Influences of the compositions and mechanical properties of HVOF sprayed bimodal WC-Co coating on its high temperature wear performance |
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| Affiliation: | 1. School of Materials Science & Engineering, Tianjin University, Tianjin 300350, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;3. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China;1. Institute of Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621908, China;2. Department of Mining and Materials Engineering, McGill University, Montreal H3A 2B2, Canada;1. Defence Metallurgical Research Laboratory, Hyderabad, India;2. JNTUH, College of Engineering, Sultanpur, India |
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| Abstract: | In this work, the bimodal WC-Co coatings were sprayed by high-velocity oxygen-fuel (HVOF), and the conventional WC-Co coatings were also fabricated for comparison. The microstructure, mechanical properties and high temperature wear performance were investigated. The bimodal WC-Co coating presented denser structure (porosity lower than 1.0%), higher average hardness (1164 HV0.1) and fracture toughness (11.5 ± 1.4 MPa·m1/2) than that of conventional coating. The Weibull analysis of microhardness data of the bimodal coating presents a mono-modal distribution. The friction coefficient and wear rate of the bimodal coating were 0.61 and 2.96 × 10? 6 mm3·N? 1·m? 1, respectively, which is lower than that of conventional coating at the test temperature of 450 °C. The tribofilm could be formed on the worn surface of bimodal WC-Co coating, which is composed of WO3 and CoWO4. The formation of tribofilm could reduce friction and wear. |
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