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Gradient graphite/aluminum base surface layer self-lubrication composite and preparing method

A composite material, self-lubricating technology, applied in metal material coating process, coating, liquid chemical plating and other directions, can solve the problems of low overall strength, difficult to distribute graphite on demand, poor mechanical properties, etc., to improve service life , reduce friction running and phase, reduce the effect of friction and wear

Active Publication Date: 2017-01-18
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the traditional self-lubricating aluminum-based composite material preparation process, it is difficult to realize the distribution of graphite required in different stages of friction and wear, and overcome the matching problem of the mechanical properties and friction and wear properties of the self-lubricating composite material
To solve the problems of the existing self-lubricating aluminum-based composite materials with low overall strength, poor mechanical properties and difficulty in realizing the distribution of graphite on demand and gradient distribution, and provide a preparation method of gradient graphite-based aluminum-based surface layer self-lubricating materials

Method used

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  • Gradient graphite/aluminum base surface layer self-lubrication composite and preparing method
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  • Gradient graphite/aluminum base surface layer self-lubrication composite and preparing method

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Embodiment 1

[0032] Such as image 3 Shown, a kind of preparation method of gradient graphite / aluminum matrix surface layer self-lubricating composite material, it comprises the steps:

[0033] (1) Take graphite powder (200 mesh) and phenolic resin powder (600 mesh) as the raw materials for preparing the graphite skeleton, mix them evenly and put them into the selective laser sintering molding machine, in which the phenolic resin powder is the binder, and the phenolic resin Accounting for 25% of the total mass of the powder. Gradient structure graphite framework green body is prepared by selective laser sintering method. Gradient structure graphite framework is divided into three layers as a whole, in which the mass fraction of graphite skeleton in the first layer accounts for 10% of the layer where the aluminum alloy is located, and the thickness is 0.1mm; the mass fraction of the graphite skeleton of the second layer accounts for 8% of the layer where the aluminum alloy is located, and ...

Embodiment 2

[0041] 1) Take graphite powder (300 mesh) and phenolic resin powder (700 mesh) as the raw materials for preparing graphite skeleton, mix them evenly and put them into the selective laser sintering molding machine, in which the phenolic resin powder is the binder, and the phenolic resin accounts for 30% of the total mass of powder. Gradient structure graphite framework green body is prepared by selective laser sintering method. Gradient structure graphite framework is divided into three layers as a whole, in which the mass fraction of graphite skeleton in the first layer accounts for 12% of the layer where the aluminum alloy is located, and the thickness is 0.1mm; 1.8mm; the mass fraction of the graphite skeleton in the third layer accounts for 7% of the layer where the aluminum alloy is located, and the thickness is 0.4mm.

[0042] 2) Put the above-mentioned graphite skeleton in a high-temperature carbonization furnace, and carry out carbonization treatment in a nitrogen or a...

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Abstract

The invention discloses a preparing method of a gradient graphite / aluminum base surface layer self-lubrication composite, and belongs to the field of self-lubrication material preparing. The gradient graphite / aluminum base surface layer self-lubrication composite is formed by combining an aluminum alloy and a graphite framework with a gradient distribution structure. The preparing method comprises the steps that firstly, the graphite framework with the gradient distribution structure is prepared through the selective laser sintering forming technology, the graphite framework is subjected to carbonization treatment, and copper plating treatment is conducted on the surface of the graphite framework; and finally, a casting method is adopted, the graphite framework is fixed to the bottom of a die, the aluminum alloy is heated to be molten, then the aluminum alloy is cast in the die, and after cooling demolding, the gradient graphite / aluminum base surface layer self-lubrication composite is prepared. The method solves the problems that in the traditional self-lubrication aluminum base composite preparing process, needed graphite distribution for different friction abrasion stages is hard to achieve, and the problem about matching of the mechanical performance and friction abrasion performance of the self-lubrication composite is solved.

Description

technical field [0001] The invention belongs to the field of self-lubricating material preparation, and in particular relates to a preparation method of a gradient graphite / aluminum-based surface layer self-lubricating composite material. Background technique [0002] Graphite-reinforced aluminum matrix composites are self-lubricating materials with excellent performance. This composite material not only has the metal characteristics of high aluminum matrix specific strength and good thermal conductivity, but also combines the self-lubricating properties and good chemical stability of graphite. Compared with aluminum-tin, aluminum-lead, and tin-bronze self-lubricating alloys widely used at present, it has excellent self-lubricating properties, high-temperature strength and low density, and better environmental protection properties. Therefore, it can be widely used in the manufacture of structural parts of space shuttles, artificial satellites, rockets and aircrafts, high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/00C23C18/18C23C18/40
CPCB22D19/00C23C18/1886C23C18/405
Inventor 叶喜葱吴彬彬肖克强吴海华
Owner CHINA THREE GORGES UNIV