Method for preparing high-performance carbon/carbon composite material with short period and low cost
A carbon composite material and a composite material technology, which is applied in the field of carbon fiber composite material preparation, can solve the problems of long preparation process cycle, high cost, difficulty in preparing large-sized and high-density C/C composite materials, etc., so as to improve the mechanical properties. , the effect of shortening the preparation cycle
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[0032] (1) Preparation of interface layer
[0033] Using the CVI process, the carbon fiber prefabricated body is placed in an ICVI furnace to prepare the interface layer, and the thickness of the interface layer ranges from 0.3 to 2 μm.
[0034] (2) Preparation of low-density C / C composite materials
[0035] Using the E-CVI process, the carbon fiber prefabricated body containing the interface layer is placed in an E-CVI furnace with a water wall to deposit a pyrolytic carbon matrix to obtain a low-density C / C composite material, and the overall density is controlled at 0.8-1.6g / cm 3 between;
[0036] (3) Preparation of high-performance, high-density C / C composites
[0037] Using the PIC process, the low-density C / C composite material obtained in step 2 is placed in a vacuum pressure vessel, and the resin is introduced into the material matrix obtained in step 2 by using a vacuum environment, and undergoes vacuum-pressure impregnation, low-temperature drying, cross-linking ...
Embodiment 1
[0047] Take 400×100×15mm as an example, the density is 0.5g / cm 3 2D needle felt; Pyrolytic carbon interface layer prepared by ICVI process, temperature 900°C, argon flow rate 0.2m 3 / h, propane 0.15m 3 / h, the deposition time is 5 hours; the low-density C / C composite material is prepared by E-CVI process, the temperature is 700-1000°C, and the flow rate of argon gas is 0.2m 3 / h, propane 0.15m 3 / h, deposition time 20 hours, prepared material density 1.65g / cm 3 ;The PIC process is used to prepare high-performance and high-density C / C composite materials. After 8 cycles of dipping and cracking, after 2 times of 2000°C and 2h high-temperature heat treatment, the specific process parameters of dipping and cracking are: vacuum degree -0.1MPa, impregnation pressure 5MPa , Curing temperature 170°C, carbonization cracking temperature 1000°C, heat preservation 1h, material final density 1.90g / cm 3 , The total material preparation cycle is 350 hours. figure 2 It is the microstru...
Embodiment 2
[0049] Take 400×100×25mm as an example, the density is 0.5g / cm 3 2D needle felt; Pyrolytic carbon interface layer prepared by ICVI process, temperature 900°C, argon flow rate 0.2m 3 / h, propane 0.15m 3 / h, the deposition time is 5 hours; the low-density C / C composite material is prepared by E-CVI process, the temperature is 700-1000°C, and the flow rate of argon gas is 0.2m 3 / h, propane 0.15m 3 / h, deposition time 30 hours, prepared material density 1.55g / cm 3 ;The PIC process is used to prepare high-performance and high-density C / C composite materials. After 8 cycles of impregnation and cracking, after 2 times of 2000℃-2h high-temperature heat treatment, the specific process parameters of impregnation and cracking are: vacuum degree -0.1MPa, impregnation pressure 5MPa , Curing temperature 170°C, carbonization cracking temperature 1000°C, heat preservation 1h, material final density 1.85g / cm 3 , The total material preparation cycle is 400 hours. image 3 It is the mecha...
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