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| Abstract No.: |
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| Title: |
Cold spray deposition of a core-shell structured WC-Co coating
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| Authors: |
Chang-Jiu Li* / Xi'an Jiaotong University, P.R. China
Xiao-Tao Luo / State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China
Guan-Jun Yang/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China
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| Abstract: |
WC-Co cermet coatings have been widely used in industries for their excellent wear and corrosion resistance. However, the further strengthening by nanosized WC particles is usually hindered by reduction of material toughness due to the thermal effect during conventional processing. Cold spraying is promising process to deposit high quality cermet since microstructure deterioration inherent to the conventional thermal spray can be minimized or eliminated. Thus, the microstructure design of a cermet coating can be realized through the design of starting powder. In this study, cold spraying is used to develop the WC-Co coatings with a WC-10Co core as reinforcement and micro-thick Co shell as the binder in order to realize the simultaneous strengthening and toughening. The core-shell structured spray powders were prepared by mechanical alloying process and the coating was deposited by cold spray. Post-spray annealing was carried out to further modify the coating microstructure. WC-Co coating microstructure and mechanical properties were investigated and relationship between the microstructure and properties is examined.
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