Improvements to methods for calefcation densification of a porous structure

A porous structure and densification technology, applied in applications, home appliances, ceramic products, etc., can solve problems such as poor energy efficiency

Inactive Publication Date: 2004-01-28
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] - a poor energy efficiency, since 50-90% of the thermal energy is lost through evaporation and not used for cracking; and

Method used

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  • Improvements to methods for calefcation densification of a porous structure
  • Improvements to methods for calefcation densification of a porous structure
  • Improvements to methods for calefcation densification of a porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The reactor used had an internal diameter of 200 mm and a height of 300 mm. The inductor located in the reactor has a height of 150 mm and has 6 helical turns with internal and external diameters of 175 mm and 195 mm respectively.

[0071] The susceptor used had a diameter of 80 mm and a height of 100 mm. The susceptor is completely covered by means of 3 carbon felt (density 0.40-0.45) parts to be densified:

[0072] - a hollow cylinder having internal and external diameters of 80 mm and 120 mm respectively covering its measured surface and a height of 100 mm;

[0073] - Two disks with a diameter of 120 mm and a thickness of 20 mm, covering the height and the bottom part of their two flat surfaces.

[0074] Fully covered with a felt made of two layers of Teflon GORE TBX  It is composed of materials and has the following characteristics:

[0075] - thickness of one layer: 0.2 mm;

[0076] - Filtration: only particles with a diameter of less than 7.5 microns pass th...

Embodiment 2

[0090] This embodiment concerns the densification of small carbon parts. Heating is performed by electrical resistance.

[0091] The heating element is a graphite rod with a diameter of 3 mm. The heating element surrounds the sample to be densified, which is a felt tube of carbon (density 0.1 ) with a diameter of 2 cm and a height of 3 cm. Fully wrapped in a felt, as in Example 1, made of two layers of GORE-TEX  Material composition.

[0092] The pressure is fixed at 0.1Mpa. The temperature was raised at a rate of 1000°C / h until reaching 100°C. The temperature was maintained at 1100° C. during 30 minutes, and then the temperature was lowered at a rate of 1000° C. / h.

[0093] The result is as follows:

[0094] - densification speed of 4 mm / h;

[0095] - Energy consumption of 110kWh / kg deposited carbon;

[0096] - Density is 1.8.

[0097] For comparison, under the same conditions without GORE-TEX  felt,

[0098] - The speed is 0.6mm / h;

[0099] - energy consumption...

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Abstract

The invention concerns a method for calefaction densification of a porous structure (mixed liquid-gas process) (5) which consists in immersing the porous structure in a liquid precursor, for example a hydrocarbon, and in heating the whole assembly to deposit the product for decomposition of said liquid precursor, for example of carbon, in the pores of said porous structure. The invention is characterised in that it consists in reducing the flow rate of liquid precursor penetrating into the porous structure, for example by means of a polytetrafluoroethylene filter (52) enclosing the structure, so as to reduce the vaporization phenomena of the liquid precursor around the porous structure to be densified.

Description

technical field [0001] The present invention is for a method of densification of porous structures, more precisely, the invention also relates to an improvement of the method, which allows to reduce the consumed electric energy and increase the speed of densification, and also improves the Homogeneity of the structure of the precipitated product. [0002] It is conceivable that a method of heat densification of a porous structure (gas-liquid mixing method) involves the precipitation in the interstices of the porous structure of a substance of the same or different composition as that of the structure by thermal decomposition of a liquid precursor. material to fill the gaps in the porous structure. [0003] The present invention is used for the densification of porous materials, especially felts, fabrics, needle-punched flocking and three-way pre-processed products, the increased mechanical strength of these materials, the excellent thermal insulation capabilities and Good im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/82C04B35/83C04B41/50C04B41/85
CPCC04B41/5001C04B41/009C04B35/83C04B41/85C04B41/4535C04B41/4554C04B35/52C04B38/00C04B41/45
Inventor P·戴维D·罗维莱恩F·马伦P·德尔海斯A·德雷M·特林奎科斯特
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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