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Method for producing carbon/carbon skid of magnetic suspension train

A technology for maglev trains and manufacturing methods, which is applied in the field of manufacturing carbon/carbon composite materials for maglev train skids, can solve the problems of skid function failure, small thermal conductivity, and low interlayer shear strength, and achieve improved interlayer Effects of shear strength, improvement of wear resistance, improvement of interlayer shear strength and thermal conductivity

Inactive Publication Date: 2005-08-03
XIAN AEROSPACE COMPOSITE MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: there is no reinforced carbon fiber in the thickness direction of the skid carbon / carbon, the thermal conductivity is small, the interlayer shear strength is low, and delamination defects are prone to occur during use, resulting in the failure of the skid function

Method used

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  • Method for producing carbon/carbon skid of magnetic suspension train
  • Method for producing carbon/carbon skid of magnetic suspension train

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Acupuncture carbon cloth and carbon fiber composite structure quasi-three-dimensional structure preform is used. The thickness of the acupuncture carbon cloth is 2-4mm, and the remaining thickness is acupuncture long fibers. In the preform, long carbon fibers and mesh short fibers are used. The weight percentage is about 75%: 25%.

[0025] (2) The preform is loaded into the negative pressure directional flow gas phase carbon deposition furnace, and the isothermal CVI densification process is adopted. The temperature is 1000 ° C, the pressure in the furnace is 10 KPa, and the carbon source gas (C 3 H 6 ) at a flow rate of 100 L / h, and after 300 hours of densification treatment, a pyrolytic carbon matrix was formed.

[0026] (3) The porous carbon / carbon body is impregnated in a vacuum-pressure impregnation tank, and the weight of the furfurone resin is 120kg, and the SiC ultrafine powder with a weight percentage of 6kg (5% of the furfurone resin) is added, and the ne...

Embodiment 2

[0030] (1) Acupuncture carbon cloth and carbon fiber composite structure quasi-three-dimensional structure preform is used. The acupuncture carbon cloth and fiber mesh are alternately laminated, with a thickness of 6-8mm, and the remaining thickness is acupuncture long fiber and fiber mesh. The tires are alternately laminated, the thickness is 25mm, and the weight percentage of the long carbon fibers and the short fibers of the mesh tire in the preform is 78%: 22%.

[0031] (2) The preform is loaded into the negative pressure directional flow gas phase carbon deposition furnace, and the isothermal CVI densification process is adopted. The temperature is 900-1100 ° C, the pressure in the furnace is 5KPa, and the carbon source gas (C 3 H 6 ) at a flow rate of 2000 L / h, and after 500 hours of densification treatment, a pyrolytic carbon matrix was formed.

[0032] (3) Put the porous carbon / carbon body in a vacuum-pressure impregnation tank, the furfurone resin weighs 100kg, and a...

Embodiment 3

[0036] (1) Acupuncture carbon cloth and carbon fiber composite structure quasi-three-dimensional structure preform is used. The acupuncture carbon cloth and fiber mesh are alternately laminated. The thickness is 8-10mm, and the rest is acupuncture long fiber and fiber mesh. The tires are alternately laminated, and the thickness is 30 mm. The weight percentage of long carbon fibers and short fibers of the mesh tire in the preform is about 85%: 15%.

[0037] (2) The preform is loaded into the negative pressure directional flow gas phase carbon deposition furnace, and the isothermal CVI densification process is adopted. The temperature is 950-1200 ° C, the pressure in the furnace is 5KPa, and the carbon source gas (C 3 H 6 ) at a flow rate of 3000L / h, and after 300-500 hours of densification treatment, a pyrolytic carbon matrix is ​​formed.

[0038] (3) The porous carbon / carbon body was impregnated with 80 kg of furfurone resin in a vacuum-pressure impregnation tank, and 4% by w...

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Abstract

The production of carbon / carbon skid for magnetic suspension train includes needle punching process of preparing quasi-3D prefabricated body of carbon cloth and carbon fiber and isothermal CVI densifying process of the prefabricated body inside negative pressure directional flow vapor carbon depositing furnace to form pyrolytic carbon base body; soaking with furfural acetone resin or phenolic resin with superfine SiC, Al2O3 or ZrO2 powder added inside a vacuum-pressure soaking tank; curing, carbonizing and high temperature processing to form the modified binary carbon base skid material. The present invention has high interlayer shearing strength and heat conducting coefficient, excellent wear resistance and low production cost and is suitable for industrial production.

Description

Technical field [0001] The invention relates to a manufacturing method of a carbon / carbon composite material for a maglev train skid. Background technique [0002] Maglev traffic is still a new technology in the world, and the maximum operating speed is 500km / h. Maglev trains don't have wheels, instead they have pairs of skids. When the train brakes urgently during operation, or needs to be towed to the repair site due to vehicle failure, the skid supports the train to slide on the track without wearing down the track. To this end, the skid is a key component of the maglev train. At present, the maglev train skid introduced in my country is made of two-dimensional carbon cloth reinforced resin carbon composite material produced in Germany. The disadvantages are: the carbon fiber skid / carbon has no reinforced carbon fibers in the thickness direction, the thermal conductivity is small, the interlayer shear strength is low, and delamination defects are prone to occur during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04
Inventor 苏红邓红兵程文苏君明张晓虎崔红姚冬梅吴大云南登茂闫联生郑金煌赵景鹏
Owner XIAN AEROSPACE COMPOSITE MATERIALS INST
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