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A platform for research: civil engineering, architecture and urbanism
Carbon fiber preform, preparation method and application thereof, and carbon/carbon composite material
The invention belongs to the technical field of preparation of carbon fiber preforms, and provides a carbon fiber preform, a preparation method and application thereof, and a carbon/carbon composite material. The graphene paper is adopted to replace carbon cloth in the carbon fiber preform, and the heat conductivity coefficient of graphene is higher than that of carbon fiber, so that the first structural unit of the graphene paper and the nearby second structural unit have higher temperature in the chemical vapor infiltration process, and a thermal gradient is formed in the carbon fiber preform. In the chemical vapor infiltration process, precursor gas diffuses from the low-temperature surface of the carbon fiber preform to the high-temperature part, under the action of the temperature, the precursor gas quickly deposits at the high-temperature part to form pyrolytic carbon, and at the moment, the pyrolytic carbon deposits at the low-temperature part at a low speed. And along with the reduction of the porosity of the high-temperature part, the heat conduction capability is further improved, so that the deposition area is pushed from the high-temperature part to the low-temperature surface until the densification of the carbon fiber preform is completed, and the problem of pore closing in the densification process of the carbon fiber preform is effectively solved.
本发明属于碳纤维预制体制备技术领域，提供了碳纤维预制体及其制备方法与应用、碳/碳复合材料。本发明在碳纤维预制体中采用石墨烯纸代替碳布，由于石墨烯的导热系数高于碳纤维，所以有着石墨烯纸的第一结构单元和附近的第二结构单元在化学气相渗透过程中有着更高的温度，这样就在碳纤维预制体中形成了热梯度。在化学气相渗透过程中，前驱体气体从碳纤维预制体低温表面向高温部位扩散，在温度的作用下，在高温部位快速沉积形成热解碳，此时的低温部位以比较低的速率沉积热解碳。随着高温部位孔隙率减小，导热能力进一步增加，于是沉积区域由高温部位向低温表面推移，直至完成碳纤维预制体的致密化，有效解决了碳纤维预制体致密化过程中闭孔问题。
Carbon fiber preform, preparation method and application thereof, and carbon/carbon composite material
The invention belongs to the technical field of preparation of carbon fiber preforms, and provides a carbon fiber preform, a preparation method and application thereof, and a carbon/carbon composite material. The graphene paper is adopted to replace carbon cloth in the carbon fiber preform, and the heat conductivity coefficient of graphene is higher than that of carbon fiber, so that the first structural unit of the graphene paper and the nearby second structural unit have higher temperature in the chemical vapor infiltration process, and a thermal gradient is formed in the carbon fiber preform. In the chemical vapor infiltration process, precursor gas diffuses from the low-temperature surface of the carbon fiber preform to the high-temperature part, under the action of the temperature, the precursor gas quickly deposits at the high-temperature part to form pyrolytic carbon, and at the moment, the pyrolytic carbon deposits at the low-temperature part at a low speed. And along with the reduction of the porosity of the high-temperature part, the heat conduction capability is further improved, so that the deposition area is pushed from the high-temperature part to the low-temperature surface until the densification of the carbon fiber preform is completed, and the problem of pore closing in the densification process of the carbon fiber preform is effectively solved.
本发明属于碳纤维预制体制备技术领域，提供了碳纤维预制体及其制备方法与应用、碳/碳复合材料。本发明在碳纤维预制体中采用石墨烯纸代替碳布，由于石墨烯的导热系数高于碳纤维，所以有着石墨烯纸的第一结构单元和附近的第二结构单元在化学气相渗透过程中有着更高的温度，这样就在碳纤维预制体中形成了热梯度。在化学气相渗透过程中，前驱体气体从碳纤维预制体低温表面向高温部位扩散，在温度的作用下，在高温部位快速沉积形成热解碳，此时的低温部位以比较低的速率沉积热解碳。随着高温部位孔隙率减小，导热能力进一步增加，于是沉积区域由高温部位向低温表面推移，直至完成碳纤维预制体的致密化，有效解决了碳纤维预制体致密化过程中闭孔问题。
Carbon fiber preform, preparation method and application thereof, and carbon/carbon composite material
一种碳纤维预制体及其制备方法与应用、碳/碳复合材料
LI AIJUN (author) / MAO SIJIA (author) / JIA LINTAO (author) / WANG MENGQIAN (author) / GUO XIAOFENG (author) / ZHANG DAN (author)
2021-08-20
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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