to protect high-temperature gas-cooled reactor (HTGR) steam generator and other HTGR components from adhesion, galling associated with sliding wear or from fretting. Tests were performed in commercially-pure helium and in helium doped with various gaseous impurities (H/sub 2/, H/sub 2/O, CH/sub 4/, CO) to simulate the primary coolant of an HTGR. Several types of chromium carbide coatings including Cr/sub 3/C/sub 2/, Cr/sub 7/C/sub 3/, and Cr/sub 23/C/sub 6/, were tested for wear resistance and resistance to long-term spalling. Tungsten carbide and chromium oxide coatings were tested in sliding wear tests. Cr/sub 23/C/sub 6/-NiCr coatings showed the best performance (from 400 to 816/sup 0/C) whether they were applied by detonation gun or plasma gun spraying methods. The presence of the Cr/sub 23/C/sub 6/-NiCr coatings did not affect the creep rupture properties of Alloy 800H substrates at temperatures up to 760/sup 0/C. Low-cycle fatigue life of similar specimens at 593/sup 0/C was reduced to 10 to 20% when tested in the 1 to 0.6% strain range.
- Research Organization:
- General Atomics Co., San Diego, CA (USA)
- DOE Contract Number:
- AC03-84SF11962
- OSTI ID:
- 6560918
- Report Number(s):
- GA-A-18815; CONF-870388-7; ON: DE87010085
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tribological coatings for nuclear applications in the United Kingdom
Abrasion and erosion wear resistance of Cr{sub 3}C{sub 2}-NiCr coatings prepared by plasma, detonation and high-velocity oxyfuel spraying
Related Subjects
210300 -- Power Reactors
Nonbreeding
Graphite Moderated
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
BOILERS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
COATINGS
CREEP
ELEMENTS
FATIGUE
FLUIDS
FRICTION
GAS COOLED REACTORS
GASES
GRAPHITE MODERATED REACTORS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HELIUM
HTGR TYPE REACTORS
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NICKEL ALLOYS
NONMETALS
RARE GASES
REACTORS
SPRAYED COATINGS
STEAM GENERATORS
TESTING
TRANSITION ELEMENT COMPOUNDS
VAPOR GENERATORS
WEAR RESISTANCE