A kind of copper base-graphite self-lubricating composite material and preparation method thereof

Abstract

The invention discloses a copper-based graphite self-lubricating composite material and a preparing method thereof. The copper-based graphite self-lubricating composite material is prepared from copper alloy and a three-dimensional graphite framework, wherein the copper alloy comprises the ingredients of Cu, MoS2 and SiC. In the preparing process, a three-dimensional graphite framework blank is prepared through a selectivity laser sintering molding technology, and thus the three-dimensional graphite framework is obtained after graphitization is carried out; after the surface is plated with copper, the three-dimensional graphite framework is assembled into a sand mold cast cavity; and finally, the copper alloy and the three-dimensional graphite framework are combined through a casting manner, and the needed copper-based graphite self-lubricating composite material is obtained. By means of the method, the distribution range of graphite is controllable, the consecutiveness of a copper alloy matrix is ensured, and thus the copper-based graphite self-lubricating composite material has the good electric conductivity, heat conductivity, impact resistance and self-lubricating performance. The copper-based graphite self-lubricating composite material is used for preparing electric brushes, electrodes, pantograph pans, self-lubricating bearings and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to a copper-based-graphite self-lubricating composite material and a preparation method thereof, belonging to the field of friction materials, in particular to the field of manufacturing methods of friction materials. Background technique [0002] When the traditional powder metallurgy method is used to prepare copper-graphite self-lubricating composite materials, it needs to go through many processes such as powder making, powder mixing, pressing and high-temperature sintering. The prepared copper-graphite self-lubricating composite material, because the conductivity of graphite is far inferior to that of copper, to ensure the conductivity of the material, it is necessary to reduce the amount of graphite, resulting in a decrease in the self-lubricating effect, or in order to ensure the self-lubricating performance, the material’s The conductivity and strength are reduced. At the same time, due to the discrete distribution of grap...

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Problems solved by technology

[0003] When adopting traditional methods to prepare copper-graphite self-lubricating composite materials, the distribution range of graphite is uncontrollable, and it is difficult to ensure that the copper alloy forms a continuous conductive network structure, which is not conducive to giving full play to the excellent electrical conductivity of copper and the self-lubricating properties of graphite, and Due to the existence of pores, copper-graphite composites have low density, poor impact resistance, and unstable self-lubricating properties.

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