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Oxidation-resistant graphite electrode surface coating and preparation process thereof

A graphite electrode and anti-oxidation technology, which is applied in the field of oxidation-resistant graphite electrode surface coating and its preparation process, can solve the problems of SiC coating that cannot be used, consumes a lot, and is expensive, so as to improve the compactness and prevent Effect of oxidation and quality improvement

Inactive Publication Date: 2019-04-26
HEFEI CARBON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glass coating is volatile at high temperature, and its own consumption in the anti-oxidation process is too large. Therefore, it can only play an anti-oxidation protection function at a lower temperature; the metal coating is mainly made of some high-melting point metals to prepare anti-oxidation coatings. layer, so that the material has a certain oxidation resistance, the cost is high, and it is not suitable for large-scale industrial applications; while the ceramic coating is mainly coated with SiC at present, but the SiC coating cannot be used in an oxygen atmosphere, which limits the use of graphite devices. scope

Method used

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Examples

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Effect test

preparation example Construction

[0032] A kind of preparation technology of oxidation-resistant graphite electrode surface coating, its concrete steps are as follows:

[0033] Step 1, the raw material is crushed, and the SiC, Al 2 o 3 and ZrO 2 be crushed separately;

[0034] Step 2, sieve, select 150 mesh, 200 mesh, 1000 mesh and 2000 mesh separation sieves for the above broken SiC, Al 2 o 3 and ZrO 2The powder is sieved to obtain SiC and Al with a large particle size of 75-106um 2 o 3 and ZrO 2 Raw materials, 13-75um medium particle size SiC, AL 2 o 3 and ZrO 2 Raw material and 6.5-13um small particle size SiC, Al 2 o 3 and ZrO 2 raw material.

[0035] Step 3, preparation of the transition layer coating, select 8-10 parts of large particle size SiC, 10-12 parts of medium particle size SiC and 27-33 parts of small particle size SiC to mix and put them into the reaction container, and then add a certain amount of SiC to the container in sequence Stir the solvent methanol, ethanol, stearic acid ...

Embodiment 1

[0047] a. Using a pulverizer to process SiC and Al 2 o 3 and ZrO 2 After crushing separately, select a separation sieve to sieve it into 75um large-grained SiC, Al 2 o 3 and ZrO 2 Raw material, 13um medium particle size SiC, Al 2 o 3 and ZrO 2 Raw materials and 6.5um small particle size SiC, Al 2 o 3 and ZrO 2 raw material.

[0048] b. Preparation of transition layer coating, select 8 parts of large particle size SiC, 10 parts of medium particle size SiC and 27 parts of small particle size SiC to mix and put them into the reaction container, then add 25 parts of methanol, 30 parts of ethanol, 2 parts of Stir after stearic acid and 12 parts of acrylic resin, set the temperature in the reaction vessel at 28°C, set the stirring speed of the stirrer in the vessel at 1000r / min, and obtain a transition layer with a viscosity of 925MPa S after the mixed material is stirred evenly Paint ready for use.

[0049] c. Preparation of sealing layer coating, select 5 parts of larg...

Embodiment 2

[0054] a. Using a pulverizer to process SiC and Al 2 o 3 and ZrO 2 After crushing separately, select a separation sieve to sieve it into 90um large-grained SiC, Al 2 o 3 and ZrO 2 Raw material, 40um medium particle size SiC, Al 2 o 3 and ZrO 2 Raw materials and 10um small particle size SiC, Al 2 o 3 and ZrO 2 raw material.

[0055] b. Preparation of transition layer coating, select 9 parts of large particle size SiC, 11 parts of medium particle size SiC and 30 parts of small particle size SiC to mix and put them into the reaction container, then add 28 parts of methanol, 32 parts of ethanol, 4 parts of Stir after stearic acid and 15 parts of acrylic resin, set the temperature in the reaction vessel at 30°C, set the stirring speed of the stirrer in the vessel at 1200r / min, and obtain a transition layer with a viscosity of 970MPa S after the mixed material is stirred evenly Paint ready for use.

[0056] c. Preparation of sealing layer coating, select 6 parts of large...

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Abstract

The invention discloses an oxidation-resistant graphite electrode surface coating and a preparation process thereof. The oxidation-resistant coating comprises the following raw materials in parts by mass: 45 to 55 parts of SiC, 32 to 38 parts of AL2O3, 25 to 36 parts of ZrO2, 25 to 30 parts of solvent methanol, 30 to 35 parts of solvent ethanol, 2 to 5 parts of dispersant stearic acid and 12 to 18parts of a binding agent acrylic acid resin. The oxidation-resistant coating is prepared by the following steps: pulverizing the raw materials, sieving, preparing transition layer coating, preparingsealing layer coating, performing graphite electrode surface pretreatment, performing graphite electrode surface coating, performing vacuum sintering and performing scanning electron microscope representation. The oxidation-resistant coating of silicon carbide-aluminum oxide-zirconium oxide (SiC-AL2O3-ZrO2) is a composite coating, wherein the SiC belongs to a transition layer and is used for solving the conflict that the thermal expansion coefficient between a graphite composite material and the coating is not matched; and the AL2O3 and the ZrO2 serve as a barrier layer to provide a barrier for diffusion of oxygen, so that oxidation of the graphite electrode is avoided.

Description

technical field [0001] The invention relates to graphite electrode surface treatment technology, in particular to an oxidation-resistant graphite electrode surface coating and a preparation process thereof. Background technique [0002] Graphite electrode refers to petroleum coke, pitch coke as aggregate, coal tar pitch as binder, a kind of resistant electrode made by calcination of raw materials, crushing and grinding, batching, kneading, molding, roasting, impregnation, graphitization and mechanical processing. High-temperature graphite conductive materials are called artificial graphite electrodes (referred to as graphite electrodes) to distinguish them from natural graphite electrodes prepared from natural graphite. [0003] Graphite material begins to oxidize from about 400°C, and the oxidation increases sharply after exceeding 750°C, and the oxidation also intensifies as the temperature increases. Oxidation corrosion under such high temperature conditions will lead to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B41/89C04B41/87
CPCC04B35/565C04B35/62222C04B41/009C04B41/52C04B41/87C04B41/89C04B2235/3217C04B2235/3244C04B35/522C04B41/5059C04B41/5031C04B41/5042
Inventor 夏子跃宋云英
Owner HEFEI CARBON CO LTD
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