Dipped anti-oxidation fluid capable of improving high temperature anti-oxidation performance of graphite products and application method thereof

A technology for high-temperature anti-oxidation and graphite products, applied in chemical instruments and methods, compositions for inhibiting chemical changes, graphite, etc., can solve the problems of low impregnation efficiency, low oxidation resistance temperature, etc., and achieve the effect of convenient operation and simple process

Active Publication Date: 2012-11-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a two-step impregnation method using two different impregnation liquids based on the existing impregnation method to improve the high-temperature oxidation resistance of graphite products. In the micropores, the reaction occurs in the graphite micropores and on the surface at the same time. After high-temperature heat treatment, an anti-oxidation film is formed to isolate oxygen and realize the high-temperature anti-oxidation performance of graphite, thus solving the problem of one-time immersion or multiple immersion in one immersion solution. Problems such as low oxidation temperature and low impregnation efficiency when the impregnating solution is suspended

Method used

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  • Dipped anti-oxidation fluid capable of improving high temperature anti-oxidation performance of graphite products and application method thereof
  • Dipped anti-oxidation fluid capable of improving high temperature anti-oxidation performance of graphite products and application method thereof
  • Dipped anti-oxidation fluid capable of improving high temperature anti-oxidation performance of graphite products and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] One weight component of the anti-oxidation dipping solution is selected: 50% of sodium hexametaphosphate and 50% of potassium aluminum sulfate. First dissolve the components and water at a ratio of 1:0.1 by weight, mix and stir the dissolved solution and heat it to about 100°C. 10h. The two components of the impregnation solution are: 30% sodium silicate, 70% sodium tetraborate, add water with a weight ratio of 1:3:3, stir and heat to about 100°C, and when the impregnation solution becomes clear, Put the graphite block into the impregnating solution and impregnate at normal pressure for 10h. Take out the impregnated graphite sample block and let it dry naturally or by heating. The treated graphite block is placed in a muffle furnace and heated to 1200°C at a heating rate of 10°C / min for 1 hour, and the oxidation weight loss is about 15%.

Embodiment 2

[0020] One weight component of the anti-oxidation dipping solution is selected: 50% of sodium hexametaphosphate and 50% of potassium aluminum sulfate. First dissolve the components and water at a ratio of 1:0.1 by weight, mix and stir the dissolved solution and heat it to about 100°C. 10h. The two components of the impregnation solution are: 40% sodium silicate, 60% sodium tetraborate, add water with a weight ratio of 1:3.3, stir and heat to about 100°C, and after the impregnation solution becomes clear, the graphite Put the block into the impregnating solution, and impregnate at normal pressure for 10h. Take out the impregnated graphite sample block and let it dry naturally or by heating. The treated graphite block was heated in a muffle furnace at a heating rate of 10°C / min to a constant temperature of 1200°C for 1 hour, and the oxidation weight loss was about 10%.

Embodiment 3

[0022] One weight component of the anti-oxidation dipping solution is selected: 50% of sodium hexametaphosphate and 50% of potassium aluminum sulfate. First dissolve the components and water at a ratio of 1:0.1 by weight, mix and stir the dissolved solution and heat it to about 100°C. 10h. The two components of the impregnation solution are: sodium tetraborate 50%, sodium hexametaphosphate 50%, add water with a weight ratio of 1:3.3, stir and heat to about 100°C, and when the impregnation solution becomes clear, put Put the graphite block into the impregnating solution and impregnate at normal pressure for 10h. Take out the impregnated graphite sample block and let it dry naturally or by heating.

[0023] Comparative test three:

[0024] Cut the graphite sample block into 1×1×1cm squares such as figure 1 As shown, without any treatment, put it in a muffle furnace and heat it to 1200°C at a heating rate of 10°C / min, and the condition when the temperature is constant for 1 h...

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Abstract

The invention relates to a dipped anti-oxidation fluid capable of improving high temperature anti-oxidation performance of graphite products and an application method thereof, and aims to improve inoxidizability of graphite products at a temperature of more than 1000 DEG C. Dipping of graphite with dipping liquid I and dipping liquid II is carried out under a normal pressure or a pressure of 0.1 to 0.6 MPa; the solute of dipping liquid I is composed of 50 to 80% of sodium hexametaphosphate and 20 to 50% of aluminum potassium sulfate, and the solute of dipping liquid II comprises 30 to 70% of sodium silicate and 30 to 70% of sodium tetraborate, and the weight of compositional components of the two solutes respectively sums to 100%; during utilization, a weight ratio of the solute of dipping liquid I to water is 1: 0.1-0.125, and a weight ratio of the solute of dipping liquid II to water is 1: 3.3-5.0. The graphite products obtained after two-step dipping have obviously improved high temperature antioxidation performance during the process of high temperature heat treatment.

Description

Technical field: [0001] The invention belongs to the field of anti-oxidation additives for graphite products, and in particular relates to an impregnated anti-oxidation liquid for improving the high-temperature anti-oxidation performance of graphite products and an application method thereof. Background technique: [0002] Graphite material has the characteristics of high temperature resistance, good electrical and thermal conductivity, thermal shock resistance, corrosion resistance and suitable self-lubrication, which makes it widely used, such as graphite electrodes, graphite carbon sleeves and sealing devices, etc., but graphite is in There is a very prominent disadvantage in high temperature applications, that is, it is easy to oxidize at high temperature, and graphite will generate CO and CO after oxidation. 2 Gas, the two gases dissipate quickly, reducing the volume of graphite and causing a loose state on the surface, which affects its mechanical properties. In parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K15/02C01B31/04C01B32/21
Inventor 叶树峰邓亚利仉小猛周旬魏连启王晓婧
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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