Characterization of thermally sprayed coatings for high-temperature wear-protection applications
Under normal high-temperature gas-cooled reactor (HTGR) operating conditions, faying surfaces of metallic components under high contact pressure are prone to friction, wear, and self-welding damage. Component design calls for coatings for the protection of the mating surfaces. Anticipated operating temperatures up to 850 to 950/sup 0/C (1562 to 1742/sup 0/F) and a 40-y design life require coatings with excellent thermal stability and adequate wear and spallation resistance, and they must be compatible with the HTGR coolant helium environment. Plasma and detonation-gun (D-gun) deposited chromium carbide-base and stabilized zirconia coatings are under consideration for wear protection of reactor components such as the thermal barrier, heat exchangers, control rods, and turbomachinery. Programs are under way to address the structural integrity, helium compatibility, and tribological behavior of relevant sprayed coatings. In this paper, the need for protection of critical metallic components and the criteria for selection of coatings are discussed. The technical background to coating development and the experience with the steam cycle HTGR (HTGR-SC) are commented upon. Coating characterization techniques employed at General Atomic Company (GA) are presented, and the progress of the experimental programs is briefly reviewed. In characterizing the coatings for HTGR applications, it is concluded that a systems approach to establish correlation between coating process parameters and coating microstructural and tribological properties for design consideration is required.
- Research Organization:
- General Atomic Co., San Diego, CA (USA)
- DOE Contract Number:
- AT03-76ET35300
- OSTI ID:
- 5255190
- Report Number(s):
- GA-A-15805; CONF-800439-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210300 -- Power Reactors
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36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
COMPATIBILITY
CONTROL ELEMENTS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
DEPOSITION
ELECTRIC GENERATORS
ELEMENTS
FLUIDS
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HEAT EXCHANGERS
HELIUM
HTGR TYPE REACTORS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTOR COMPONENTS
REACTORS
STABILITY
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TURBOGENERATORS
WEAR RESISTANCE
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES