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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 4: 677 - 680

DOI: https://doi.org/10.3724/SP.J.1077.2007.00677

Research Paper

Influence of Gas Residence Time on Properties of C/C Composits Prepared by Microwave Pyrolysis CVI

  • ZOU Ji-Zhao ,
  • ZENG Xie-Rong ,
  • XIONG Xin-Bo ,
  • XIE Sheng-Hui ,
  • TANG Han-Ling ,
  • LI Long
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  • 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China; 2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China; 3. Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China

Received date: 2006-08-24

  Revised date: 2006-10-19

  Online published: 2007-07-20

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Abstract

The infiltration of carbon fiber preforms was studied by microwave pyrolysis chemical vapor infiltration technique, CH4
as the carbon source gas, and N2 as diluent gas, at 1100℃ and methane partial pressure of 10kPa with residence time of 0.05,0.1,0.15 and 0.2s, respectively. The textures of samples were observed, the densification rules of microwave pyrolysis CVI were analyzed by densification rate and radial--direction density distribution with different residence time. Results show that carbon fiber preforms can be densified from inside to outside at 1100℃ for 90h, with gas residence time of 0.15s, the carbon/carbon composite has a higher bulk density of 1.70g·cm-3. Simultaneously, polariscope images show that the textures of the pyrocarbon change from low-textured to medium-textured with the extending of residence time.

Key words： carbon/carbon composites; microwave pyrolysis CVI; residence time; densification

Cite this article

ZOU Ji-Zhao , ZENG Xie-Rong , XIONG Xin-Bo , XIE Sheng-Hui , TANG Han-Ling , LI Long . Influence of Gas Residence Time on Properties of C/C Composits Prepared by Microwave Pyrolysis CVI[J]. Journal of Inorganic Materials, 2007 , 22(4) : 677 -680 . DOI: 10.3724/SP.J.1077.2007.00677

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