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| Abstract No.: |
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| Title: |
Microstructural features of cold sprayed WC-Co nanocomposite coatings
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| Authors: |
Kyeong Baik / Department of Nanomaterials,
Chungnam National University, Korea
Sun-Sik Kim/ Chungnam National University, Korea
Gap-Ho Lee/ Chungnam National University, Korea
Byeong-Geun Seong/ Research Institute of Industrial Science and Technology, Korea
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| Abstract: |
The detailed microstructure of cold-sprayed WC-Co nanocomposite coating has been characterized by transmission electron microscopy. The coating was built up by depositing many feedstock particles with high kinetic energy which caused intensive plastic deformation and high interfacial pressure and temperature at the inter-particle interface. The microstructure at the interface considerably varied with this severe bonding process. The coating was typically made up of WC phases with the size of 200-500nm, similar to WC size in the feedstock powder, in crystalline Co binder matrix. However, particularly fine nanosized WC and amorphous Co phases were present at the interface. In addition, some transformed or distorted phases were also able to exist at the interface. The inhomogeneous microstructure at the interface was attributed to the intensive deformation and highly increased temperature during the severe bonding process.
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