Application of thermal spray and ceramic coatings and reinforced epoxy for cavitation damage repair of hydroelectric turbines and pumps. Final report
The U.S. Army Corps of Engineers is one of the largest single producers of hydroelectric power in the United States. The Corps' ability to generate power can be reduced by cavitation in hydroelectric turbines. Cavitation is the damage that results from high velocity liquid flow and pressure changes. Cavitation can be repaired by traditional methods, such as welding or application of epoxy, or by the newer nonfusion methods, such as thermal spray and the use of reinforced epoxies. This research shows that the performance of reinforced epoxies is sensitive to surface preparation and method of application. Repair by these compounds lasts from 6 months to 1 year, but the downtime for repair is very short. New thermal-sprayed metallized coating systems have been tested in the laboratory and show potential for application in cavitation repair. New ceramic coatings have improved cavitation resistance, but their application is limited by current thermal spray technology, which is improving. Cavitation, Reinforced epoxies, Hydroelectric turbines, Thermal spray, Ceramic coatings.
- Research Organization:
- Army Construction Engineering Research Lab., Champaign, IL (United States)
- OSTI ID:
- 5874262
- Report Number(s):
- AD-A-267624/5/XAB; CERL-TR-FM-93/01
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
13 HYDRO ENERGY
CERAMICS
SPRAY COATING
EPOXIDES
HYDRAULIC TURBINES
CAVITATION
REPAIR
HYDROELECTRIC POWER PLANTS
HYDROELECTRIC POWER
PROTECTIVE COATINGS
COATINGS
DEPOSITION
ELECTRIC POWER
ENERGY SOURCES
EQUIPMENT
MACHINERY
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
POWER
POWER PLANTS
RENEWABLE ENERGY SOURCES
SURFACE COATING
TURBINES
TURBOMACHINERY
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360601 - Other Materials- Preparation & Manufacture
130000 - Hydro Energy