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Influence of graphite particle size on current-carrying friction and abrasion performance for C/Cu composites.
Class: News Date: 2016/10/22 9:10:43
C/Cu composite material with copper with high conductivity and high thermal conductivity and good ductility, but also has graphite good lubricity, low expansion coefficient and the proportion of small features, so it has good electrical conductivity and thermal conductivity, wear resistance, arc erosion resistance performance and high strength and is widely used in all kinds of welding electrodes, electrical appliances engineering switch contact, generator collector ring, armature, rotor, electric locomotive pantograph etc.. This composite material is evenly distributed in the copper matrix graphite particles, metallic copper into three-dimensional reticular structure, graphite lubricant and anti welding effect. The traditional preparation process is the mixture of copper and graphite powder machinery and prepared by powder metallurgy method. Because of the poor wettability of copper and graphite, graphite / copper interface so that only the mechanical interlocking, low bonding strength, physical and mechanical properties of the materials to meet the application requirements, is the effective way to improve the surface treatment of graphite, namely copper coated graphite, graphite and copper matrix so as to enhance the interface, help to improve the mechanical and Tribological Properties of the composite material. At present, more research preparation and Tribological Properties of C/Cu composites, but the friction and wear mechanism analysis is not thorough and comprehensive, because the graphite particle size directly affects the microstructure of the composite and mechanical performance, and then affect the friction performance, so the research of graphite particle size effect on friction and wear behaviour of materials with important to the application of the material. In view of this, the C/Cu composites with 45 and 150 m were prepared by cold pressing and sintering. The friction and wear properties and mechanism of the composites with different grain size were discussed in this paper.
The high pure natural flake graphite with particle size of 45 and 150 m was used to improve the surface copper plating on the surface to improve the wettability between the copper substrate and graphite. After electroless copper plating, graphite particles were washed with distilled water, and then dried in vacuum drying oven to prevent the oxidation of copper layer. The copper coated graphite powder 45, 150 m respectively with a particle diameter of 75 mu m electrolytic copper powder (99.9% purity) were in accordance with the ratio of graphite 10wt%, fully mixing powder into two groups, pressed into the blank in 380MPa, sintering in hydrogen reduction atmosphere protection of bell-jar furnace in molding process, the sintering temperature is 850 to 860 DEG C, insulation 1h. The final processing of phi 9mm * 25MM pin. The test was carried out on a pin on disc friction and wear tester. The pin sample material is a C/Cu composite material, and the disc sample material is a QCr0.5 copper alloy. AC constant current power supply is used as the test power supply, the current is 50A, the sliding speed is 5, 10, 20, s-1, 30m, load 30N, the test time is 10 ~ 20s.
45 m graphite particles can reduce the arc of C/Cu composites, and can significantly improve the current carrying friction environment, which can reduce the arc of M composites. Small graphite particles can improve the mechanical properties of C/Cu composites and enhance the formation of friction surface lubrication, thus effectively reducing the friction coefficient and wear rate of composites.
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Influence of graphite particle size on current-carrying friction and abrasion performance for C/Cu composites.
C/Cu composite material with copper with high conductivity and high thermal conductivity and good ductility, but also has graphite good lubricity, low expansion coefficient and the proportion of small features, so it has good electrical conductivity and thermal conductivity, wear resistance, arc erosion resistance performance and high strength and is widely used in all kinds of welding electrodes, electrical appliances engineering switch contact, generator collector ring, armature, rotor, electric locomotive pantograph etc.. This composite material is evenly distributed in the copper matrix graphite particles, metallic copper into three-dimensional reticular structure, graphite lubricant and anti welding effect. The traditional preparation process is the mixture of copper and graphite powder machinery and prepared by powder metallurgy method. Because of the poor wettability of copper and graphite, graphite / copper interface so that only the mechanical interlocking, low bonding strength, physical and mechanical properties of the materials to meet the application requirements, is the effective way to improve the surface treatment of graphite, namely copper coated graphite, graphite and copper matrix so as to enhance the interface, help to improve the mechanical and Tribological Properties of the composite material. At present, more research preparation and Tribological Properties of C/Cu composites, but the friction and wear mechanism analysis is not thorough and comprehensive, because the graphite particle size directly affects the microstructure of the composite and mechanical performance, and then affect the friction performance, so the research of graphite particle size effect on friction and wear behaviour of materials with important to the application of the material. In view of this, the C/Cu composites with 45 and 150 m were prepared by cold pressing and sintering. The friction and wear properties and mechanism of the composites with different grain size were discussed in this paper.
The high pure natural flake graphite with particle size of 45 and 150 m was used to improve the surface copper plating on the surface to improve the wettability between the copper substrate and graphite. After electroless copper plating, graphite particles were washed with distilled water, and then dried in vacuum drying oven to prevent the oxidation of copper layer. The copper coated graphite powder 45, 150 m respectively with a particle diameter of 75 mu m electrolytic copper powder (99.9% purity) were in accordance with the ratio of graphite 10wt%, fully mixing powder into two groups, pressed into the blank in 380MPa, sintering in hydrogen reduction atmosphere protection of bell-jar furnace in molding process, the sintering temperature is 850 to 860 DEG C, insulation 1h. The final processing of phi 9mm * 25MM pin. The test was carried out on a pin on disc friction and wear tester. The pin sample material is a C/Cu composite material, and the disc sample material is a QCr0.5 copper alloy. AC constant current power supply is used as the test power supply, the current is 50A, the sliding speed is 5, 10, 20, s-1, 30m, load 30N, the test time is 10 ~ 20s.
45 m graphite particles can reduce the arc of C/Cu composites, and can significantly improve the current carrying friction environment, which can reduce the arc of M composites. Small graphite particles can improve the mechanical properties of C/Cu composites and enhance the formation of friction surface lubrication, thus effectively reducing the friction coefficient and wear rate of composites.

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