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Method for preparing charcoal/charcoal-silicon carbide material used for magnetic suspension train slide

A magnetic levitation train and silicon carbide technology, which is applied in the field of carbon/carbon-silicon carbide composite material preparation, can solve the problems of high production cost and achieve the effects of reducing production cost, improving uniformity, and increasing interlayer shear strength

Inactive Publication Date: 2008-08-13
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] C / C composite material is also an ideal material for maglev train skids. Chinese invention patent CN1647875 discloses a method for preparing C / C maglev train skids by chemical vapor deposition (Chemical Vapor Infiltration, CVI) and impregnated carbonization. But its process cycle needs more than 500 hours, and the production cost is high

Method used

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  • Method for preparing charcoal/charcoal-silicon carbide material used for magnetic suspension train slide

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Embodiment 1

[0022] A maglev train skid C / C-SiC composite toughened by carbon fiber mat with a size of 114mm×72mm×32mm was prepared. The preparation process is as follows: T700 carbon fiber non-weft cloth and mesh tire are needle-punched into a whole carbon felt with a density of 0.58g / cm 3 ; The whole carbon felt is subjected to high temperature heat treatment at 1800 ℃, and Ar gas is used as the protective gas; at the deposition temperature of 1100 ℃, the carbon source gas is propylene CH 4 , the diluent is H 2 , CH 4 :H 2 Under the condition of a volume ratio of 1:2, the pyrolytic carbon-densified carbon fiber felt was deposited by the CVI process to make the density reach 1.42g / cm 3 About; put the C / C body in a high-temperature furnace under the protection of Ar gas for high-temperature heat treatment at 2000°C, and keep it warm for 2 hours; add Si powder according to 1.2 times the theoretical required Si amount, the particle size of Si powder is 0.01-0.1mm, and Si powder Place the...

Embodiment 2

[0024] Needle-punched T300 carbon fiber non-weft cloth and mesh tire into a whole carbon felt with a density of 0.4g / cm 3 ; The whole carbon felt is subjected to high temperature heat treatment at 2100 ° C, using Ar gas as the protective gas; at a deposition temperature of 900 ° C, the carbon source gas is propylene C 3 h 6 , the diluent gas is N 2 , C 3 h 6 :N 2 Under the condition of a volume ratio of 1:3, the pyrolytic carbon-densified carbon fiber felt is deposited by the CVI process, and the density reaches about 1.5g / cm3; , keep warm for 2 hours; add Si powder according to 1.3 times the amount of theoretically required Si, put Si powder and C / C green body in a graphite crucible; put Si powder and C / C green body in a graphite crucible into a high-temperature furnace Inside, immerse silicon at 1650°C under negative pressure and keep it warm for 1 hour to prepare a magnetic levitation skid C / C-SiC composite material with a material density of 2.0g / cm 3 , the compressi...

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Abstract

The present invention provides a method for preparing a carbon / carbon-silicon carbide material used by the skid of the magnetic suspending train, which comprises the following procedures in sequence: when the weftless fabric and the ply tire distance-alternating laminate are needled to the quasi-three dimensional carbon fiber whole felt with density 0.4-0.58g / cm<3>, executing a high-temperature treatment with temperature 1800 DEG C-2300 DEG C, executing pyrolytic carbon densification with an equal-temperature CVI or thermal gradient CVI method to prepare a porous C / C base substrate with density 1.4-1.5g / cm<3>, under the protective atmosphere executign 2000 DEG C-2300 DEG C high-temperature treatment to the base substrate, and executing non-immersing orienting fusing Si imbibition at 1500 DEG C to 1650 DEG C. The invention settles the problem that the C / C-SiC magnetic suspending skid prepared by the two-dimensional carbon cloth laminated layer is easily layered and beaked off and disabled, the production period is far lower than that in the method that the C / C magnetic suspending skid is prepared by CVI and impregnation charring, the production technique is simple and the production cost is low.

Description

technical field [0001] The invention relates to a method for preparing a carbon / carbon-silicon carbide (C / C-SiC) composite material, in particular to a carbon / carbon-silicon carbide (C / C-SiC) composite material used in a maglev train skid Preparation. Background technique [0002] Maglev train is a new type of high-speed transportation, with a maximum speed of 500km per hour. As the supporting part of the maglev train when it is parked, emergency braked and towed, the skid is a key component for carrying the maglev train, which requires sufficient strength and extremely low wear rate on the track. The maglev train skid imported from Germany in my country is a carbon cloth reinforced carbon / carbon-silicon carbide composite material with an apparent density of about 1.67g / cm 3 , the fabric structure is carbon cloth laminated, the single-layer carbon cloth thickness is 100-200 μm, the matrix is ​​resin carbon and silicon carbide, the distribution of silicon carbide is relativ...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/52C04B35/565C04B35/622
Inventor 肖鹏熊翔张红波左劲旅
Owner CENT SOUTH UNIV
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