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Method for preparing high temperature furnace used carbon/carbon insulating cylinders

A technology of heat preservation cylinder and high temperature furnace, which is applied in the field of heat preservation and heat insulation materials for high temperature furnace, can solve the problem that the heat preservation cylinder is not seen, and achieve the effect of avoiding repeated high temperature thermal shock test, long service time and reducing thermal conductivity.

Inactive Publication Date: 2009-06-03
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is no relevant data report on the scheme of obtaining the prefabricated body with carbon cloth and mesh tire needle punching method, and then preparing a low-density insulation cylinder through a series of densification methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Adopt 3K carbon fiber plain weave cloth and thin carbon fiber net to alternately lay, radial needle punching all carbon fiber structure insulation cylinder preform; the density of the preform is 0.12g / cm 3 , Where K represents the number of carbon fiber tows;

[0026] (2) Chemical vapor deposition (CVI) treatment, the flow rate of nitrogen and propylene in the CVI furnace are both 3.0m 3 / h, the deposition temperature is 850℃, and the temperature will be lowered after the deposition time is 30 hours;

[0027] (3) Resin impregnation and surface hardening treatment process, using phenolic resin with a solid content of 45% to impregnate and densify the heat preservation cylinder preform, so that the surface of the heat preservation cylinder preform is hardened, which is convenient for processing;

[0028] (4) After machining, paste the graphite paper on the inner and outer surfaces of the insulation cylinder with an adhesive, and transfer it to the carbonization furnace fo...

Embodiment 2

[0033] (1) Adopt 12K carbon fiber twill and thin carbon fiber mesh alternately, and radially needle punch the preform of the whole carbon fiber structure insulation cylinder; the density of the preform is 0.18g / cm 3 , Where K represents the number of carbon fiber tows;

[0034] (2) Chemical vapor deposition (CVI) treatment, the flow rates of nitrogen and propylene in the CVI furnace are both 6.0m 3 / h, the deposition temperature is 950℃, and the temperature will be lowered after the deposition time is 60 hours;

[0035] (3) Resin impregnation and surface hardening treatment process, using phenolic resin with a solid content of 60% to impregnate and densify the insulation cylinder preform, so that the surface of the insulation cylinder is hardened and easy to process;

[0036] (4) After machining, paste the graphite paper on the inner and outer surfaces of the insulation cylinder with an adhesive, and transfer it to the carbonization furnace for carbonization treatment at 950°C;

...

Embodiment 3

[0041] (1) Using 24K carbon fiber plain weave cloth and thin carbon fiber nets alternately laid, radially needle punched all carbon fiber structure insulation cylinder preform; the density of the preform is 0.20g / cm 3 , Where K represents the number of carbon fiber tows;

[0042] (2) Chemical vapor deposition (CVI) treatment, the flow rate of nitrogen and propylene in the CVI furnace are both 8.0m 3 / h, the deposition temperature is 1200℃, and the temperature will be lowered after the deposition time is 100 hours;

[0043] (3) Resin impregnation and surface hardening treatment process, using phenolic resin with a solid content of 80% to impregnate and densify the thermal insulation cylinder preform, so that the surface of the thermal insulation cylinder is hardened and easy to process;

[0044] (4) After machining, paste the graphite paper on the inner and outer surfaces of the insulation cylinder with an adhesive, and transfer it to the carbonization furnace for carbonization tre...

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Abstract

The invention discloses a method for preparing high temperature furnace used carbon / carbon insulating cylinders, which comprises the following steps: preparing a low-density insulating cylinder prefabricated part by adopting the alternative layering and the radial acupuncture of carbon fiber plain cloth or twill cloth and thin carbon fiber net tire; densifying the insulating cylinder prefabricated part by the combination of gas phase sedimentation and resin dipping; sticking graphite paper on the inner surface and the outer surface of the insulating cylinder after the densification process; and then preparing a high temperature furnace used carbon / carbon insulating cylinder by machining after carbonizing, so that, the density of the carbon / carbon insulating cylinder is 0.25 to 0.50 g / cm<3>. The invention has the following advantages: 1, the conditions of the densification technique is simplified so as to reduce the cost, therefore, the invention is suitable for producing large-sized insulating cylinder products; 2, using resin carbon basal body, the heat conductivity of the carbon / carbon insulating cylinder material is reduced, the thermal field insulating effect is improved, and the energy consumption is saved; and 3, graphite paper is stuck to the inner surface and the outer surface of the insulating cylinder so as to reflect heat effectively and improve the insulation performance.

Description

Technical field [0001] The invention belongs to the field of heat preservation and heat insulation materials for high temperature furnaces, and specifically relates to a preparation method of a carbon / carbon heat preservation cylinder for high temperature furnaces. Background technique [0002] Carbon / carbon composite material has outstanding characteristics such as good ablation resistance, good thermal shock resistance, low thermal conductivity, high damage tolerance, light weight, and high high temperature strength. It has outstanding advantages as a carbon / carbon insulation cylinder for high-temperature furnaces. . Southern Boyun New Materials Co., Ltd. proposed in the patent application number 200610136811.X that the carbon felt is treated at high temperature and then added with a curing agent. After carbonization and chemical vapor deposition, a high-purity cured felt is prepared. Japanese KOMATSU Electronic Metal Materials Company, Toyo Carbon and French SNECMA MOTEURS res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/84
Inventor 谢乔侯卫权肖志超苏君明胡振英李永军
Owner XIAN CHAOMA SCI TECH
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