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Method for coating graphite

A graphite and coating technology, which is applied in the field of graphite coating treatment, can solve problems such as low graphitization degree, affecting performance, and unsatisfactory coating effect, so as to reduce specific surface area, increase graphitization degree, and improve coating overlay effect

Active Publication Date: 2010-10-20
湖南元锂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, the process of processing the coating material into powder can only achieve the particle size distribution of the prepared powder. The cumulative particle size of 50% is about 5-7 μm. Because the powder particle size of the coating material is too large, the coating effect is not ideal ; At the same time, the graphitization value of the coated graphite material produced by the current process is still low, which affects its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The following steps are used to coat graphite:

[0025] The first step: at a temperature of -160°C, grind the coating material asphalt into a powder with a cumulative particle size of 50% up to 1 μm;

[0026] The second step: adding the powdered asphalt powder and graphite powder prepared in the previous step into a high-speed mixer in a mass ratio of 18:100 to fully mix them;

[0027] Step 3: put the mixed composite powder into the graphite crucible, cover the crucible, and then carbonize. Set the carbonization furnace with 12 temperature zones in the range of 200-1600°C, and put the powder to be carbonized. The carbonization container is advanced in the carbonization furnace at a speed of 0.5 meters per hour, and passes through all temperature zones to complete the carbonization.

[0028] Step 4: After the above-mentioned carbonized composite powder is cooled, add catalyst boron carbide powder to it, the added mass is 5% of the above-mentioned carbonized composite po...

Embodiment 2

[0036] The coated graphite process is as follows:

[0037] Step 1: At a temperature of 0°C, grind the asphalt material used for coating into a powder with a cumulative particle size of 50% up to 0.5 μm;

[0038] The second step: adding the pitch powder, graphite powder and catalyst boron carbide prepared in the previous step into a high-speed mixer in a mass ratio of 5: 100: 10 to make it fully mixed;

[0039] Step 3: Put the above-mentioned mixed composite powder into the corundum crucible, put graphite sheet on the powder, cover the crucible cover again, and carry out carbonization. Zone, the carbonization container containing the powder to be carbonized is advanced in the carbonization furnace at a speed of 1 meter per hour, and passes through all temperature zones to complete the carbonization.

[0040] Step 4: Finally, graphitize the mixed composite powder containing the catalyst at a temperature of 2400°C.

[0041] Under the same detection conditions, the pitch-coated ...

Embodiment 3

[0046] The coated graphite process is as follows:

[0047] The first step: at a temperature of -50°C, grind the high-grade bitumen used for coating into a powder with a cumulative particle size of 50% up to 3 μm;

[0048] The second step: adding the asphalt powder and graphite powder used for the powdery coating prepared in the previous step into a high-speed mixer at a mass ratio of 20: 100 to make it fully mixed;

[0049] Step 3: Put the above-mentioned mixed composite powder into the graphite crucible, cover the crucible, and carry out carbonization. Set up 18 temperature zones in the carbonization furnace within the range of 200-1600°C, equipped with carbonization of the powder to be carbonized Use the container to advance in the carbonization furnace at a speed of 1.5 meters per hour, and go through all temperature zones to complete the carbonization.

[0050] Step 4: After the carbonized composite powder is cooled, add catalyst ferric chloride powder to it, the added ma...

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Abstract

The invention provides a method for coating graphite, which comprises the steps of: grinding a coating material into powder at a temperature of -160-0 DEG C, mixing with graphite powder (or adding a catalyst), and carbonizing and graphitizing to prepare the coating graphite material. A carbonizing container is made of the graphite or a graphite sheet is additionally arranged on powder body in the traditional carbonizing container. The coating material has low size distribution value, small powder particles and good coating effect, can effectively improve the graphitization degree of the coating graphite material, and reduce the specific surface area to improve the material performance.

Description

technical field [0001] The invention relates to a method for deep processing of graphite, in particular to a method for coating graphite. Background technique [0002] At present, the coating treatment of graphite is a common method to improve the performance of graphite materials. The commonly used process is to first process the coating material into powder, then mix the graphite and the coating material evenly, and then carbonize ——Graphitization treatment to obtain coated graphite material. But at present, the process of processing the coating material into powder can only achieve the particle size distribution of the prepared powder. The cumulative particle size of 50% is about 5-7 μm. Because the powder particle size of the coating material is too large, the coating effect is not ideal ; At the same time, the graphitization degree value of the coated graphite material produced by the current process is still low, which affects its performance. Contents of the invent...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCY02E60/10
Inventor 吴沙谢晓泓陶学锋
Owner 湖南元锂新材料科技有限公司
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