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High-temperature resistant carbon fiber heat insulation felt

A technology of carbon fiber and thermal insulation felt, which is applied in the field of carbon/carbon composite prefabricated fiber felt, which can solve the problems of mesh tire breakage, complexity, and cost increase

Inactive Publication Date: 2012-02-08
SHANGHAI DINGYI INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second is to pre-oxidize the polyacrylonitrile fiber precursor and then process it with mixed oil agent, curl it, heat-set it, chop it, open it, comb it into a mesh tire, and then stack it and needle it. The benefits of this method It is the pre-oxidized fiber directly into felt, which can be made into a felt with a thickness of 5-200mm. Its disadvantages are that the production process is too many and complicated, and the processing cost is high. Due to the poor cohesion of the pre-oxidized fiber itself, although it is mixed with oil Treatment and curling, heat setting treatment, but it is easy to cause mesh tire breakage in the continuous production process
However, except for the direct use of carbon fiber to make felt, other process conditions are similar to the third method. Due to chemical or steam pretreatment, the process is increased; and multiple alternate laminations are required, so continuous production is difficult.
Moreover, the proportion of continuous carbon fiber filaments is greater than that of short filaments, so the cost is greatly increased, which is not conducive to civilian development
The three-dimensional prefabrication described in this patent also has a bulk density of 0.4-0.8 g / cm 3 , the bulk density is also not suitable for heat insulation materials

Method used

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  • High-temperature resistant carbon fiber heat insulation felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) 320K, the polyacrylonitrile preoxygenated fiber of 10-15 micron wire diameter is cut into the short fiber that length is 100 millimeters through XPD140 type chopping machine.

[0065] (2) Open in the 800 type opener.

[0066] (3) It is transported to the 150B air-laid equipment for air-laid by airflow. Its thickness is 10-30mm net tire.

[0067] The air-laid machine adjusts the air flow rate of 10-20 m / s to adjust the direction of the upper air return of the cotton box and the direction of the nodding, and adjusts the content and arrangement direction of the fibers in the three-dimensional direction, so that the fiber content in the X-Y plane layer is high, and the Z There are few fibers. After the net tire is evenly treated by 3 groups of 6 transfer rollers. And at a speed of 3.6 m / min, it is sent to multiple pressure rollers for rolling to form a thin net tire with a relatively stable density. The content of the layer in the X-Y plane is high, and the weight o...

Embodiment 2

[0080] (1) 320K, the polyacrylonitrile preoxygenated fiber of 10-15 micron wire diameter is cut into the short fiber that length is 100 millimeters through XPD140 type chopping machine.

[0081] (2) Open in the 800 type opener.

[0082] (3) It is transported to the 150B air-laid equipment for air-laid by airflow. Its thickness is 10-30mm net tire.

[0083] The air-laid machine adjusts the air flow rate of 10-20 m / s to adjust the direction of the upper air return of the cotton box and the direction of the nodding, and adjusts the content and arrangement direction of the fibers in the three-dimensional direction, so that the fiber content in the X-Y plane layer is high, and the Z There are few fibers. After the net tire is evenly treated by 3 groups of 6 transfer rollers. And at a speed of 3.6 m / min, it is sent to multiple pressure rollers for rolling to form a thin net tire with a relatively stable density. The content of the layer in the X-Y plane is high, and the weight o...

Embodiment 3

[0095] (1) 320K, the polyacrylonitrile preoxygenated fiber of 10-15 micron wire diameter is cut into the short fiber that length is 100 millimeters through XPD140 type chopping machine.

[0096] (2) Open in the 800 type opener.

[0097] (3) It is transported to the 150B air-laid equipment for air-laid by airflow. Its thickness is 10-30mm net tire.

[0098] The air-laid machine adjusts the air flow rate of 15 m / s to adjust the direction of the upper air flow of the cotton box and the direction of the nodding, and adjusts the content and arrangement direction of the fibers in the three-dimensional direction, so that the fiber content in the X-Y plane layer is high, and the Z-direction fiber content is high. rare. After the net tire is evenly treated by 3 groups of 6 transfer rollers. It is sent to multi-channel press rollers at a speed of 3.6 m / min to form a thin mesh tire with stable relative density. The press pressure is 35 kg, and the fiber content in the X-Y plane layer ...

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Abstract

The invention relates to a high-temperature resistant polyacrylonitrile-based carbon fiber heat insulation felt, a preparation method and the use thereof. The ratio of fiber parts on X-Y planes to those in Z direction of the high-temperature resistant polyacrylonitrile-based carbon fiber heat insulation felt is 50:1-250:1; and polyacrylonitrile-based carbon fiber substrate with a chop length of 50 to 150mm is prepared into the polyacrylonitrile-based carbon fiber heat insulation felt with a thickness of 8 to 12mm, a gram weight of 500 to 700g / cm<2>, and a tensile strength of 12 to 50N / 2cm. The polyacrylonitrile-based carbon fiber heat insulation felt can be used for preparing carbon / carbon composite heat insulation plates.

Description

technical field [0001] The invention belongs to the field of prefabricated fiber mats of carbon / carbon composite materials, and in particular relates to a high-temperature-resistant carbon fiber heat-insulating felt and a method for manufacturing a high-temperature-resistant carbon fiber heat-insulating felt with high production efficiency and low cost. Background technique [0002] Carbon fiber felt is a well-known blank material for the manufacture of carbon / carbon composite structural materials and carbon / carbon composite thermal insulation materials. Carbon / carbon composite insulation materials are widely used in aerospace, communication optical fiber, new energy, high-performance ceramic manufacturing, and crystal growth fields. With the development of new energy photovoltaic industry, it has become the current polycrystalline silicon ingot furnace and monocrystalline silicon The indispensable heat insulation material for the hot field of the Czochralski furnace has att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/74D04H17/00D04H1/46D04H18/00E04B1/80D01F9/22D04H18/02
CPCY02B80/12Y02A30/242Y02B80/10
Inventor 周文蔚周振国魏万文
Owner SHANGHAI DINGYI INDAL