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Method for preparing pitch-based foam carbon

A technology of pitch-based and foamed carbon is applied in the field of preparation of mesophase pitch-based foamed carbon, which can solve the problems of reducing the mechanical properties and thermal conductivity of foamed carbon, and achieve the effects of less defects, controllable bulk density, and improved strength.

Inactive Publication Date: 2010-12-29
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, defects, such as microcracks and secondary pores, will inevitably be formed on the pore walls and ligaments during the preparation process, which significantly reduces the mechanical properties and thermal conductivity of foamed carbon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The naphthalene-based mesophase pitch is crushed and passed through a 100-mesh sieve, and mixed according to the mass ratio of naphthalene-based mesophase pitch:mesophase carbon microspheres=90:10. After 2 hours of mixing, weigh 150g of the mixed powder, place it in a high-pressure reactor, fill it with nitrogen, exhaust the air in the kettle, close the exhaust valve, and then fill it with nitrogen to pressurize to 0.1MPa. Raise the temperature to 320°C, keep the temperature constant for 2 hours, then continue to raise the temperature to 500°C at a rate of 5°C / min, keep the temperature constant for 2 hours, and cool to room temperature naturally to obtain the pitch-based foam carbon raw meal. During the whole heating and constant temperature process, the foaming pressure in the kettle is always maintained at 0.1MPa by means of intermittent filling / deflation. Put the obtained pitch-based foam carbon raw material in a carbonization furnace, use positive pressure nitrogen ...

Embodiment 2

[0023] The naphthalene-based mesophase pitch is crushed and passed through a 100-mesh sieve, and mixed according to the mass ratio of naphthalene-based mesophase pitch:mesophase carbon microspheres=70:30. After 2 hours of mixing, weigh 150g of the mixed powder, place it in a high-pressure reactor, fill it with nitrogen, exhaust the air in the kettle, close the exhaust valve, and then fill it with nitrogen to pressurize to 3MPa at a rate of 5°C / min. Raise the temperature to 320°C, keep the temperature constant for 2 hours, then continue to raise the temperature to 500°C at a rate of 5°C / min, keep the temperature constant for 2 hours, and cool down to room temperature naturally to obtain the pitch-based foam carbon raw meal. During the whole heating and constant temperature process, the foaming pressure in the kettle is always maintained at 3MPa by means of intermittent filling / deflation. Put the obtained pitch-based foam carbon raw material in a carbonization furnace, use posit...

Embodiment 3

[0025] The carbonized pitch-based foam carbon substrate prepared by the preparation method in Example 2 is placed in a vapor deposition furnace, with propylene as the carbon source gas, nitrogen as the dilution gas, and a flow ratio of propylene: nitrogen = 1: 1, at 950 ° C, heating 15h, the pressure in the furnace is 1kPa, deposit pyrolytic carbon inside the carbonized pitch-based foam carbon matrix, and naturally cool to room temperature to obtain pitch-based foam carbon, the density of which is 0.64g / cm 3 , The compressive strength is 25.8MPa.

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PUM

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Abstract

The invention relates to a method for preparing a pitch-based foam carbon. The method comprises the following steps of: 1) mixing mesophase pitch with mesophase carbon micro sphere based on a mass ratio of 60 to 90:10 to 40, putting the mixture in a reactor, 2) guiding nitrogen to the reactor, rising temperature to 280-350 DEG C, maintaining for 1 to 2 h, rising temperature to 450-650 DEG C, maintaining for 2 to 4 h so as to obtain pitch-based foam carbon raw material, 3) rising temperature to 950-1050 DEG C, maintaining for 2 to 3 h, performing carbonization treatment under the protection of positive pressure nitrogen so as to obtain the carbonized pitch-based foam carbon base, and 4) based on a ratio of propylene to nitrogen of 1:1-2 under a pressure lower than 3kPa at 850 to 1000 DEG C, heating the carbonized pitch-based foam carbon base for 15 to 80 h so as to obtain the pitch-based foam carbon. The volume density of the pitch-based foam carbon prepared by using the method of the invention is 0.64-0.85 g / cm3 and the compression strength is 25.8-47.2 MPa. The pitch-based foam carbon can be wildly applied to carbon-base compound material, light structure material, catalyst carrier material, and the like.

Description

technical field [0001] The invention relates to a preparation method of mesophase pitch-based foam carbon. Background technique [0002] Foamed carbon is a reticulated porous material with a large pore size. Initially, resin was mostly used as raw material, and foamed charcoal was obtained by foaming, curing, and high-temperature carbonization with a foaming agent. The carbon form in this resin-based foamed carbon is glassy carbon which is difficult to graphitize, also known as reticulated vitreous foamed carbon. This foamed carbon has the characteristics of high porosity and small thermal conductivity, and is mainly used as heat insulation material, catalyst carrier or metal foam template. [0003] Generally speaking, the carbon foam before the 1990s basically used resin as the precursor. In the 1990s, a new generation of foamed carbon appeared, and its research direction mainly focused on the preparation of foamed carbon by using pitch and coal as precursors instead of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 闫志巧蔡一湘
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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