Process for producing carbon/carbon heat insulation bottom board for high temperature furnace

A technology for high-temperature furnaces and bottom plates, which is applied in coking ovens, special forms of dry distillation, and the petroleum industry. It can solve problems such as difficulty in forming graphite heat-insulating bottom plates, unstable graphite product structure, and reduced equipment utilization, and achieves practicability. Strong, lightweight, and improved utilization

Active Publication Date: 2008-09-24
XIAN CHAOMA SCI TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When producing large-diameter heat-insulating bottom plates, it is difficult to form traditional graphite heat-insulating bottom plates, and the price is high; the structure of graphite products is not stable, the strength is low, and the thermal

Method used

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  • Process for producing carbon/carbon heat insulation bottom board for high temperature furnace

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] (1) Use 3K carbon fiber plain weave or twill cloth and thin carbon fiber mesh to alternately lay, and axial (that is, the thickness direction of the layer) needle punch into a full carbon fiber three-way structure preform, the needle punch density is 25 needles / cm 2 ; The density of the preform with a full carbon fiber structure is 0.20g / cm 3 ; Where K represents the number of tows in thousands.

[0026] (2) Furfural ketone resin vacuum impregnation and carbonization densification process: Under the pressure of -0.086MPa, the preform of the three-directional structure of the full carbon fiber in step (1) is immersed in the impregnation tank for 1.5 hours out of the tank and transferred to the carbonization furnace Carry out carbonization treatment at 900°C to obtain carbon / carbon products.

[0027] (3) The density of carbon / carbon products is 0.50g / cm 3 At that time, the densification process is over, and the carbon / carbon products are purified at a high ...

Example Embodiment

[0030] Example 2

[0031] (1) Using 6K carbon fiber plain weave or twill weave and thin carbon fiber mesh alternately, the axial direction (that is, the thickness direction of the layer) needle-punched full carbon fiber three-way structure preform, the needle punch density is 35 needles / cm 2 ; The density of the preform is 0.30g / cm 3 ; Where K represents the number of tows in thousands.

[0032] (2) Furfural ketone resin vacuum impregnation and carbonization densification process. Under a pressure of -0.092MPa, the preform of the three-directional structure of the full carbon fiber in step (1) is immersed in the impregnation tank for 2 hours, and then transferred to the carbonization after the tank is discharged. The furnace is carbonized at 950°C to obtain carbon / carbon products.

[0033] (3) The density of carbon / carbon products is 0.80g / cm 3 At that time, the densification process is over, and the carbon / carbon products are purified at high temperature under the condition of in...

Example Embodiment

[0036] Example 3

[0037] (1) Use 12K carbon fiber plain weave or twill cloth and thin carbon fiber mesh to alternately lay, the axial direction (that is, the thickness direction of the lay) needle punched full carbon fiber three-way structure preform, the needle punch density is 40 needles / cm 2 ; The density of the preform is 0.40g / cm 3 ; Where K represents the number of tows in thousands.

[0038] (2) Furfural ketone resin vacuum impregnation, carbonization and densification process, under the pressure of -0.098MPa, the full carbon fiber three-directional structure preform in step (1) is immersed in an impregnation tank for 2.5 hours, and then transferred to carbonization after being discharged from the tank The furnace is carbonized at 1100°C to obtain carbon / carbon products.

[0039] (3) The density of carbon / carbon products is 1.0g / cm 3 When the densification process is over, the carbon / carbon products are purified at high temperature under the condition of introducing chlori...

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Abstract

The present invention relates to a preparation method of C/C insulating bottom plate that is used for a high-temperature furnace. In the method, carbon fiber plain weaves or twill is laid alternately with fetus of thin carbon fiber network; axial needle prick is used for preparing the prefabricated body of the low-density insulating bottom plate; furfural acetone resin or phenolic resin is used for vacuum impregnation, curing, carbonizing and densifing the prefabricated body of the insulating bottom plate; the prefabricated body is repeatedly densified 2 to 4 times until the density reaches more than or equal to 0.50g/cm<3>; after the densification, the prefabricated body is processed through high-temperature purification under the conditions with chlorine or Freon; and the C/C insulating bottom plate, which is used for a high-temperature furnace, can be prepared after mechanical processing. The preparation method has the significant characteristics that: first, the conditions for densification are simplified, the costs are reduced, and the preparation method is suitable for producing large-size products; secondly, the resin carbon-based matrix reduces the thermal conductivity of the C/C insulating bottom plate, improves the effects of heat preservation in the hot field and saves energy; and thirdly, the C/C insulating bottom plate has high mechanical properties, and the service life is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a charcoal / charcoal heat-insulating bottom plate for a high-temperature furnace, and belongs to the technical field of heat-preservation and heat-insulation materials for a high-temperature furnace. Background technique [0002] Traditional high-temperature furnaces generally use graphite heat-insulating bottom plates, and the furnace temperature of high-temperature furnaces is generally above 1000°C. When producing large-diameter heat-insulating bottom plates, it is difficult to form traditional graphite heat-insulating bottom plates, and the price is high; the structure of graphite products is not stable, the strength is low, and the thermal conductivity is high. Traditional graphite products are easy to react with the environment in the high-temperature furnace. Use The service life is short and the replacement rate is high, which reduces the utilization rate of the equipment and increases the mainten...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/83C10B53/08
Inventor 谢乔肖志超李永军侯卫权苏君明彭志刚孟凡才姚西明张涛
Owner XIAN CHAOMA SCI TECH
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