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A method for reducing the resistivity of graphite electrodes/joints

A graphite electrode and resistivity technology, applied in the directions of graphite, graphene, electrical components, etc., can solve the problems such as the conductivity can not be well reflected, and achieve the advantages of reduced fracture rate, simple operation process, and reduced surface resistivity of joints. Effect

Active Publication Date: 2020-09-11
FANGDA CARBON NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conductivity of graphene prepared by redox method and liquid phase exfoliation method cannot be well reflected due to structural defects, while the conductivity of graphene prepared by supercritical carbon dioxide method can reach 4.7×10 6 S / m, converted to a resistivity of 0.21μΩm, only 2.1%-4.7% of the resistivity of graphite electrodes (4.5-10μΩm), and 4.7%-6% of the resistivity of graphite joints (3.5-4.5μΩm)

Method used

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  • A method for reducing the resistivity of graphite electrodes/joints
  • A method for reducing the resistivity of graphite electrodes/joints
  • A method for reducing the resistivity of graphite electrodes/joints

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A method for reducing the resistivity of graphite electrodes / joints, the specific steps comprising the following steps:

[0018] (1) At room temperature, dissolve the phenolic resin in ethanol solvent, stir to dissolve the resin completely, until there is no precipitation or floc, then add graphene, stir, and disperse with ultrasonic wave at 40kHz for 5 minutes to obtain graphite The spraying agent of olefin slurry; Wherein the mass percent of each raw material component of spraying agent is: phenolic resin is 10wt%, and ethanol solvent is 80wt%, and the graphene prepared by supercritical carbon dioxide method is 10wt%;

[0019] (2) Evenly spray the graphene slurry obtained in step (1) on the inner hole thread of the graphite electrode and the outer thread of the joint, with a spray thickness of 100 μm;

[0020] (3) Dry the graphite electrode / joint sprayed with graphene slurry in a dry oven at 100°C for 0.5 hours, the surface resistivity of the graphite electrode / joint ...

Embodiment 2

[0023] A method for reducing the resistivity of graphite electrodes / joints, the specific steps comprising the following steps:

[0024] (1) At room temperature, dissolve the epoxy resin in ethanol solvent, stir to dissolve the resin completely, until there is no precipitation or floc, then add graphene, stir, and disperse with ultrasonic wave 20kHz for 3 minutes, and get The spraying agent of graphene slurry; Wherein the mass percent of each raw material component of spraying agent is: phenolic resin is 20wt%, and ethanol solvent is 75wt%, and the graphene prepared by supercritical carbon dioxide method is 5wt%;

[0025] (2) Immerse the graphite electrode / joint in the graphene slurry obtained in step (1) for 10 minutes and take it out;

[0026] (3) Dry the graphite electrode / joint sprayed with graphene slurry in a dry oven at 50°C for 1 hour, the surface resistivity of the graphite electrode / joint sample:

[0027]

Embodiment 3

[0029] A method for reducing the resistivity of graphite electrodes / joints, the specific steps comprising the following steps:

[0030] (1) At room temperature, dissolve the epoxy resin in ethanol solvent, stir to dissolve the resin completely, until there is no precipitation or floc, then add graphene, stir, and disperse with ultrasonic wave at 30kHz for 3min, and get The spraying agent of graphene slurry; Wherein the mass percent of each raw material component of spraying agent is: phenolic resin is 5wt%, and ethanol solvent is 93wt%, and the graphene prepared by supercritical carbon dioxide method is 2wt%;

[0031] (2) Evenly spray the graphene slurry obtained in step (1) on the inner hole thread of the graphite electrode and the outer thread of the joint, and the thickness of the spraying is controlled at 300 μm;

[0032] (3) The graphite electrode / joint sprayed with graphene slurry was fired in a baking furnace at 100°C for 1 hour, and the surface resistivity of the graph...

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Abstract

The invention relates to a method for reducing resistivity of a graphite electrode / joint. The method is characterized in that the graphite electrode / joint is used as a substrate; a graphene slurry is used as a spraying agent, wherein the graphene is prepared according to a supercritical carbon dioxide method; and after spraying or dipping, drying or calcinations is performed at a temperature of 50-100 DEG C for obtaining the graphite electrode / joint product, thereby reducing resistivity of the graphite electrode / joint. According to the method of the invention, through uniformly spraying or dipping one layer of graphene conductive slurry on the internal thread of the graphite electrode and the external thread of the graphite joint, and low-temperature 50-100 DEG C baking can be performed next to a baking furnace, thereby realizing no additional electric energy consumption and simple operation process, reducing resistivity of the inner surface of the electrode by 10-25%, reducing resistivity on the joint surface by 10-15%, reducing current overload and breakage rate, and improving safety in use of the electrode.

Description

technical field [0001] The invention belongs to the scientific and technical field of graphite electrode / joint materials, and in particular relates to a method for reducing the resistivity of graphite electrodes / joints. Background technique [0002] Graphite electrode / joint is a vital connection part in the use of graphite electrode. The joint plays a key role in the connection during electrode steelmaking. The quality of the joint is directly related to the use of the electrode in electric furnace steelmaking. The connection area formed by the graphite electrode and the joint is a place with large and complex electrical, thermal and mechanical loads, and it is also a common fracture site. According to relevant data, in electric furnace steelmaking, more than 80% of electrode use accidents are caused by broken joints or loose tripping. The carbon industry at home and abroad attaches great importance to the production of graphite electrode joints. [0003] Graphene is by far...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B7/06H05B7/10C01B32/184C01B32/21
CPCH05B7/06H05B7/10Y02P20/54
Inventor 张桂兰杨远继
Owner FANGDA CARBON NEW MATERIAL CO LTD