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Behaviors of Cavitation Damage in Seawater for HVOF Spray Coated Layer with WC-10Co4Cr on Cu Alloy
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 Title & Authors
Behaviors of Cavitation Damage in Seawater for HVOF Spray Coated Layer with WC-10Co4Cr on Cu Alloy
Han, Min-Su; Kim, Min-Sung; Jang, Seok-Ki; Kim, Seong-Jong;
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Due to the good corrosion resistance and machinability, copper alloy is commonly employed for shipbuilding, hydroelectric power and tidal power industries. The Cu alloy, however, has poor durability, and the seawater application at fast flow condition becomes vulnerable to cavitation damage leading to economic loss and risking safety. The HVOF(High Velocity Oxygen Fuel) thermal spray coating with WC-10Co4Cr were therefore introduced as a replacement for chromium or ceramic to minimize the cavitation damage and secure durablility under high-velocity and high-pressure fluid flow. Cavitation test was conducted in seawater at and with an amplitude of on HVOF WC-10Co4Cr coatings produced by thermal spray. The cavitation at and exposed the substrate in 12.5 hours and in 10 hours, respectively. Starting from 5 hours of cavitation, the coating layer continued to show damage by higher than 160% over time when the temperature of seawater was elevated from to . Under cavitation environment, although WC-10Co4Cr has good wear resistance and durability, increase in temperature may accelerate the damage rate of the coating layer mainly due to cavitation damage.
Copper alloy;Seawater;High velocity oxygen fuel(HVOF);Cavitation;WC-10Co4Cr coating;
 Cited by
플라즈마 용사 BSCCO(Bismuth Strontium Calcium Copper Oxide) 초전도 피막의 접합 특성,박정식;조창은;고영봉;박광순;박경채;

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