Preparing method of large-size low-heat-conductivity-coefficient high-strength foam carbon

A technology of low thermal conductivity and foam carbon, which is applied in the preparation/purification of carbon, etc., can solve the problems of foam carbon impact strength, low tensile strength, difficulty in controlling the overall structure of foam carbon, and difficulty in controlling the uniformity of foam carbon, etc., to achieve The effect of good overall structure, low cost and small particle size

Inactive Publication Date: 2014-07-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

Among them, the main factors restricting the performance and structure control of low thermal conductivity foamed carbon are reflected in the following aspects: 1) Phenolic resin is a main raw material for preparing low thermal conductivity foamed carbon, but the foamed carbon made from this raw material is degassed under high pressure Or it is easy to break during high-temperature carbonization, which makes it difficult to control the overall structure of carbon foam, especially for the preparation of large-sized carbon foam; The compressive strength is increased to 25MPa, but the mesophase carbon microspheres are heat-treated by high-temperature graphitization, and more solid-liquid interfaces are easily produced during the composite process with the carbonaceous precursor, which leads to the impact strength and tensile s

Method used

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  • Preparing method of large-size low-heat-conductivity-coefficient high-strength foam carbon

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] [Example One]

[0030] 2000g coal-based high softening point pitch with an average particle size of 5 microns, 200g of uncarbonized material of mesophase carbon microspheres and 50g of activated carbon fiber are mechanically mixed, and then placed in a 10L glass container, and then 3L of ethanol is added for stirring mixing. The above mixture was dried at 100°C, and then placed in a 6L high temperature autoclave (inner diameter 200mm) after drying. The high-temperature and high-pressure reaction vessel was introduced into the initial pressure of 3MPa, and then increased to 290°C at a temperature increase rate of 3°C / min, and kept at a constant temperature for 2h. Raise the temperature to 600°C at a heating rate of 0.2°C / min, and keep the temperature constant for 2h. At 600°C, quickly relieve the pressure to 1 atmosphere, and then continue to raise the temperature to 1000°C at a temperature of 5°C / min for carbonization to obtain foamed carbon. The final foamed carbon has...

Example Embodiment

[0031] [Example 2]

[0032] The weight of the uncarbonized material of the mesocarbon microspheres of [Example 1] was increased from 200 g to 500 g, and all other preparation conditions remained unchanged. The prepared carbon foam has a diameter of 200mm, a height of 200mm, a thermal conductivity of 0.101W / (m.k), a compressive strength of 31MPa, a volume shrinkage rate of 2.1% at 1500°C, and a density of 0.72g / cm 3 .

Example Embodiment

[0033] [Embodiment Three]

[0034] Increase the initial pressure into the high temperature and high pressure reactor in [Example 1] from 3 MPa to 4.5 MPa, and all other conditions remain unchanged. The prepared carbon foam has a diameter of 200mm, a height of 200mm, a thermal conductivity of 0.091W / (m.k), a compressive strength of 26MPa, a volume shrinkage rate of 2.2% at 1500°C, and a density of 0.69g / cm 3 .

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Abstract

The invention discloses a preparing method of large-size low-heat-conductivity-coefficient high-strength foam carbon. By adopting pitch with a high softening point as a raw material and adopting a spherical or one-dimensional structural material as a compound reinforcement, the foam carbon with a good integral structure and a uniform pore structure is prepared through a foaming process, wherein the diameter of the foam carbon is 200 mm, the height is 200 mm, the heat conductivity coefficient is 0.15 W/(m.k), the compression strength is higher than 30 MPa, the volume shrinkage rate at 1500 DEG C is lower than 3%, and the density is 0.3-0.8 g/cm<3>. The foam carbon is suitable to be used as a structural thermal insulation material, a heat preservation material and a wave absorption material, and can be widely used for the fields of spaceflight, aviation, navigation, energy-saving building, and the like.

Description

Technical field: [0001] The present invention relates to a large-size, low-thermal-conduction, high-strength foam carbon preparation technology, in particular to a carbon foam with a diameter of 200mm, a height of 200mm, a thermal conductivity lower than 0.15W / (m.k), a compressive strength higher than 30MPa, and a temperature of 1500°C. The volume shrinkage rate is less than 3%, and the density is 0.3-0.8g / cm 3 And the preparation method of foamed carbon with good overall structure and uniform pore structure. Background technique: [0002] As a honeycomb carbonaceous functional material, foam carbon not only has high strength, low thermal conductivity, low density, low thermal expansion coefficient, high temperature resistance, oxidation resistance, acid resistance, alkali resistance, low water absorption, no volatile substances, no Toxic gas, and has good formability and processability. Therefore, foam carbon can be widely used as thermal insulation materials for aerospac...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 詹亮陈然许耀霍云霞徐冰刘想何自国王艳莉
Owner EAST CHINA UNIV OF SCI & TECH
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