A method of electrochemistry-impregnation collaborative preparation of graphite resistance to high temperature composite coating

A composite coating and high-temperature-resistant technology, which is applied in the field of graphite high-temperature coating, can solve the problems of inability to meet the oxidation resistance requirements of graphite materials, poor bonding between the coating and the substrate, and insufficient air tightness of the coating, so as to facilitate industrial production and application , not easy to fall off, good air tightness effect

Active Publication Date: 2022-08-05
江西宁新新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the single silicon carbide coating is easy to fall off due to poor bonding between the coating and the substrate; on the other hand, the airtightness of the coating is not enough, which cannot meet the oxidation resistance requirements of graphite materials. Coating preparation method for layer anti-oxidation effect

Method used

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  • A method of electrochemistry-impregnation collaborative preparation of graphite resistance to high temperature composite coating
  • A method of electrochemistry-impregnation collaborative preparation of graphite resistance to high temperature composite coating
  • A method of electrochemistry-impregnation collaborative preparation of graphite resistance to high temperature composite coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Graphite base material is selected, the surface is polished and ultrasonically treated with anhydrous ethanol. After the surface is dried, it is placed in an oven and placed at 100 ° C for 2 hours until use.

[0028] (2) Preparation of matrix suspension: silicon carbide 18g / L, alumina 5g / L, aluminum phosphate 8g / L, phenolic resin 10g / L, nano silicon powder 6g / L, graphite powder 3g / L, dodecyl Sodium benzenesulfonate 2g / L and the rest were added to 1L with ethanol, followed by ultrasonic treatment for 60min to obtain a matrix suspension.

[0029] (3) Preparation of phosphate coating: weigh 35g of aluminum dihydrogen phosphate, 7g of sodium hexametaphosphate, 2g of nano-alumina, 3g of silicon dioxide, 1g of sodium dodecylbenzenesulfonate, and 52g of solvent water, and then carry out 60min of Ball milling to obtain phosphate coating;

[0030] (4) Fix it with an electrochemical clamp, adjust and place it in parallel between two high-purity graphite blocks, connect the w...

Embodiment 2

[0036] (1) Graphite base material is selected, the surface is polished and ultrasonically treated with anhydrous ethanol. After the surface is dried, it is placed in an oven and placed at 100 ° C for 2 hours until use.

[0037] (2) Preparation of matrix suspension: 10g / L of silicon carbide, 5g / L of alumina, 9g / L of aluminum phosphate, 12g / L of phenolic resin, 10g / L of nano-silicon powder, 4g / L of graphite powder, dodecyl Sodium benzenesulfonate 2g / L and the rest were added to 1L with ethanol, followed by ultrasonic treatment for 60min to obtain a matrix suspension.

[0038] (3) Preparation of phosphate coating: weigh 25g of aluminum dihydrogen phosphate, 10g of magnesium dihydrogen phosphate, 7g of sodium hexametaphosphate, 1.5g of nano-alumina, 3.5g of silicon dioxide, 1g of sodium dodecylbenzenesulfonate, Solvent water 52g, then carry out the ball milling treatment of 60min, obtain phosphate dipping solution;

[0039] (4) Fix it with an electrochemical clamp, adjust and pla...

Embodiment 3

[0045] (1) Graphite base material is selected, the surface is polished and ultrasonically treated with anhydrous ethanol. After the surface is dried, it is placed in an oven and placed at 100 ° C for 2 hours until use.

[0046] (2) Preparation of matrix suspension: 10g / L of silicon carbide, 5g / L of alumina, 9g / L of aluminum phosphate, 12g / L of phenolic resin, 10g / L of nano-silicon powder, 4g / L of graphite powder, dodecyl Sodium benzenesulfonate 2g / L and the rest were added to 1L with ethanol, followed by ultrasonic treatment for 60min to obtain a matrix suspension.

[0047] (4) Fix it with an electrochemical clamp, adjust and place it in parallel between two high-purity graphite blocks, connect the working electrode, and use the calomel electrode as the reference electrode, select CHI606 electrochemical workstation, i-t curve, set voltage 10V, time 250S, electrochemical deposition in substrate suspension.

[0048] (5) After the graphite substrate is coated by electrochemical ...

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Abstract

The invention provides a method for preparing a graphite high temperature resistant composite coating by electrochemical-impregnation synergy. The coating is placed in an oven to dry the surface solvent, then dipped in phosphate coating or brushed with phosphate coating, and then the graphite substrate is pre-heated, and finally sintered to form a high temperature resistant coating on the graphite substrate. Composite coating. The high temperature resistant coating has good oxidation resistance and protects the graphite substrate.

Description

technical field [0001] The invention relates to a method for preparing a graphite high temperature resistant composite coating by electrochemical-impregnation synergy, and belongs to the technical field of graphite high temperature coating. Background technique [0002] Graphite has the characteristics of high density and high strength. It is a good high-temperature structural material and can be used as nuclear graphite, electrodes for EDM, structural materials for rocket technology, and aluminum plating. Graphite is widely used in many occasions, especially under high temperature conditions, graphite has good high temperature strength. However, its fatal problem is that in the presence of oxygen, it is rapidly oxidized, which seriously affects the performance and service life. Therefore, it is necessary to improve the oxidation resistance of graphite. The usual practice is to arrange a coating on the graphite substrate to improve the oxidation resistance of graphite. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89C04B41/52
CPCC04B41/89C04B41/52C04B41/5096C04B41/5059C04B41/5001C04B41/4564C04B41/5035C04B41/5031C04B41/5015C04B41/4539C04B41/0072
Inventor 吴相福陈香萍田家利邓达琴洪文晶李海航李江标刘春根邓聪秀
Owner 江西宁新新材料股份有限公司
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