Copper base-graphite positive gradient composite and preparation method thereof

A technology of composite materials and graphite, applied in heat exchange equipment, stators, transmission devices, etc., can solve the problems of powder density, particle size gradient change requirements, low density, complex process, etc. Insufficient strength, guaranteed self-lubricating performance, and simple process

Active Publication Date: 2016-06-08
CHINA THREE GORGES UNIV
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  • Abstract
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Problems solved by technology

The co-sedimentation method has high requirements on the gradient change of the powder's own density and particle size, which is difficult to guarantee in industrial production.
[0004] The process of the above two preparation methods is not only complicated, but also difficult to ensure that the solid lubricant such as graphite in the copper matrix has a positive gradient change and uniform distribution on any cross-section, and cannot ensure that the copper matrix forms a three-dimensional network structure, which is not conducive to fully In addition, due to the inconsistent thermal expansion coefficients of copper alloy and graphite, the interfacial bonding ability between the two is weak when sintered at high temperature, and the obtained composite material has high porosity and partial density. Low, poor wear resistance, which greatly limits the development and application of copper-graphite composites

Method used

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  • Copper base-graphite positive gradient composite and preparation method thereof
  • Copper base-graphite positive gradient composite and preparation method thereof
  • Copper base-graphite positive gradient composite and preparation method thereof

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Embodiment 1

[0023] Concrete preparation steps are as follows:

[0024] Step 1: Take graphite powder (200 mesh, purity 99.5%) and phenolic resin powder (600 mesh), mix them evenly and put them into a selective laser sintering molding machine, wherein the phenolic resin powder is used as a binder, and the phenolic resin The powder accounts for 30% of the total mass fraction of the mixed powder. A porous graphite framework body with a positive gradient structure was prepared by selective laser sintering forming technology (such as figure 1 shown). From the surface to the inside, the graphite content decreases linearly, and the graphite distribution is relatively uniform on any cross-section. The graphite content in section 1 is 10% of the copper alloy mass fraction, the graphite content in section 2 is 6.5% of the copper alloy mass fraction, and the graphite content in section 3 is 3% of the copper alloy mass fraction. Section 1, Section 2 and Section 3 are friction and wear surfaces. Th...

Embodiment 2

[0029] Concrete preparation steps are as follows:

[0030] Step 1: Take graphite powder (250 mesh, purity 99.5%) and phenolic resin powder (800 mesh), mix them evenly and put them into a selective laser sintering molding machine, wherein the phenolic resin powder is used as a binder, and the phenolic resin The powder accounts for 50% of the total mass of the mixed powder. A porous graphite framework body with a positive gradient structure was prepared by selective laser sintering forming technology (such as figure 1 shown). From the surface to the inside, the graphite content decreases linearly, and the graphite distribution is relatively uniform on any cross-section. The graphite content in section 1 is 10% of the copper alloy mass fraction, the graphite content in section 2 is 6.5% of the copper alloy mass fraction, and the graphite content in section 3 is 3% of the copper alloy mass fraction. Section 1, Section 2 and Section 3 are friction and wear surfaces. The diamete...

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Abstract

The invention discloses a copper base-graphite positive gradient composite and a preparation method thereof. The copper base-graphite positive gradient composite is prepared by compounding copper alloy and a three-dimensional porous graphite skeleton with the positive gradient structure feature. During preparation, a three-dimensional porous graphite skeleton green body with the positive gradient structure feature is prepared by utilizing a selected laser sintering forming technology firstly, then carbonization treatment is carried out on the three-dimensional porous graphite skeleton green body to obtain the three-dimensional porous graphite skeleton, liquid solder is coated on the three-dimensional porous graphite skeleton through a dipping manner, and finally, copper alloy liquid metal is poured in the three-dimensional porous graphite skeleton by adopting a casting manner to obtain the needed copper base-graphite positive gradient self-lubricating composite. The preparation method ensures the graphite content to be in positive gradient change from the outside to the inside, graphite to be uniformly distributed on the arbitrary frictional wear surface and the copper alloy to form a continuous network structure in a composite system, and thus excellent electric and thermal conductivities and excellent mechanical property of a copper matrix are fully exerted.

Description

technical field [0001] The invention relates to a copper-base-graphite positive gradient composite material and a preparation method thereof, belonging to the technical field of self-lubricating friction material preparation, in particular to the preparation of positive gradient self-lubricating friction composite material. Background technique [0002] Copper-graphite composite material is an excellent self-lubricating friction material, which is widely used in the manufacture of mechanical parts such as pantograph slides, electric brushes and self-lubricating bearings. Copper-graphite positive gradient composites improve their friction and wear properties by controlling the gradient distribution of each component in the composite. When the graphite content presents a positive gradient change in the composite material system (that is, the graphite content decreases linearly from the surface to the inside), under the action of friction load, since the strength of the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C9/00B22D19/00
CPCB22D19/0081C22C1/1015C22C1/1036C22C9/00
Inventor 吴海华柳宁董小阳吴朝叶喜葱
Owner CHINA THREE GORGES UNIV
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