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Preparation method for graphene modified carbon/carbon electrical contact

A technology of graphene modification and electric contacts, which is applied in the directions of contacts, circuits, electric switches, etc., to achieve the effects of improved mechanical properties, good wear resistance, and uniform distribution

Active Publication Date: 2018-09-04
内蒙古栢特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding graphene as a skeleton in copper alloy makes the material have high hardness, but there is room for further improvement in the performance of electrical contact materials

Method used

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  • Preparation method for graphene modified carbon/carbon electrical contact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Use pre-oxygenated silk felt needled body as the prefabricated body material, and the density of the prefabricated body is controlled at 0.12g / cm 3 , the needle density of the pre-oxygenated silk felt needle-punched body is 15 needles / cm 2 .

[0028] Step 2: Carbonize the prefabricated body used in Step 1. The carbonization temperature is 500°C, the heating rate is 2°C / h, and the holding time is 1h.

[0029] Step 3: Densify the preform treated in step 2 by chemical vapor deposition, using methane and propane mixed gas as the carbon source gas, the mixed volume ratio of methane and propane is 1:1, and the gas flow rate is 0.5m 3 / h, the heating rate is 5°C / h, the deposition temperature is 900°C, and the deposition time is 200h. When the density ≥ 1.00g / cm 3 Then transfer to the next dense process.

[0030] Step 4: Mix and dilute the graphene with an organic solvent and resin, pressurize and immerse the porous carbon / carbon composite body after chemical vapor ...

Embodiment 2

[0037] Step 1: Use pre-oxygenated silk felt needled body as the prefabricated body material, and the density of the prefabricated body is controlled at 0.18g / cm 3 , the needle density of the pre-oxygenated silk felt needle-punched body is 40 needles / cm 2 .

[0038] Step 2: Carbonize the prefabricated body used in Step 1. The carbonization temperature is 650°C, the heating rate is 10°C / h, and the holding time is 2h.

[0039] Step 3: Densify the preform processed in step 2 by chemical vapor deposition, using methane and propane mixed gas as the carbon source gas, the mixed volume ratio of methane and propane is 1:1, and the gas flow rate is 2.5m 3 / h, the heating rate is 50°C / h, the deposition temperature is 900°C, and the deposition time is 150h. When the density ≥ 1.00g / cm 3 Then transfer to the next dense process.

[0040] Step 4: Dilute the graphene by mixing the organic solvent and the resin, pressurize and immerse in the porous carbon / carbon composite body after chemica...

Embodiment 3

[0047] Step 1: Use pre-oxygenated silk felt as the preform material, and the density of the preform is controlled at 0.25g / cm 3 , the needle density of the pre-oxygenated silk felt needle-punched body is 60 needles / cm 2 .

[0048] Step 2: Carbonize the prefabricated body used in Step 1. The carbonization temperature is 700°C, the heating rate is 20°C / h, and the holding time is 8h.

[0049] Step 3: Densify the preform treated in step 2 by chemical vapor deposition, using methane and propane mixed gas as the carbon source gas, the mixed volume ratio of methane and propane is 1:1, and the gas flow rate is 4.0m 3 / h, the heating rate is 100°C / h, the deposition temperature is 1100°C, and the deposition time is 50h. When the density ≥ 1.00g / cm 3 Then transfer to the next dense process.

[0050] Step 4: After mixing and diluting the graphene with an organic solvent and a resin, pressurize and immerse in a porous carbon / carbon composite body after chemical vapor deposition treatme...

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Abstract

The invention relates to an electrical contact material and a preparation method thereof, and a graphene modified carbon / carbon electrical contact and a preparation method thereof. According to the invention, by utilization of the characteristics of high strength, high electrical conductivity and high thermal conductivity of graphene, the graphene is adopted for functional modification of a carbon / carbon composite material; the graphene and resin are mixed and diluted through an organic solvent, and pressurized to be immersed into a porous chemical-vapor-deposition treated carbon / carbon composite green body; and the processes of curing, carbonization and graphitization are adopted to prepare a graphene-modified carbon / carbon composite electrical contact which has the advantages of excellent mechanical properties, high mechanical strength, low electrical resistivity, good wear resistance, good arc-erosion resistance, etc.

Description

technical field [0001] The invention relates to an electric contact material and a preparation method thereof, in particular to a graphene modified carbon / carbon electric contact and a preparation method thereof. Background technique [0002] The vacuum contact material is an important factor affecting the breaking performance of the vacuum switch. The contact material is required to have high electrical conductivity, high thermal conductivity, high mechanical strength and low contact resistance. The vacuum switch does not need to be overhauled, and the contacts need to withstand at least 8-12 times, and the rated short-circuit current of 30-50 times will burn the contacts, so the contact material should have good arc resistance and melting resistance. Solderability. Currently commonly used copper-bismuth alloy has good welding resistance, low current carrying value, and certain breaking capacity, but its strength is low, and the arc erosion is large, which reduces the life...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622H01H1/02H01H1/021
CPCC04B35/622C04B35/83C04B2235/425C04B2235/48C04B2235/614C04B2235/616C04B2235/6562C04B2235/6567H01H1/0203H01H1/021
Inventor 邵海成赵立军乔冠军刘桂武
Owner 内蒙古栢特新材料科技有限公司
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