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Graphite carbon sleeve gradient anti-oxidation coating and preparation method thereof

A gradient coating and graphite carbon technology, which is applied in the field of preparation of graphite anti-oxidation composite coatings, can solve the problems of ineffective formation of gradient coatings, no specific data given, low oxidation resistance temperature, etc., and achieve graphite carbon coatings The gradient anti-oxidation coating is uniform and dense, the impregnation efficiency is improved, and the bonding strength is good

Active Publication Date: 2013-12-11
江苏赛菲新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used pressure impregnation process, its pressure is too low, generally lower than 1.5MPa, for example, the impregnation pressure used in patent CN100534951C is 1.2-0.5MPa, and the highest anti-oxidation temperature is only 950°C; The pressure is 0.4-0.6MPa, which improves the wear resistance and flexibility of the graphite carbon sleeve, but no specific data is given for the high-temperature anti-oxidation effect; the phosphate impregnation pressure in the patent CN100425571C is 0.6MPa, and the impregnation efficiency is not high. The porosity is as high as 15%; the impregnation pressure used in patent CN101696121B is 1-1.5MPa, which is slightly higher, and the impregnation efficiency is greatly improved than that reported by other patents, but the high-temperature anti-oxidation temperature is still low; The formation effect of the layer is not great, and this patent adopts high-pressure impregnation, and the effect is significantly improved

Method used

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  • Graphite carbon sleeve gradient anti-oxidation coating and preparation method thereof
  • Graphite carbon sleeve gradient anti-oxidation coating and preparation method thereof
  • Graphite carbon sleeve gradient anti-oxidation coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Pretreatment of the graphite carbon sleeve: surface grinding and polishing of the graphite carbon sleeve, then cleaning, and drying in an oven;

[0032] 2) Take aluminum-containing polycarbosilane (PACS), dissolve it in xylene, heat and stir at 70°C to prepare a 40wt.% PACS xylene solution;

[0033] 3) Place the graphite sample block in the dipping tank, vacuumize it to -0.1MPa, inject the above-mentioned solution with a concentration of 40wt.% into the tank, keep the vacuum state and soak for 5 minutes, then apply a high pressure of 2MPa and soak for 2 hours, then from the dipping Take out the graphite carbon sleeve from the tank and dry it at 200°C for 4 hours;

[0034] 4) Put the dried graphite carbon jacket into the atmosphere furnace, pass in argon as a protective gas, then control the temperature rise rate of the atmosphere furnace to 0.1°C / min to 650°C for 2 hours, and then set the temperature at 2°C / min Heat up to 1400°C for 2 hours, then cool down to room t...

Embodiment 2

[0036] The pretreatment of graphite carbon sleeve and the preparation of impregnation solution are the same as in Example 1, and the impregnation, drying, high-temperature treatment, vacuum degree, and impregnation pressure (2MPa) are also the same; the concentration of impregnation solution is changed to: 60wt.%, the number of times of impregnation and cracking Change to 3 times, and the 3 times of dipping and cracking processes are all corresponding to Example 1; after 3 dips and cracks, the SiC gradient protective coating of the graphite carbon sleeve is obtained, that is, the graphite carbon sleeve anti-oxidation gradient coating. The prepared gradient coating can protect the graphite material in static air at 1100°C for 1000 hours, has an oxidation weight loss of 0.52wt.%, and can withstand 100 thermal shocks at 1100°C without falling off.

Embodiment 3

[0038] The pretreatment of graphite carbon sleeve and the preparation of impregnation solution are the same as in Example 1, and the impregnation, drying, high-temperature treatment and vacuum degree are also the same; the concentration of the impregnation solution is changed to 60wt.%, the impregnation pressure is changed to 5MPa, and the number of times of impregnation and cracking is changed to 3 times, and the 3 times of immersion and cracking processes are all corresponding to Example 1; after 3 times of immersion and cracking, the SiC gradient protective coating of the graphite carbon sleeve is obtained. The prepared gradient coating can protect the graphite material in static air at 1100°C for 1000 hours, has an oxidation weight loss of 0.50wt.%, and is resistant to thermal shocks at 1100°C for 100 times without falling off.

[0039] The resulting graphitic carbon sleeve (ARLX'TRA type) X-ray diffractometer analysis sample with SiC gradient protective coating, that is, g...

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Abstract

The invention relates to a graphite carbon sleeve gradient anti-oxidation coating and a preparation method thereof. The preparation method comprises the following steps: the surface of a graphite carbon sleeve is pretreated; polyaluminocarbosilane (PACS) serves as a precursor for preparing the graphite carbon sleeve gradient anti-oxidation coating; the PACS has the advantages of high ceramic production rate and good effects of anti-oxidation and high temperature resistance; the pre-treated graphite carbon sleeve is immersed in a xylene solution of the PACS under the vacuum condition, kept under the vacuum condition for 1-10 min, macerated under the condition of pressurizing 10 MPa, dried and placed in an electric furnace, raised to 1,100-1,600 DEG C, and is cracked for preparing the graphite carbon sleeve gradient anti-oxidation coating.

Description

technical field [0001] The invention relates to a preparation method of a graphite anti-oxidation composite coating, in particular to a process of high-pressure impregnation of SiC ceramic precursors, that is, aluminum-containing polycarbosilane (PACS), dissolved in xylene solution and then cracked to prepare graphite carbon sleeves Method for Gradient Antioxidant Coatings. Background technique [0002] Graphite carbon sleeves for hearth rolls used in silicon steel production are widely used because of their excellent heat resistance, self-lubricating properties and appropriate hardness. But its Achilles' heel is poor oxidation resistance, especially in the high temperature zone above 920 °C, the service life is extremely short, which affects the normal production, and the production cost is unbearable. Therefore, it is very important to improve the oxidation resistance of graphite carbon sleeves. [0003] The silicon carbide coating on the surface of the graphite carbon sl...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 张冀冯春祥马小民
Owner 江苏赛菲新材料有限公司
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