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| Abstract No.: |
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| Title: |
Mo-alloyed stainless steel coatings by plasma spraying of the shell-core-structured powders with improved cavitation erosion resistance
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| Authors: |
Chang-Jiu Li / Xi'an Jiaotong University, P.R. China
Xian-Jin Liao* / Xi'an Jiaotong University, P.R. China
Ya-Ting Wang/ Xi'an Jiaotong University, China
Xiao-Tao Luo/ Xi'an Jiaotong University, China
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| Abstract: |
Cavitation is one of the main factors leading to the failure of fluid machinery such as water pump, turbine blade and ship propeller. Austenite stainless steel is one of candidate coating materials with excellent cavitation resistance due to its good elasticity, corrosion resistance and low cost. However, the limited inter-splat bonding in the conventional thermal spray coatings usually leads to higher cavitation wear than bulk counterpart. In this study, Mo-clad-SS304 powder particles with core-shell structure prepared by mechanical alloying were used to deposit stainless steel based alloy coating with enhanced lamellar interface bonding by shroulded plasma spraying. The microstructure of the coating was characterized by SEM and XRD. The cavitation behavior of the coating was tested by a vibratory cavitation tester following the ASTM standard G32-03. The particle temperature was measured in comparison with that of conventional SS304 particles during spraying process, and the correlation of particle temperature with coating microstructure was examined. The results show that the Mo-alloyed SS304 coating with enhanced inter-lamellar bonding was deposited, and thus the coating presents high cavitation resistance compared to the conventional 304 stainless steel coating.
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