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Size defining method for preparing intermediate phase asphalt base foam carbon

A technology of mesophase pitch and carbon foam, which is applied in the field of size-limited production of mesophase pitch-based carbon foam, can solve the problems of increasing the cost of foam carbon equipment, increasing the cost of foam carbon operation, and complicated operation process, so as to reduce operating costs, The effect of reducing equipment cost and simplifying the preparation process

Inactive Publication Date: 2006-10-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this process requires the foaming equipment to be airtight and pressure-resistant, thus increasing the equipment cost for producing foamed carbon; It was released in vain before, which not only complicates the operation process, but also increases the operating cost of producing foam carbon

Method used

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  • Size defining method for preparing intermediate phase asphalt base foam carbon
  • Size defining method for preparing intermediate phase asphalt base foam carbon
  • Size defining method for preparing intermediate phase asphalt base foam carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 4.0 g of petroleum-based mesophase pitch micropowder (through a 180 mesh sieve) with a mesophase content of 98% (volume) as a raw material, and its softening point is 290° C. Place the weighed mesophase pitch raw material in a covered stainless steel foaming container with a cylindrical space, and then vibrate the mesophase pitch powder. The cylindrical space size of the stainless steel foaming container is φ30mm×25mm. The material volume accounts for 2 / 5 of the volume of the foamer. Then the foaming container was placed in a muffle furnace to raise the temperature to 460°C at a heating rate of 200°C / min. After staying at this temperature for 0.5h, it was cooled at a cooling rate of 1°C / min to obtain foamed charcoal. The foamed carbon was placed in a tubular oxidation furnace and raised to 350°C at a rate of 0.05°C / min, and then cooled at a rate of 8°C / min after constant temperature for 1 hour to obtain oxidized foamed carbon. Pass 1m during the oxidation proces...

Embodiment 2

[0021] Weigh 4.5g of the above-mentioned mesophase pitch micropowder, add it into the foaming container according to the steps in Example 1, and foam it under the same foaming conditions after vibration. In this case, the free space after filling the foam container is φ30mm×11.3mm. Other process conditions are the same as in Embodiment 1. The average pore size, porosity, and open porosity data of the obtained carbonized and graphitized carbon foams are shown in Table 2.

[0022]

Embodiment 3

[0024] Weigh 5.0 g of the above-mentioned mesophase pitch micropowder, add it into the foaming container according to the steps in Example 1, and foam it under the same foaming conditions after vibration. Other process conditions are the same as in Embodiment 1. The scanning electron micrographs of the obtained carbonized and graphitized mesophase pitch-based carbon foams are as follows: image 3 and Figure 4 As shown, their average pore size, porosity, and open porosity data are shown in Table 3.

[0025]

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Abstract

The invention discloses a size-limited production method of mesophase pitch-based foam carbon. It belongs to the preparation technology of mesophase pitch-based foam carbon. The method includes the following steps: adding mesophase pitch or foaming agent and mesophase pitch into a constant-volume container at normal pressure, and then foaming at a temperature above the softening point; placing the foamed carbon in an oxidation furnace for oxidation treatment Carry out carbonization of the foamed carbon under the protection of an inert gas; perform graphitization treatment on the carbonized foamed carbon in a graphitization furnace under the protection of an inert gas to obtain a foamed carbon product. The advantage of the present invention is that: the foaming equipment does not use airtight pressurized equipment, thereby reducing the equipment cost; at the same time, the foaming process does not use inert gas, thereby eliminating the operation process of inflation and degassing, which not only reduces the pressure caused by the inert gas. The resulting operating cost also simplifies the preparation process. The invention can conveniently adjust the pore structure, density and strength of the foamed carbon, and the pore structure of the foamed carbon product is uniform.

Description

technical field [0001] The invention relates to a size-limited production method of mesophase pitch-based foam carbon. It belongs to the preparation technology of mesophase pitch-based foam carbon. Background technique [0002] Mesophase pitch-based foam carbon is a new type of carbon material with low density, high strength, high thermal conductivity, high electrical conductivity, fire resistance and impact resistance obtained after foaming, carbonization and graphitization of mesophase pitch. At the same time, it has the acid and alkali resistance and particularly low thermal expansion performance of carbon materials, so that this material has broad application prospects in various fields. Such as anti-solar radiation heat transfer systems that can be used for satellites, space shuttles and other aircraft; shock-resistant and noise-reducing materials for rocket launching platforms; large-scale heat exchangers that can be used in ordinary chemical plants (especially for ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C01B31/04C08J9/00C08J9/02B29C67/20
Inventor 李同起王成扬
Owner TIANJIN UNIV
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