Microstructure and mechanical property of high velocity oxy-fuel sprayed WC-Cr3C2-Ni coatings
Autor: | Zhang Mengxian, Hai-Long Yao, Qing-Yu Chen, Xiao-Bo Bai, Chao Yang, Hong-Tao Wang, Deng-Liang Yi, Gang-Chang Ji |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Decarburization Abrasive 02 engineering and technology Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Indentation hardness Surfaces Coatings and Films 020303 mechanical engineering & transports Fracture toughness 0203 mechanical engineering Indentation Materials Chemistry Composite material 0210 nano-technology Thermal spraying Elastic modulus |
Zdroj: | Surface and Coatings Technology. 397:126010 |
ISSN: | 0257-8972 |
DOI: | 10.1016/j.surfcoat.2020.126010 |
Popis: | WC-Cr3C2-12Ni coatings, with Cr3C2 weight content of 10% and 30%, were fabricated on steel substrate by high velocity oxy-fuel (HVOF) flame spraying technique, and microstructure, phase composition and mechanical properties of WC-Cr3C2-12Ni coatings prepared by different oxygen flows were investigated. The results reveal that phase compositions of WC-Cr3C2-12Ni coatings were mainly influenced by the Cr3C2 content rather than the oxygen flow. WC-Cr3C2-12Ni coatings demonstrated low decarburization and decomposition of WC due to coarse WC gains and high in-flight particle velocities during HVOF. WC-Cr3C2-12Ni coatings exhibited low porosities and typical microstructures, where a mixture of fine and coarse WC grains was uniformly embedded in the Ni/Cr3C2 matrix. The microhardness, indentation fracture toughness and elastic modulus of WC-Cr3C2-12Ni coatings were improved by coarse WC grains, Cr3C2 addition and dense microstructure, which resulted in high wear resistances of WC-Cr3C2-12Ni coatings. The abrasive wear features with groove, peel-off and exposed/fractured WC grains were observed in WC-Cr3C2-12Ni coatings after dry-sliding wear. The relationship between microstructure and mechanical property of WC-Cr3C2-12Ni coatings was discussed from the viewpoints of powder properties and process parameters. |
Databáze: | OpenAIRE |
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