Abstract
Cu/Ti3SiC2/C/BN/GNPs nanocomposites were prepared by vacuum hot-pressing (HP) sintering and hot isostatic pressing (HIP) sintering methods. Microstructures, mechanical and tribological properties of Cu/Ti3SiC2/C/BN/GNPs nanocomposites were investigated. Microstructures were examined by optical microscopy (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM). Mechanical properties were determined by the relative density, micro-Vickers hardness, as well as tensile strength, compressive strength and shear strength. Tribological behavior of the Cu/Ti3SiC2/C/BN/GNPs composite against the GCr15 steel ring was evaluated using an M-2000 wear tester with high tangential sliding velocity. Results demonstrated that BN and graphene nano-platelets (GNPs) have an impact on the microstructures and mechanical properties of Cu/Ti3SiC2/C/BN/GNPs nanocomposites. Based on microstructures, and mechanical and tribological properties of Cu/Ti3SiC2/C/BN/GNP nanocomposites, strengthening, fracture and wear mechanisms for synergistic enhancement by multi-phase reinforcements were analyzed.
Highlights
Copper matrix self-lubricating composites are widely used in many industrial applications, such as friction materials, bearings, bushes, brake pads/discs, electrical sliding contacts and fusion reactors, due to their excellent anti-friction, wear properties, good thermal, electrical conductivities, superior strength and ease of production [1,2,3,4,5,6]
Cu matrix composite shows improved mechanical properties, a better wear resistance and friction coefficient compared to copper without any reinforcements, which suggests the great potential of multi-phase reinforced Cu matrix composites
The morphology and microstructures of the composite powders and nanocomposites were characterized by optical microscopy (OM, AxioCam MRC5, ZEISS, Wetzlar, Germany), and scanning electron microscope (SEM, JEM100CX, JEOL Ltd., Tokyo, Japan) with an energy dispersive X-ray spectrometer (EDS, JEOL Ltd., Tokyo, Japan)
Summary
Copper matrix self-lubricating composites are widely used in many industrial applications, such as friction materials, bearings, bushes, brake pads/discs, electrical sliding contacts and fusion reactors, due to their excellent anti-friction, wear properties, good thermal, electrical conductivities, superior strength and ease of production [1,2,3,4,5,6]. The results reveal that the presence of graphene in matrix can improve the mechanical properties and decrease both the friction coefficient and the wear rate of composites [12]. Cu matrix composite shows improved mechanical properties, a better wear resistance and friction coefficient compared to copper without any reinforcements, which suggests the great potential of multi-phase reinforced Cu matrix composites. The components of h-BN and graphite are proposed to improve the self-lubricating property of composites, GNPs and Ti3 SiC2 are proposed to improve the mechanical properties and tribological properties of the composites without conductivity gradation. To explore the synergistic effects of multi-phase reinforcements on the nanocomposites, microstructures, and mechanical and tribological properties of the Cu/Ti3 SiC2 /C/BN/GNPs nanocomposites were systematically characterized. Strengthening, fracture and wear mechanisms of the nanocomposites were analyzed
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