Proceedings of the Workshop on Heavy Ion Reactions
Chromium carbide-nichrome coatings being considered for wear protection of some critical components in high-temperature gas-cooled reactors (HTGR's) were investigated. The coatings were deposited either by the detonation gun or the plasma-arc process. Sliding wear tests were conducted on specimens in a button-on-plate arrangement with sliding velocities of 7.1 x 10/sup -3/ and 7.9 mm/s at 816/sup 0/C in a helium environment simulates HTGR primary coolant chemistry. The coatings containing 75 or 80 wt % chromium carbide exhibited excellent wear resistance. As the chromium carbide content decreased from either 80 or 75 to 55 wt %, with a concurrent decrease in coating hardness, wear-resistance deteriorated. The friction and wear behavior of the soft coating was similar to that of the bare metal--showing severe galling and significant amounts of wear debris. The friction characteristics of the hard coating exhibited a strong velocity dependence with high friction coefficients in low sliding velocity tests ad vice versa. Both the soft coating and bare metal showed no dependence on sliding velocity. The wear behavior observed in this study is of adhesive type, and the wear damage is believed to be controlled primarily by the delamination process.
- Research Organization:
- General Atomic Co., San Diego, CA (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- EY-76-C-03-0167-065
- OSTI ID:
- 6430020
- Report Number(s):
- GA-A-15133; CONF-790414-1; TRN: 79-009183
- Resource Relation:
- Conference: International conference on wear of materials, Dearborn, MI, USA, 16 Apr 1979
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
CHROMIUM ALLOYS
FRICTION
WEAR RESISTANCE
CHROMIUM CARBIDES
HTGR TYPE REACTORS
NICKEL ALLOYS
COATINGS
ENVIRONMENT
HARD FACING
HARDNESS
HELIUM
REACTOR COMPONENTS
THERMAL EXPANSION
ALLOYS
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CRYOGENIC FLUIDS
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GRAPHITE MODERATED REACTORS
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NONMETALS
RARE GASES
REACTORS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
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Nonbreeding
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