Improvement of mechanical and tribological properties of centrifugally cast functionally graded copper for bearing applications
Autor: | Rakesh Reghunath, N. Radhika, Manu Sam |
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Rok vydání: | 2018 |
Předmět: |
Bearing (mechanical)
Materials science Scanning electron microscope Mechanical Engineering Alloy Composite number chemistry.chemical_element 02 engineering and technology engineering.material Tribology 021001 nanoscience & nanotechnology Copper law.invention 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Centrifugal casting (industrial) law engineering Adhesive wear Composite material 0210 nano-technology |
Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 233:3208-3219 |
ISSN: | 2041-2983 0954-4062 |
Popis: | The functionally graded Cu-11Ni-4Si/10wt%WC composite and its alloy have been synthesized using horizontal centrifugal casting technique to compare the mechanical and tribological improvement and its utility for bearings and bushes. Microstructure analysis and mechanical tests showed 43% improvement in hardness and 160% improvement in tensile strength at inner radial distances compared to the outer composite periphery. Fractural analysis showed ductility for alloy, whereas for composites, brittleness at outer and a combination of both ductility and brittleness were observed at inner. Proportional rise in the wear rate and coefficient of friction was observed with increasing load and sliding distances for both composite and alloy. Composite showed a slight decline in the wear rate and coefficient of friction with an increase in the sliding velocity, while alloy showed a linear rise. Worn surfaces analysis of composite showed the formation of oxide layers, which reduced the coefficient of friction at higher sliding velocity, resulting in lower wear rate. |
Databáze: | OpenAIRE |
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