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Graphite complex and preparation method thereof

A composite and graphite technology, which is applied in the field of graphite composite and its preparation, can solve problems such as hindering the application of graphite, high production cost, and poor bonding performance

Inactive Publication Date: 2015-06-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both graphite and metal have poor bonding performance, which makes the production cost of graphite-metal composites high and the performance is poor, which seriously hinders the application of graphite.

Method used

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  • Graphite complex and preparation method thereof
  • Graphite complex and preparation method thereof
  • Graphite complex and preparation method thereof

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preparation example Construction

[0044] In the preparation method of the present invention, the heating reaction is usually carried out at 600-1500°C (preferably 800-1400°C), and the reaction time is usually 1-120 minutes (preferably 30-90 minutes).

[0045] The invention provides a kind of preparation method of graphite composite body, preferably comprises the steps:

[0046] (1) providing a mixture comprising graphite particles, a carbide forming element and a salt;

[0047] Preferably, based on the total weight of the mixture in step (1), the mass fraction of the salt is 30-80wt%, preferably 50-70wt%.

[0048] Preferably, based on the total weight of the mixture in step (1), the mass fraction of carbide-forming elements is 0.1-10wt%; more preferably, 2-5wt%; more preferably, 3-7.5wt%.

[0049] (2) Under vacuum or in an inert atmosphere (such as nitrogen, helium, etc. or their combination), the mixture in step (1) is subjected to heating reaction (such as reaction at 600-1500 ° C or 800-1300 ° C), Thus, t...

Embodiment 1

[0059] Embodiment 1 graphite-boron carbide-boron complex

[0060] Mix the flaky graphite powder, barium chloride and a small amount of boron powder with a particle size of 30-50 mesh to make a mixed powder. Calculated by the total weight of the mixed powder, sodium chloride accounts for 70wt%, and boron powder accounts for 8wt%. The mixed powder Put it into a vacuum carbon tube furnace and evacuate to a vacuum of about 10 -2 Pa, the heating rate is 15°C / min, the temperature is raised to 1300°C, kept for 90min, and then cooled to room temperature with the furnace.

[0061] Take out the high-temperature-treated mixed powder, put it into a beaker filled with deionized water, put the beaker filled with the treated mixed powder and deionized water into a drying oven, set the temperature at 85°C, keep it warm for 30 minutes, take out the beaker and dry it. Pour off the aqueous solution of sodium chloride, re-pour in deionized water and repeat the above operations, wash the mixed po...

Embodiment 2

[0065] Embodiment 2 graphite-silicon carbide-silicon composite

[0066] Mix the flaky graphite powder, calcium chloride and a small amount of silicon powder with a particle size of 30-50 mesh to make a mixed powder. Calculate the total weight of the mixed powder, sodium chloride accounts for 70wt%, and silicon powder accounts for 8wt%. The mixed powder Put it into a vacuum carbon tube furnace and evacuate to a vacuum of about 10 -2 Pa, the heating rate is 15°C / min, the temperature is raised to 1300°C, kept for 90min, and then cooled to room temperature with the furnace.

[0067] Take out the high-temperature-treated mixed powder, put it into a beaker filled with deionized water, put the beaker filled with the treated mixed powder and deionized water into a drying oven, set the temperature at 85°C, keep it warm for 30 minutes, take out the beaker and dry it. Pour off the aqueous solution of sodium chloride, re-pour in deionized water and repeat the above operations, wash the m...

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Abstract

The invention relates to a graphite complex and a preparation method thereof. The complex comprises a graphite particle, a carbide layer and a carbide formation element layer, wherein the carbide layer is combined to the surface of the graphite particle, and the carbide formation element layer is combined to the surface of the carbide layer; the above carbide formation element is selected from B, Si, Cr, W and Mo; and the carbide is selected from boron carbide, silicon carbide, tungsten carbide and chromium carbide. The above complex material has excellent performances and can be widely used.

Description

technical field [0001] The invention belongs to the field of graphite composite materials. Specifically, the present invention relates to graphite composites and methods for their preparation. Background technique [0002] Graphite has the characteristics of self-lubrication, small thermal expansion coefficient, good shock absorption, and excellent thermal conductivity, which makes graphite-metal composite materials very suitable for the manufacture of wear-resistant shock-absorbing parts such as pistons, cylinder liners, bearings, and high thermal conductivity graphite. composite material. However, both graphite and metal have poor bonding performance, which makes the production cost of graphite-metal composites high and the performance is poor, which seriously hinders the application of graphite. For this reason, how to preserve the excellent properties of graphite while expanding the application range of graphite and reducing the production cost of graphite composite ma...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B31/30
Inventor 江南白华朱聪旭戴丹王栋杨科马洪兵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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