A kind of preparation method of foamed carbon outer surface sealing layer

A foamed carbon, outer surface technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of reducing the thermal conductivity of composite materials, but not solving the problems of high temperature aerobic environment stability of foamed carbon materials, so as to improve the high temperature resistance. The effect of oxidation ability, short cycle and simple process

Active Publication Date: 2018-09-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This patent proposes a method for preparing a carbon foam-aerogel composite structure, which can effectively reduce the thermal conductivity of the composite material, but it does not address the stability of the foam carbon material in a high-temperature aerobic environment

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  • A kind of preparation method of foamed carbon outer surface sealing layer

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Effect test

Embodiment 1

[0018] Doped TiO on the outer surface of carbon foam 2 Preparation method of sealing layer:

[0019] (1) Immerse the carbon foam in absolute ethanol, clean it with ultrasonic vibration for 20 minutes, take it out and dry it in an oven at 110°C for later use;

[0020] (2) SiO 2 , ZrO 2 、TiO 2 The ceramic powder is mixed evenly by ball milling according to the molar ratio of 1:0.5:0.5, the ball milling speed is 500r / min, and the ball milling time is 24h;

[0021] (3) Magnesium chloride hexahydrate is added in the mixed powder that step (2) obtains, magnesium chloride hexahydrate: mixed powder=1: 10, after mixing according to mass ratio, join in the organic solvent and be made into suspension, in the suspension The solid-liquid concentration is 5g / L, and the organic solvents are anhydrous ethanol and acetone;

[0022] (4) the carbon foam of step (1) is used as the negative electrode, and graphite is used as the positive electrode material, and the mixed ceramic powder is ele...

Embodiment 2

[0027] The outer surface of carbon foam is not doped with TiO 2 Preparation method of sealing layer:

[0028] (1) Immerse the carbon foam in absolute ethanol, clean it with ultrasonic vibration for 30 minutes, take it out and dry it in an oven at 100°C for later use;

[0029] (2) SiO 2 , ZrO 2 、TiO 2 The ceramic powder is mixed evenly by ball milling according to the molar ratio of 1:0.5:0, the ball milling speed is 500r / min, and the ball milling time is 24h;

[0030] (3) Magnesium chloride hexahydrate is added in the mixed powder that step (2) obtains, magnesium chloride hexahydrate: mixed powder=1: 10, after mixing according to mass ratio, join in the organic solvent and be made into suspension, in the suspension The solid-liquid concentration is 5g / L, and the organic solvents are anhydrous ethanol and acetone;

[0031] (4) the carbon foam of step (1) is used as the negative electrode, and graphite is used as the positive electrode material, and the mixed ceramic powder...

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Abstract

The invention relates to a preparation method of an outer surface sealing layer of foamy carbon. The preparation method is characterized by comprising the following steps: carrying out uniform ball-mill mixing on SiO2, ZrO2 and TiO2 ceramic powder in a molar ratio of 1 to (0.1-0.5) to (0-0.5), preparing suspension liquid, and depositing mixed ceramic powder on the outer surface of foamy carbon through electrophoretic deposition, wherein the concentration of mixed ceramic powder in the suspension liquid is 2g / L -10g / L; uniformly mixing a sodium polyacrylate solution, absolute ethyl alcohol and silica sol in a mass ratio of 1 to (1-5) to (10-20) to obtain mixed glue liquid, uniformly smearing the outer surface of a foamy carbon material being subjected to the electrophoretic deposition with the mixed glue liquid, carrying out thermal treatment at 200-300 DEG C in a vacuum environment, and repeatedly carrying out the step (6) for 3-8 times, so as to obtain a uniform and compact sealing layer material on the outer surface of foamy carbon. The preparation method has the advantages that (2) the sealing layer mainly consists of oxides, so that the high-temperature oxidation resistance of a composite material is improved; (2) a vacuum state is formed in the composite material, so that the high-temperature heat-insulating property of the composite material is improved; (3) the preparation temperature is low, the process is simple and rapid, and the cycle is short.

Description

technical field [0001] The invention relates to a preparation method of a sealing layer, in particular to a preparation method of a foamed carbon outer surface sealing layer. Background technique [0002] At present, most of the carbon foam materials use polymers as raw materials, such as thermosetting or thermoplastic resins such as phenolic resin and polyurethane. Porosity, used for impact energy absorption, catalyst carrier, porous electrode and gas filtration, etc. These include melamine foam carbonized carbon foam, which is a flexible foam carbon material with high resilience and a porosity of over 99%. The three-dimensional network structure forms a large number of small and medium-sized pore structures, and its pore size is generally 10 to 50 μm. , high specific surface area. Although the volume shrinkage rate after carbonization is as high as 90%, its internal structure well inherits the three-dimensional network porous structure of melamine foam, which is also due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/52C04B111/40
CPCC04B41/009C04B41/5024C04B41/5042C04B41/52C04B2111/40C04B14/022C04B38/00C04B41/4564C04B41/5035C04B41/5041C04B41/5029C04B41/522C04B41/4535C04B41/463C04B41/4857
Inventor 陈照峰余盛杰汪洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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