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A preparation method of porous carbon material anti-oxidation coating

A technology of porous carbon material and anti-oxidation coating is applied in the field of preparation of anti-oxidative coating of porous carbon material to achieve the effect of improving anti-oxidation performance and anti-oxidation performance

Active Publication Date: 2016-10-05
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A preparation method of porous carbon material anti-oxidation coating
  • A preparation method of porous carbon material anti-oxidation coating
  • A preparation method of porous carbon material anti-oxidation coating

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[0025] As mentioned above, the present invention provides a method for preparing an anti-oxidation coating of a porous carbon material, which may include the following steps: (1) preparing an anti-oxidation precursor solution; (2) impregnating the porous carbon material in an anti-oxidation coating (3) solvent-assisted deposition of antioxidant precursors; (4) drying and curing; and (5) pyrolysis. Preferably, the drying is carried out by means of supercritical drying; in addition, it is preferable that the curing is carried out by means of heat and pressure.

[0026] In some embodiments, the method of the present invention comprises the steps of:

[0027] (1) Prepare an antioxidant precursor solution by using an antioxidant precursor and a first solvent;

[0028] (2) impregnating the porous carbon material with the antioxidant precursor solution;

[0029] (3) soaking the impregnated porous carbon material in the second solvent, so that the precursor is deposited in the porou...

Embodiment 1

[0054] Polycarbosilane was dissolved in cyclohexane to prepare a polycarbosilane solution with a mass concentration of 2%. Fix the carbon airgel in the sealing tooling, vacuumize, the vacuum degree is -0.05MPa, keep it for 20min, then inject the polycarbosilane solution into the carbon airgel, and pressurize to 0.2MPa, the impregnation time is 7 days, The polycarbosilane solution can fully enter the porous structure of the carbon airgel.

[0055] After impregnation, the pressure-impregnated carbon airgel was placed in excess acetone as the second solvent for solvent-assisted deposition. After the solvent-assisted deposition is completed, supercritical drying is carried out again, and the temperature of the drying kettle of the supercritical equipment is raised to 50°C±6°C, and the pressure is maintained at 10-14MPa. The sample after supercritical drying was heated and cured under a pressure of 0.2MPa. The curing conditions were: from room temperature to 200°C, the heating rat...

Embodiment 2

[0059] Polycarbosilane was dissolved in xylene to prepare a polycarbosilane solution with a mass concentration of 2%. Fix the carbon airgel in the sealing tooling, vacuumize, the vacuum degree is -0.05MPa, keep it for 20min, then inject the polycarbosilane solution into the carbon airgel, and pressurize to 0.2MPa, the impregnation time is 7 days, The polycarbosilane solution can fully enter the porous structure of the carbon airgel.

[0060] After impregnation, the pressure-impregnated carbon airgel was placed in excess acetone as the second solvent for solvent-assisted deposition. After the solvent-assisted deposition is completed, supercritical drying is carried out again, and the temperature of the drying kettle of the supercritical equipment is raised to 50°C±6°C, and the pressure is maintained at 10-14MPa. The sample after supercritical drying was heated and cured under a pressure of 0.2MPa. The curing conditions were: from room temperature to 200°C, the heating rate was...

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Abstract

The invention provides a method for preparing an oxidation resistant coating of a porous carbon material. The method comprises the following steps: (1) preparing an oxidation resistant precursor solution by adopting an oxidation resistant precursor and a first solvent; (2) dipping the porous carbon material by utilizing the oxidation resistant precursor solution; (3) soaking the dipped porous carbon material into a second solvent, so that the precursor is deposited in a porous structure of the porous carbon material by utilizing the second solvent; (4) drying and curing the porous carbon material in the porous structure of which the precursor is deposited, wherein preferentially the drying operation refers to supercritical drying; and (5) performing high temperature pyrolysis on the dried and cured porous carbon material to form the oxidation resistant coating of the porous carbon material. According to the method disclosed by the invention, the uniformity of the oxidation resistant coating in the porous carbon material is effectively improved by adopting solvent assisted deposition, and the oxidation resistance of the porous carbon material is further improved. Meanwhile, the method has the advantages of simple process, wide application range and the like.

Description

technical field [0001] The invention relates to a preparation method of a porous carbon material anti-oxidation coating. Background technique [0002] Porous carbon materials have the advantages of good high-temperature stability, excellent thermal radiation barrier performance, and low density. They are currently ideal high-efficiency and lightweight insulation materials, and have broad application prospects in the field of ultra-high temperature insulation. In practical applications, the high-temperature aerobic environment can easily cause severe oxidation of porous carbon materials, thereby affecting its thermal insulation performance. In order to meet its application in the field of high temperature insulation, it is urgent to improve the oxidation resistance of porous carbon materials. [0003] It is an effective method to improve the oxidation resistance of carbon materials by insulating oxygen on the surface of carbon materials. Commonly used anti-oxidation coating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
Inventor 赵英民贺剑刘斌郭慧张凡李文静于新民孙同臣张迪
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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