Characteristic comparison of stacked WC-based coatings prepared by high-velocity oxygen-fuel spray and electric contact strengthening

Homogeneous stacked WC-based coatings were prepared by high-velocity oxygen-fuel spray (HVOF) and electric contact strengthening (ECS). The microstructure, porosity, interfacial adhesion, phase composition and mechanical properties were investigated and evaluated. The thermal shock test was carried...

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Bibliographic Details
Published in:Surface & coatings technology 2021-09, Vol.421, p.127289, Article 127289
Main Authors: Sun, Ze, Zhu, Shigen, Dong, Weiwei, Bai, Yunfeng, Ding, Hao, Luo, Yilan, Di, Ping
Format: Article
Language:English
Subjects:
Bonding strength
Coatings
Electric contact strengthening
Electric contacts
Fuel sprays
Fuels
Heating-pressing action
High velocity oxyfuel spraying
High-velocity oxygen-fuel spray
Interface adhesion
Interfacial bonding
Mechanical properties
Morphology
Phase composition
Porosity
Shock tests
Sprayed coatings
Stacked WC-based coating
Strengthening
Thermal cycling
Thermal shock
Thermal simulation
Tungsten carbide
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Summary:Homogeneous stacked WC-based coatings were prepared by high-velocity oxygen-fuel spray (HVOF) and electric contact strengthening (ECS). The microstructure, porosity, interfacial adhesion, phase composition and mechanical properties were investigated and evaluated. The thermal shock test was carried out to test the service performance under simulated thermal cycling working condition, and the interfacial bonding strength of the coating was indirectly compared. The results showed that the pores concentrated at the skin of ECS prepared coating, while those evenly distributed throughout the whole HVOF sprayed coating. With the layer stacked by ECS process, the existed pores in previous coating area were healed. The porosity of three-layer ECS coatings was 2.45%, which was much lower than that of HVOF coating. The interfacial bonding strength of ECS prepared coating was much better, according to morphology, scratch peaks, failure cycling times and residual interfacial phase in thermal shock test. •Stacked WC-based coatings were prepared by a novel method ECS.•Microstructure and characteristics were compared with HVOF coating.•Stronger interface adhesion of ECS coating enhance the thermal shock performance.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2021.127289